@article{ISI:000340579900011,
author = {Stefanak, Martin and Bezdekova, Iva and Jex, Igor and Barnett, Stephen
M.},
title = {{STABILITY OF POINT SPECTRUM FOR THREE-STATE QUANTUM WALKS ON A LINE}},
journal = {{QUANTUM INFORMATION \& COMPUTATION}},
year = {{2014}},
volume = {{14}},
number = {{13-14}},
pages = {{1213-1226}},
month = {{OCT}},
abstract = {{Evolution operators of certain quantum walks possess, apart from the
continuous part, also a point spectrum. The existence of eigenvalues and
the corresponding stationary states lead to partial trapping of the
walker in the vicinity of the origin. We analyze the stability of this
feature for three-state quantum walks on a line subject to homogenous
coin deformations. We find two classes of coin operators that preserve
the point spectrum. These new classes of coins are generalizations of
coins found previously by different methods and shed light on the rich
spectrum of coins that can drive discrete-time quantum walks.}},
publisher = {{RINTON PRESS, INC}},
address = {{565 EDMUND TERRACE, PARAMUS, NJ 07652 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Brehova, Czech Republic.
Stefanak, Martin; Bezdekova, Iva; Jex, Igor, Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Brehova, Czech Republic.
Barnett, Stephen M., Univ Glasgow, Sch Phys \& Astron, Glasgow G12 8QQ, Lanark, Scotland.}},
issn = {{1533-7146}},
keywords = {{quantum walk; localization}},
keywords-plus = {{LOCALIZATION}},
research-areas = {{Computer Science; Physics}},
web-of-science-categories = {{Computer Science, Theory \& Methods; Physics, Particles \& Fields;
Physics, Mathematical}},
researcherid-numbers = {{Stefanak, Martin/G-5239-2012}},
funding-acknowledgement = {{RVO {[}68407700, SGS13/217/OHK4/3T/14]; GAR {[}13-33906S]; GACR
{[}14-02901P]}},
funding-text = {{The financial support from RVO 68407700, SGS13/217/OHK4/3T/14, GAR
13-33906S and GACR 14-02901P is gratefully acknowledged.}},
number-of-cited-references = {{25}},
times-cited = {{1}},
journal-iso = {{Quantum Inform. Comput.}},
doc-delivery-number = {{AN4SX}},
unique-id = {{ISI:000340579900011}}
}
@article{ISI:000341115200006,
author = {Hamilton, Craig S. and Kruse, Regina and Sansoni, Linda and Silberhorn,
Christine and Jex, Igor},
title = {{Driven Quantum Walks}},
journal = {{PHYSICAL REVIEW LETTERS}},
year = {{2014}},
volume = {{113}},
number = {{8}},
month = {{AUG 21}},
abstract = {{We introduce the concept of a driven quantum walk. This work is
motivated by recent theoretical and experimental progress that combines
quantum walks and parametric down-conversion, leading to fundamentally
different phenomena. We compare these striking differences by relating
the driven quantum walks to the original quantum walk. Next, we
illustrate typical dynamics of such systems and show that these walks
can be controlled by various pump configurations and phase matchings.
Finally, we end by proposing an application of this process based on a
quantum search algorithm that performs faster than a classical search.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Hamilton, CS (Reprint Author), Czech Tech Univ, FNSPE, Brehova 7, Prague 11519 1, Czech Republic.
Hamilton, Craig S.; Jex, Igor, Czech Tech Univ, FNSPE, Prague 11519 1, Czech Republic.
Kruse, Regina; Sansoni, Linda; Silberhorn, Christine, Univ Paderborn, D-33098 Paderborn, Germany.}},
doi = {{10.1103/PhysRevLett.113.083602}},
article-number = {{083602}},
issn = {{0031-9007}},
eissn = {{1079-7114}},
keywords-plus = {{SIMULATION; TREES}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{hamilcra@fjfi.cvut.cz}},
funding-acknowledgement = {{ {[}RVO 68407700]; {[}GACR 13-33906 S]}},
funding-text = {{C. S. H. and I. J. received financial support from Grants No. RVO
68407700 and No. GACR 13-33906 S.}},
number-of-cited-references = {{32}},
times-cited = {{0}},
journal-iso = {{Phys. Rev. Lett.}},
doc-delivery-number = {{AO1ZV}},
unique-id = {{ISI:000341115200006}}
}
@article{ISI:000341232500003,
author = {Stefanak, M. and Bezdekova, I. and Jex, I.},
title = {{Limit distributions of three-state quantum walks: The role of coin
eigenstates}},
journal = {{PHYSICAL REVIEW A}},
year = {{2014}},
volume = {{90}},
number = {{1}},
month = {{JUL 31}},
abstract = {{We analyze two families of three-state quantum walks which show the
localization effect. We focus on the role of the initial coin state and
its coherence in controlling the properties of the quantum walk. In
particular, we show that the description of the walk simplifies
considerably when the initial coin state is decomposed in the basis
formed by the eigenvectors of the coin operator. This allows us to
express the limit distributions in a much more convenient form.
Consequently, striking features which are hidden in the standard basis
description are easily identified. Moreover, the dependence of moments
of the position distribution on the initial coin state can be analyzed
in full detail. In particular, we find that in the eigenvector basis the
even moments and the localization probability at the origin depend only
on incoherent combination of probabilities. In contrast, odd moments and
localization outside the origin are affected by the coherence of the
initial coin state.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague 1, Stare Mesto, Czech Republic.
Stefanak, M.; Bezdekova, I.; Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Stare Mesto, Czech Republic.}},
doi = {{10.1103/PhysRevA.90.012342}},
article-number = {{012342}},
issn = {{1050-2947}},
eissn = {{1094-1622}},
keywords-plus = {{ONE-DIMENSION; LOCALIZATION}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
author-email = {{martin.stefanak@fjfi.cvut.cz}},
researcherid-numbers = {{Stefanak, Martin/G-5239-2012}},
funding-acknowledgement = {{{[}RVO 68407700]; {[}GACR 14-02901P]; {[}SGS13/217/OHK4/3T/14];
{[}GACR 13-33906S]}},
funding-text = {{We appreciate the financial support from Grant No. RVO 68407700. M.S..
is grateful for Grant No. GACR 14-02901P. I.B. and I.J. are thankful for
the financial support from Grants No. SGS13/217/OHK4/3T/14 and No. GACR
13-33906S.}},
number-of-cited-references = {{38}},
times-cited = {{0}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{AO3LY}},
unique-id = {{ISI:000341232500003}}
}
@article{ISI:000336809800001,
author = {Kollar, Balint and Novotny, Jaroslav and Kiss, Tamas and Jex, Igor},
title = {{Discrete time quantum walks on percolation graphs}},
journal = {{EUROPEAN PHYSICAL JOURNAL PLUS}},
year = {{2014}},
volume = {{129}},
number = {{5}},
month = {{MAY 30}},
abstract = {{Randomly breaking connections in a graph alters its transport
properties, a model used to describe percolation. In the case of quantum
walks, dynamic percolation graphs represent a special type of
imperfections, where the connections appear and disappear randomly in
each step during the time evolution. The resulting open system dynamics
is hard to treat numerically in general. We shortly review the
literature on this problem. We then present our method to solve the
evolution on finite percolation graphs in the long time limit, applying
the asymptotic methods concerning random unitary maps. We work out the
case of one-dimensional chains in detail and provide a concrete,
step-by-step numerical example in order to give more insight into the
possible asymptotic behavior. The results about the case of the
two-dimensional integer lattice are summarized, focusing on the
Grover-type coin operator.}},
publisher = {{SPRINGER HEIDELBERG}},
address = {{TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY}},
type = {{Article}},
language = {{English}},
affiliation = {{Kollar, B (Reprint Author), SZFKI, Wigner RCP, Konkoly Thege M U 29-33, H-1121 Budapest, Hungary.
Kollar, Balint; Kiss, Tamas, SZFKI, Wigner RCP, H-1121 Budapest, Hungary.
Novotny, Jaroslav; Jex, Igor, Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Stare Mesto, Czech Republic.}},
doi = {{10.1140/epjp/i2014-14103-6}},
article-number = {{103}},
issn = {{2190-5444}},
keywords-plus = {{DECOHERENCE; DYNAMICS; PHOTONS}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{kollar.balint@wigner.mta.hu}},
funding-acknowledgement = {{Hungarian Scientific Research Fund (OTKA) {[}K83858, NN109651];
Hungarian Academy of Sciences (Lendulet Program) {[}LP2011-016];
{[}GACR 13-33906S]; {[}RVO 68407700]}},
funding-text = {{We acknowledge support by GACR 13-33906S, RVO 68407700, the Hungarian
Scientific Research Fund (OTKA) under Contract Nos. K83858, NN109651,
the Hungarian Academy of Sciences (Lendulet Program, LP2011-016).}},
number-of-cited-references = {{65}},
times-cited = {{0}},
journal-iso = {{Eur. Phys. J. Plus}},
doc-delivery-number = {{AI4BG}},
unique-id = {{ISI:000336809800001}}
}
@article{ISI:000332612000002,
author = {Kollar, B. and Novotny, J. and Kiss, T. and Jex, I.},
title = {{Percolation induced effects in two-dimensional coined quantum walks:
analytic asymptotic solutions}},
journal = {{NEW JOURNAL OF PHYSICS}},
year = {{2014}},
volume = {{16}},
month = {{FEB 4}},
abstract = {{Quantum walks on graphs can model physical processes and serve as
efficient tools in quantum information theory. Once we admit random
variations in the connectivity of the underlying graph, we arrive at the
problem of percolation, where the long-time behaviour appears
untreatable with direct numerical methods. We develop novel analytic
methods based on the theory of random unitary operations which help us
to determine explicitly the asymptotic dynamics of quantum walks on
two-dimensional finite integer lattices with percolation. Based on this
theory, we find new unexpected features of percolated walks like
asymptotic position inhomogeneity or special directional symmetry
breaking.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Kollar, B (Reprint Author), SZFKI, Wigner RCP, Konkoly Thege Miklos Ut 29-33, H-1121 Budapest, Hungary.
Kollar, B.; Kiss, T., SZFKI, Wigner RCP, H-1121 Budapest, Hungary.
Kollar, B., Univ Pecs, Inst Phys, H-7624 Pecs, Hungary.
Novotny, J.; Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Stare Mesto, Czech Republic.}},
doi = {{10.1088/1367-2630/16/2/023002}},
article-number = {{23002}},
issn = {{1367-2630}},
keywords-plus = {{DECOHERENCE; DYNAMICS; PHOTONS}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{kollar.balint@wigner.mta.hu}},
researcherid-numbers = {{Kollar, Balint/J-2297-2012
Kiss, Tamas/B-9228-2009}},
funding-acknowledgement = {{MSM {[}6840770039]; GACR {[}13-33906S]; RVO {[}68407700]; Hungarian
Scientific Research Fund (OTKA) {[}K83858, NN109651]; Hungarian Academy
of Sciences (Lendulet Program) {[}LP2011-016]; European Union; State of
Hungary; European Social Fund {[}TAMOP 4.2.4.A/2-11-1-2012-0001]}},
funding-text = {{We acknowledge support by MSM 6840770039, GACR 13-33906S, RVO 68407700,
the Hungarian Scientific Research Fund (OTKA) under contract numbers
K83858, NN109651, the Hungarian Academy of Sciences (Lendulet Program,
LP2011-016). BK acknowledges support by the European Union and the State
of Hungary, co-financed by the European Social Fund in the framework of
TAMOP 4.2.4.A/2-11-1-2012-0001 `National Excellence Program'.}},
number-of-cited-references = {{48}},
times-cited = {{1}},
journal-iso = {{New J. Phys.}},
doc-delivery-number = {{AC6DQ}},
unique-id = {{ISI:000332612000002}}
}
@article{ISI:000323480500001,
author = {Kruse, R. and Katzschmann, F. and Christ, A. and Schreiber, A. and
Wilhelm, S. and Laiho, K. and Gabris, A. and Hamilton, C. S. and Jex, I.
and Silberhorn, C.},
title = {{Spatio-spectral characteristics of parametric down-conversion in
waveguide arrays}},
journal = {{NEW JOURNAL OF PHYSICS}},
year = {{2013}},
volume = {{15}},
month = {{AUG 23}},
abstract = {{High dimensional quantum states are of fundamental interest for quantum
information processing. They give access to large Hilbert spaces and, in
turn, enable the encoding of quantum information on multiple modes. One
method to create such quantum states is parametric down-conversion (PDC)
in waveguide arrays (WGAs) which allows for the creation of highly
entangled photon pairs in controlled, easily accessible spatial modes,
with unique spectral properties.
In this paper we examine both theoretically and experimentally the PDC
process in a lithium niobate WGA. We measure the spatial and spectral
properties of the emitted photon pairs, revealing correlations between
spectral and spatial degrees of freedom of the created photons. Our
measurements show that, in contrast to prior theoretical approaches,
spectrally dependent coupling effects have to be taken into account in
the theory of PDC in WGAs. To interpret the results, we developed a
theoretical model specifically taking into account spectrally dependent
coupling effects, which further enables us to explore the capabilities
and limitations for engineering the spatial correlations of the
generated quantum states.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Kruse, R (Reprint Author), Univ Paderborn, Warburger Str 100, D-33098 Paderborn, Germany.
Kruse, R.; Katzschmann, F.; Christ, A.; Schreiber, A.; Wilhelm, S.; Laiho, K.; Silberhorn, C., Univ Paderborn, D-33098 Paderborn, Germany.
Schreiber, A.; Silberhorn, C., Max Planck Inst Sci Light, D-91058 Erlangen, Germany.
Laiho, K., Univ Innsbruck, Inst Expt Phys Photon, A-6020 Innsbruck, Austria.
Gabris, A.; Hamilton, C. S.; Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Czech Republic.
Gabris, A., Hungarian Acad Sci, Wigner Res Ctr Phys, H-1525 Budapest, Hungary.}},
doi = {{10.1088/1367-2630/15/8/083046}},
article-number = {{083046}},
issn = {{1367-2630}},
keywords-plus = {{ENTANGLED PHOTON PAIRS; LITHIUM-NIOBATE; DIRECTIONAL-COUPLERS;
INTERFERENCE; INFORMATION; GENERATION; SOLITONS; OPTICS; PUMP}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{rkruse2@mail.upb.de}},
funding-acknowledgement = {{MSM {[}6840770039]; RVO {[}68407700]; GACR {[}13-33906S]; National
Research Fund of Hungary {[}T83858]}},
funding-text = {{The authors thank Harald Herrmann and Hubertus Suche for useful
discussions and helpful comments. The authors further thank Frank
Setzpfandt and Thomas Pertsch for discussions concerning the
experimental setup. AG, CSH and IJ received funding from MSM 6840770039,
RVO 68407700 and GACR 13-33906S. AG acknowledges partial support from
the National Research Fund of Hungary under contract no. T83858.}},
number-of-cited-references = {{48}},
times-cited = {{4}},
journal-iso = {{New J. Phys.}},
doc-delivery-number = {{205YI}},
unique-id = {{ISI:000323480500001}}
}
@article{ISI:000322605800016,
author = {Rohde, Peter P. and Schreiber, Andreas and Stefanak, Martin and Jex,
Igor and Gilchrist, Alexei and Silberhorn, Christine},
title = {{Increasing the Dimensionality of Quantum Walks Using Multiple Walkers}},
journal = {{JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE}},
year = {{2013}},
volume = {{10}},
number = {{7, SI}},
pages = {{1644-1652}},
month = {{JUL}},
abstract = {{We show that with the addition of multiple walkers, quantum walks on a
line can be transformed into lattice graphs of higher dimension. Thus,
multi-walker walks can simulate single-walker walks on higher
dimensional graphs and vice versa. This exponential complexity opens up
new applications for present-day quantum walk experiments. We discuss
the applications of such higher-dimensional structures and how they
relate to linear optics quantum computing. In particular we show that
multi-walker quantum walks are equivalent to the BOSONSAMPLING model for
linear optics quantum computation proposed by Aaronson and Arkhipov.
With the addition of control over phase-defects in the lattice, which
can be simulated with entangling gates, asymmetric lattice structures
can be constructed which are universal for quantum computation.}},
publisher = {{AMER SCIENTIFIC PUBLISHERS}},
address = {{26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Rohde, PP (Reprint Author), Univ Paderborn, Warburger Str 100, D-33098 Paderborn, Germany.
Rohde, Peter P.; Schreiber, Andreas; Silberhorn, Christine, Univ Paderborn, D-33098 Paderborn, Germany.
Rohde, Peter P.; Gilchrist, Alexei, Macquarie Univ, Dept Phys \& Astron, Ctr Engn Quantum Syst, Sydney, NSW 2113, Australia.
Schreiber, Andreas; Silberhorn, Christine, Max Planck Inst Sci Light, D-91058 Erlangen, Germany.
Stefanak, Martin; Jex, Igor, Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Czech Republic.}},
doi = {{10.1166/jctn.2013.3104}},
issn = {{1546-1955}},
keywords = {{Quantum; Walk; Complexity}},
keywords-plus = {{COMPUTATION}},
research-areas = {{Chemistry; Science \& Technology - Other Topics; Materials Science;
Physics}},
web-of-science-categories = {{Chemistry, Multidisciplinary; Nanoscience \& Nanotechnology; Materials
Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter}},
researcherid-numbers = {{Stefanak, Martin/G-5239-2012
Silberhorn, Christine/J-4919-2013
Gilchrist, Alexei/B-9968-2009}},
orcid-numbers = {{Silberhorn, Christine/0000-0002-2349-5443
}},
funding-acknowledgement = {{Australian Research Council Centre of Excellence for Engineered Quantum
Systems {[}CE110001013]; Czech Ministry of Education {[}MSM 6840770039];
Doppler Institute, FNSPE CTU in Prague}},
funding-text = {{We thank Timothy Ralph, Scott Aaronson and Aurel Gabris for helpful
discussions. This research was conducted by the Australian Research
Council Centre of Excellence for Engineered Quantum Systems (Project
number CE110001013). We acknowledge support by the grant MSM 6840770039
of the Czech Ministry of Education and the Doppler Institute, FNSPE CTU
in Prague.}},
number-of-cited-references = {{30}},
times-cited = {{1}},
journal-iso = {{J. Comput. Theor. Nanosci.}},
doc-delivery-number = {{194BK}},
unique-id = {{ISI:000322605800016}}
}
@article{ISI:000311337400011,
author = {Novotny, J. and Alber, G. and Jex, I.},
title = {{Asymptotic properties of quantum Markov chains}},
journal = {{JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL}},
year = {{2012}},
volume = {{45}},
number = {{48}},
month = {{DEC 7}},
abstract = {{The asymptotic dynamics of discrete quantum Markov chains generated by
the most general physically relevant quantum operations is investigated.
It is shown that it is confined to an attractor space in which the
resulting quantum Markov chain is diagonalizable. A construction
procedure of a basis of this attractor space and its associated dual
basis of 1-forms is presented. It is applicable whenever a strictly
positive quantum state exists which is contracted or left invariant by
the generating quantum operation. Moreover, algebraic relations between
the attractor space and Kraus operators involved in the definition of a
quantum Markov chain are derived. This construction is not only expected
to offer significant computational advantages in cases in which the
dimension of the Hilbert space is large and the dimension of the
attractor space is small, but it also sheds new light onto the relation
between the asymptotic dynamics of discrete quantum Markov chains and
fixed points of their generating quantum operations. Finally, we show
that without any restriction our construction applies to all initial
states whose support belongs to the so-called recurrent subspace.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Novotny, J (Reprint Author), Czech Tech Univ, Dept Phys, FNSPE, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Novotny, J.; Jex, I., Czech Tech Univ, Dept Phys, FNSPE, Prague 11519 1, Stare Mesto, Czech Republic.
Alber, G., Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.}},
doi = {{10.1088/1751-8113/45/48/485301}},
article-number = {{485301}},
issn = {{1751-8113}},
eissn = {{1751-8121}},
keywords-plus = {{FIXED-POINTS; OPERATIONS; MAPS}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary; Physics, Mathematical}},
author-email = {{novotny.jaroslav@seznam.cz}},
funding-acknowledgement = {{Czech Ministry of Education {[}MSM 6840770039]; Doppler Institute, FNSPE
CTU in Prague; CASED AB1}},
funding-text = {{JN and IJ acknowledge support by the grant MSM 6840770039 of the Czech
Ministry of Education and the Doppler Institute, FNSPE CTU in Prague, GA
acknowledges support by CASED AB1.}},
number-of-cited-references = {{27}},
times-cited = {{2}},
journal-iso = {{J. Phys. A-Math. Theor.}},
doc-delivery-number = {{040QH}},
unique-id = {{ISI:000311337400011}}
}
@article{ISI:000305526600004,
author = {Nikolopoulos, G. M. and Hoskovec, A. and Jex, I.},
title = {{Analysis and minimization of bending losses in discrete quantum networks}},
journal = {{PHYSICAL REVIEW A}},
year = {{2012}},
volume = {{85}},
number = {{6}},
month = {{JUN 21}},
abstract = {{We study theoretically the transfer of quantum information along bends
in two-dimensional discrete lattices. Our analysis shows that the
fidelity of the transfer decreases considerably as a result of
interactions in the neighborhood of the bend. It is also demonstrated
that such losses can be controlled efficiently by the inclusion of a
defect. The present results are of relevance to various physical
implementations of quantum networks, where geometric imperfections with
finite spatial extent may arise as a result of bending, residual stress,
etc.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Nikolopoulos, GM (Reprint Author), FORTH, Inst Elect Struct \& Laser, POB 1527, GR-71110 Iraklion, Greece.
Nikolopoulos, G. M., FORTH, Inst Elect Struct \& Laser, GR-71110 Iraklion, Greece.
Hoskovec, A.; Jex, I., Czech Tech Univ, Dept Phys, FNSPE, Prague 11519 1, Stare Mesto, Czech Republic.}},
doi = {{10.1103/PhysRevA.85.062319}},
article-number = {{062319}},
issn = {{1050-2947}},
keywords-plus = {{ELECTRON WAVEPACKET PROPAGATION; STATE TRANSFER; DOTS; ENTANGLEMENT;
DYNAMICS; PERFECT; SYSTEMS; CHAIN}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Nikolopoulos, Georgios/H-3023-2011}},
orcid-numbers = {{Nikolopoulos, Georgios/0000-0002-3937-2771}},
funding-acknowledgement = {{Czech Ministry of Education {[}3132MSM6840770039]; Czech Technical
University in Prague {[}SGS10/294/OHK4/3T/14]; DI FNSPE CTU in Prague}},
funding-text = {{We acknowledge support from Grants No. 3132MSM6840770039 of the Czech
Ministry of Education, No. SGS10/294/OHK4/3T/14 of the Czech Technical
University in Prague, and the DI FNSPE CTU in Prague.}},
number-of-cited-references = {{34}},
times-cited = {{2}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{962FK}},
unique-id = {{ISI:000305526600004}}
}
@article{ISI:000304806100003,
author = {Kollar, B. and Kiss, T. and Novotny, J. and Jex, I.},
title = {{Asymptotic Dynamics of Coined Quantum Walks on Percolation Graphs}},
journal = {{PHYSICAL REVIEW LETTERS}},
year = {{2012}},
volume = {{108}},
number = {{23}},
month = {{JUN 5}},
abstract = {{Quantum walks obey unitary dynamics: they form closed quantum systems.
The system becomes open if the walk suffers from imperfections
represented as missing links on the underlying basic graph structure,
described by dynamical percolation. Openness of the system's dynamics
creates decoherence, leading to strong mixing. We present a method to
analytically solve the asymptotic dynamics of coined, percolated quantum
walks for a general graph structure. For the case of a circle and a
linear graph we derive the explicit form of the asymptotic states. We
find that a rich variety of asymptotic evolutions occur: not only the
fully mixed state, but other stationary states; stable periodic and
quasiperiodic oscillations can emerge, depending on the coin operator,
the initial state, and the topology of the underlying graph.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Kollar, B (Reprint Author), SZFKI, WIGNER RCP, Konkoly Thege Miklos Ut 29-33, H-1121 Budapest, Hungary.
Kollar, B.; Kiss, T., SZFKI, WIGNER RCP, H-1121 Budapest, Hungary.
Novotny, J.; Jex, I., Czech Tech Univ, Dept Phys, Fac Nucl Sci \& Phys Engn, Prague 11519 1, Stare Mesto, Czech Republic.}},
doi = {{10.1103/PhysRevLett.108.230505}},
article-number = {{230505}},
issn = {{0031-9007}},
keywords-plus = {{DECOHERENCE}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Kollar, Balint/J-2297-2012}},
funding-acknowledgement = {{MSM {[}6840770039]; DI FNSPE CTU in Prague; Hungarian Scientific
Research Fund (OTKA) {[}K83858]; Hungarian Academy of Sciences
{[}LP2011-016]}},
funding-text = {{We acknowledge support by MSM 6840770039, DI FNSPE CTU in Prague, the
Hungarian Scientific Research Fund (OTKA) under Contract No. K83858, and
the Hungarian Academy of Sciences (Lendulet Program, LP2011-016).}},
number-of-cited-references = {{31}},
times-cited = {{9}},
journal-iso = {{Phys. Rev. Lett.}},
doc-delivery-number = {{952QB}},
unique-id = {{ISI:000304806100003}}
}
@article{ISI:000305245400032,
author = {Stefanak, M. and Bezdekova, I. and Jex, I.},
title = {{Continuous deformations of the Grover walk preserving localization}},
journal = {{EUROPEAN PHYSICAL JOURNAL D}},
year = {{2012}},
volume = {{66}},
number = {{5}},
month = {{MAY}},
abstract = {{The three-state Grover walk on a line exhibits the localization effect
characterized by a non-vanishing probability of the particle to stay at
the origin. We present two continuous deformations of the Grover walk
which preserve its localization nature. The resulting quantum walks
differ in the rate at which they spread through the lattice. The
velocities of the left and right-traveling probability peaks are given
by the maximum of the group velocity. We find the explicit form of peak
velocities in dependence on the coin parameter. Our results show that
localization of the quantum walk is not a singular property of an
isolated coin operator but can be found for entire families of coins.}},
publisher = {{SPRINGER}},
address = {{233 SPRING ST, NEW YORK, NY 10013 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague 1, Stare Mesto, Czech Republic.
Stefanak, M.; Bezdekova, I.; Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Stare Mesto, Czech Republic.}},
doi = {{10.1140/epjd/e2012-30146-9}},
article-number = {{142}},
issn = {{1434-6060}},
keywords-plus = {{QUANTUM RANDOM-WALKS; LIMIT-THEOREMS; ONE-DIMENSION}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
author-email = {{martin.stefanak@fjfi.cvut.cz}},
researcherid-numbers = {{Stefanak, Martin/G-5239-2012}},
funding-acknowledgement = {{ {[}MSM 6840770039]; {[}MSMT LC06002]; {[}SGS11/132/OHK4/2T/14]}},
funding-text = {{We acknowledge the financial support from MSM 6840770039, MSMT LC06002
and SGS11/132/OHK4/2T/14.}},
number-of-cited-references = {{27}},
times-cited = {{2}},
journal-iso = {{Eur. Phys. J. D}},
doc-delivery-number = {{958NJ}},
unique-id = {{ISI:000305245400032}}
}
@article{ISI:000302405400048,
author = {Schreiber, Andreas and Gabris, Aurel and Rohde, Peter P. and Laiho,
Kaisa and Stefanak, Martin and Potocek, Vaclav and Hamilton, Craig and
Jex, Igor and Silberhorn, Christine},
title = {{A 2D Quantum Walk Simulation of Two-Particle Dynamics}},
journal = {{SCIENCE}},
year = {{2012}},
volume = {{336}},
number = {{6077}},
pages = {{55-58}},
month = {{APR 6}},
abstract = {{Multidimensional quantum walks can exhibit highly nontrivial topological
structure, providing a powerful tool for simulating quantum information
and transport systems. We present a flexible implementation of a
two-dimensional (2D) optical quantum walk on a lattice, demonstrating a
scalable quantum walk on a nontrivial graph structure. We realized a
coherent quantum walk over 12 steps and 169 positions by using an
optical fiber network. With our broad spectrum of quantum coins, we were
able to simulate the creation of entanglement in bipartite systems with
conditioned interactions. Introducing dynamic control allowed for the
investigation of effects such as strong nonlinearities or two-particle
scattering. Our results illustrate the potential of quantum walks as a
route for simulating and understanding complex quantum systems.}},
publisher = {{AMER ASSOC ADVANCEMENT SCIENCE}},
address = {{1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Schreiber, A (Reprint Author), Univ Paderborn, Warburger Str 100, D-33098 Paderborn, Germany.
Schreiber, Andreas; Rohde, Peter P.; Laiho, Kaisa; Silberhorn, Christine, Univ Paderborn, D-33098 Paderborn, Germany.
Schreiber, Andreas; Laiho, Kaisa; Silberhorn, Christine, Max Planck Inst Sci Light, D-91058 Erlangen, Germany.
Gabris, Aurel; Stefanak, Martin; Potocek, Vaclav; Hamilton, Craig; Jex, Igor, Czech Tech Univ, Dept Phys, Fac Nucl Sci \& Phys Engn, Prague 11519, Czech Republic.
Gabris, Aurel, Hungarian Acad Sci, Wigner Res Ctr Phys, H-1525 Budapest, Hungary.
Rohde, Peter P., Macquarie Univ, Ctr Engn Quantum Syst, Dept Phys \& Astron, Sydney, NSW 2113, Australia.}},
doi = {{10.1126/science.1218448}},
issn = {{0036-8075}},
research-areas = {{Science \& Technology - Other Topics}},
web-of-science-categories = {{Multidisciplinary Sciences}},
author-email = {{andreas.schreiber@uni-paderborn.de}},
researcherid-numbers = {{Stefanak, Martin/G-5239-2012
Silberhorn, Christine/J-4919-2013}},
orcid-numbers = {{Silberhorn, Christine/0000-0002-2349-5443}},
funding-acknowledgement = {{German Israel Foundation {[}970/2007]; Australian Research Council
Centre of Excellence for Engineered Quantum Systems {[}CE110001013];
{[}MSM6840770039]; {[}MSMT LC06002]; {[}SGS10/294/OHK4/3T/14]; {[}GA
CR 202/08/H078]; {[}OTKA T83858]}},
funding-text = {{We acknowledge financial support from the German Israel Foundation
(project no. 970/2007). A.G., M.S., V.P., C.H., and I.J. acknowledge
grant support from MSM6840770039 and MSMT LC06002, SGS10/294/OHK4/3T/14,
GA CR 202/08/H078, and OTKA T83858. P.P.R. acknowledges support from the
Australian Research Council Centre of Excellence for Engineered Quantum
Systems (project no. CE110001013).}},
number-of-cited-references = {{27}},
times-cited = {{63}},
journal-iso = {{Science}},
doc-delivery-number = {{920LG}},
unique-id = {{ISI:000302405400048}}
}
@inproceedings{ISI:000310362402233,
author = {Schreiber, A. and Gabris, A. and Rohde, P. P. and Laiho, K. and
Stefanak, M. and Potocek, V. and Hamilton, C. and Jex, I. and
Silberhorn, C.},
book-group-author = {{IEEE}},
title = {{Quantum simulations with a two-dimensional Quantum Walk}},
booktitle = {{2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)}},
year = {{2012}},
note = {{Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, MAY 06-11,
2012}},
abstract = {{We present an experimental implementation of a quantum walk in two
dimensions, employing an optical fiber network. We simulated entangling
operations and nonlinear multi-particle interactions revealing phenomena
such as bound states. (C) 2011 Optical Society of America}},
publisher = {{IEEE}},
address = {{345 E 47TH ST, NEW YORK, NY 10017 USA}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{Schreiber, A (Reprint Author), Max Planck Inst Sci Light, Gunther Scharowsky Str 1 Bau 26, D-91058 Erlangen, Germany.
Schreiber, A.; Laiho, K.; Silberhorn, C., Max Planck Inst Sci Light, D-91058 Erlangen, Germany.}},
isbn = {{978-1-55752-933-6}},
research-areas = {{Engineering; Optics; Physics}},
web-of-science-categories = {{Engineering, Electrical \& Electronic; Optics; Physics, Applied}},
author-email = {{Andreas.Schreiber@mpl.mpg.de}},
researcherid-numbers = {{Stefanak, Martin/G-5239-2012
Silberhorn, Christine/J-4919-2013}},
orcid-numbers = {{Silberhorn, Christine/0000-0002-2349-5443}},
number-of-cited-references = {{4}},
times-cited = {{0}},
doc-delivery-number = {{BCK05}},
unique-id = {{ISI:000310362402233}}
}
@article{ISI:000295005900017,
author = {Brougham, T. and Nikolopoulos, G. M. and Jex, I.},
title = {{Perfect transfer of multiple excitations in quantum networks (vol 83,
artnno 022323, 2011)}},
journal = {{PHYSICAL REVIEW A}},
year = {{2011}},
volume = {{84}},
number = {{3}},
month = {{SEP 16}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Correction}},
language = {{English}},
doi = {{10.1103/PhysRevA.84.039902}},
article-number = {{039902}},
issn = {{1050-2947}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Nikolopoulos, Georgios/H-3023-2011}},
orcid-numbers = {{Nikolopoulos, Georgios/0000-0002-3937-2771}},
number-of-cited-references = {{1}},
times-cited = {{0}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{821WU}},
unique-id = {{ISI:000295005900017}}
}
@article{ISI:000295522500016,
author = {Lavicka, H. and Potocek, V. and Kiss, T. and Lutz, E. and Jex, I.},
title = {{Quantum walk with jumps}},
journal = {{EUROPEAN PHYSICAL JOURNAL D}},
year = {{2011}},
volume = {{64}},
number = {{1}},
pages = {{119-129}},
month = {{SEP}},
abstract = {{We analyze a special class of 1-D quantum walks (QWs) realized using
optical multi-ports. We assume non-perfect multi-ports showing errors in
the connectivity, i.e. with a small probability the multi-ports can
connect not to their nearest neighbor but to another multi-port at a
fixed distance - we call this a jump. We study two cases of QW with
jumps where multiple displacements can emerge at one timestep. The first
case assumes time-correlated jumps (static disorder). In the second
case, we choose the positions of jumps randomly in time (dynamic
disorder). The probability distributions of position of the QW walker in
both instances differ significantly: dynamic disorder leads to a
Gaussian-like distribution, while for static disorder we find two
distinct behaviors depending on the parity of jump size. In the case of
even-sized jumps, the distribution exhibits a three-peak profile around
the position of the initial excitation, whereas the probability
distribution in the odd case follows a Laplace-like discrete
distribution modulated by additional (exponential) peaks for long times.
Finally, our numerical results indicate that by an appropriate mapping a
universal functional behavior of the variance of the long-time
probability distribution can be revealed with respect to the scaled
average of jump size.}},
publisher = {{SPRINGER}},
address = {{233 SPRING ST, NEW YORK, NY 10013 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Lavicka, H (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague 1, Czech Republic.
Lavicka, H.; Potocek, V.; Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Czech Republic.
Lavicka, H., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Doppler Inst Math Phys \& Appl Math, CR-11519 Prague 1, Czech Republic.
Kiss, T., Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, H-1525 Budapest, Hungary.
Lutz, E., Univ Augsburg, Dept Phys, D-86135 Augsburg, Germany.}},
doi = {{10.1140/epjd/e2011-20138-8}},
issn = {{1434-6060}},
keywords-plus = {{NONEXTENSIVE STATISTICAL-MECHANICS; DYNAMICAL LOCALIZATION; ABSORPTION
PROBLEMS; CELLULAR-AUTOMATA; LIMIT-THEOREMS; ONE-DIMENSION; PAUL TRAP}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
author-email = {{hynek.lavicka@fjfi.cvut.cz}},
researcherid-numbers = {{Lutz, Eric/C-2713-2008
Kiss, Tamas/B-9228-2009}},
funding-acknowledgement = {{MSM {[}6840770039]; MSMT {[}LC 06002]; GACR {[}202/08/H072];
Czech-Hungarian cooperation project (KONTAKT) {[}CZ-11/2009]; Hungarian
Scientic Research Fund (OTKA) {[}K83858]; DFG {[}LU1382/1-1]; cluster of
excellence Nanosystems Initiative Munich (NIM)}},
funding-text = {{The financial support by MSM 6840770039, MSMT LC 06002, GACR
202/08/H072, the Czech-Hungarian cooperation project (KONTAKT
CZ-11/2009), Hungarian Scientic Research Fund (OTKA) under contract No.
K83858, the Emmy Noether Program of the DFG (contract No. LU1382/1-1)
and the cluster of excellence Nanosystems Initiative Munich (NIM) is
gratefully acknowledged.}},
number-of-cited-references = {{43}},
times-cited = {{2}},
journal-iso = {{Eur. Phys. J. D}},
doc-delivery-number = {{828SH}},
unique-id = {{ISI:000295522500016}}
}
@article{ISI:000301051200002,
author = {Kiss, T. and Vymetal, S. and Toth, L. D. and Gabris, A. and Jex, I. and
Alber, G.},
title = {{Measurement-Induced Chaos with Entangled States}},
journal = {{PHYSICAL REVIEW LETTERS}},
year = {{2011}},
volume = {{107}},
number = {{10}},
month = {{AUG 31}},
abstract = {{The dynamics of an ensemble of identically prepared two-qubit systems is
investigated which is subjected to the iteratively applied measurements
and conditional selection of a typical entanglement purification
protocol. The resulting dynamics exhibits strong sensitivity to initial
conditions. For one class of initial states two types of islands
characterize the asymptotic limit. They correspond to a separable and a
fully entangled two-qubit state, respectively, and their boundaries form
fractal-like structures. In the presence of incoherent noise an
additional stable asymptotic cycle appears.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Kiss, T (Reprint Author), Res Inst Solid State Phys \& Opt, POB 49, H-1525 Budapest, Hungary.
Kiss, T.; Toth, L. D.; Gabris, A., Res Inst Solid State Phys \& Opt, H-1525 Budapest, Hungary.
Vymetal, S.; Gabris, A.; Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, CR-11519 Prague 1, Stare Mesto, Czech Republic.
Toth, L. D., Univ Cambridge, DAMTP, Cambridge CB2 1TN, England.
Alber, G., Tech Univ Darmstadt, IAP, D-64289 Darmstadt, Germany.}},
doi = {{10.1103/PhysRevLett.107.100501}},
article-number = {{100501}},
issn = {{0031-9007}},
keywords-plus = {{QUANTUM-MECHANICS}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009}},
funding-acknowledgement = {{MSM {[}6840770039]; MSMT {[}LC 06002]; Czech-Hungarian cooperation
project (KONTAKT) {[}CZ-11/2009]; Hungarian Scientific Research Fund
(OTKA) {[}K83858]}},
funding-text = {{We acknowledge the financial support by MSM 6840770039, MSMT LC 06002,
and the Czech-Hungarian cooperation project (KONTAKT, CZ-11/2009) and by
the Hungarian Scientific Research Fund (OTKA) under Contract No. K83858.}},
number-of-cited-references = {{21}},
times-cited = {{2}},
journal-iso = {{Phys. Rev. Lett.}},
doc-delivery-number = {{902PU}},
unique-id = {{ISI:000301051200002}}
}
@article{ISI:000294268000001,
author = {Novotny, Jaroslav and Alber, Gernot and Jex, Igor},
title = {{Entanglement and Decoherence: Fragile and Robust Entanglement}},
journal = {{PHYSICAL REVIEW LETTERS}},
year = {{2011}},
volume = {{107}},
number = {{9}},
month = {{AUG 23}},
abstract = {{The destruction of entanglement of open quantum systems by decoherence
is investigated in the asymptotic long-time limit. For this purpose a
general and analytically solvable decoherence model is presented which
does not involve any weak-coupling or Markovian assumption. It is shown
that two fundamentally different classes of entangled states can be
distinguished and that they can be influenced significantly by two
important environmental properties, namely, its initially prepared state
and its size. Quantum states of the first class are fragile against
decoherence so that they can be disentangled asymptotically even if
coherences between pointer states are still present. Quantum states of
the second type are robust against decoherence. Asymptotically they can
be disentangled only if also decoherence is perfect. A simple criterion
for identifying these two classes on the basis of two-qubit entanglement
is presented.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Novotny, J (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague 1, Stare Mesto, Czech Republic.
Novotny, Jaroslav; Jex, Igor, Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Stare Mesto, Czech Republic.
Novotny, Jaroslav; Alber, Gernot, Tech Univ Darmstadt, Inst Angewandte Phys, D-64289 Darmstadt, Germany.}},
doi = {{10.1103/PhysRevLett.107.090501}},
article-number = {{090501}},
issn = {{0031-9007}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
funding-acknowledgement = {{Alexander von Humboldt Foundation; CASED; Czech Republic
{[}MSM6840770039, MSMT LC06002]}},
funding-text = {{Financial support by the Alexander von Humboldt Foundation, by CASED,
and by MSM6840770039 and MSMT LC06002 of the Czech Republic is
acknowledged.}},
number-of-cited-references = {{12}},
times-cited = {{5}},
journal-iso = {{Phys. Rev. Lett.}},
doc-delivery-number = {{812DM}},
unique-id = {{ISI:000294268000001}}
}
@article{ISI:000292002700003,
author = {Novotny, J. and Alber, G. and Jex, I.},
title = {{Asymptotic dynamics of qubit networks under randomly applied controlled
unitary transformations}},
journal = {{NEW JOURNAL OF PHYSICS}},
year = {{2011}},
volume = {{13}},
month = {{MAY 26}},
abstract = {{The asymptotic dynamics of many-qubit quantum systems is investigated
under iteratively and randomly applied unitary transformations. For a
one-parameter family of unitary transformations, which entangle pairs of
qubits, two main theorems are proved. They characterize completely the
dependence of the resulting asymptotic dynamics on the topology of the
interaction graph that encodes all possible qubit couplings. These
theorems exhibit clearly which aspects of an interaction graph are
relevant and which ones are irrelevant to the asymptotic dynamics. On
the basis of these theorems, the local entropy transport between an open
quantum system and its environment are explored for strong non-Markovian
couplings and for different sizes of the environment and different
interaction topologies. It is shown that although the randomly applied
unitary entanglement operations cannot decrease the overall entropy of
such a qubit network, a local entropy decrease or `cooling' of
subsystems is possible for special classes of interaction topologies.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Novotny, J (Reprint Author), Czech Tech Univ, Dept Phys, FNSPE, Brehova 7, Prague 11519 1, Czech Republic.
Novotny, J.; Jex, I., Czech Tech Univ, Dept Phys, FNSPE, Prague 11519 1, Czech Republic.
Novotny, J.; Alber, G., Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.}},
doi = {{10.1088/1367-2630/13/5/053052}},
article-number = {{053052}},
issn = {{1367-2630}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{novotny.jaroslav@seznam.cz}},
number-of-cited-references = {{24}},
times-cited = {{3}},
journal-iso = {{New J. Phys.}},
doc-delivery-number = {{782IW}},
unique-id = {{ISI:000292002700003}}
}
@article{ISI:000290304800001,
author = {Schreiber, A. and Cassemiro, K. N. and Potocek, V. and Gabris, A. and
Jex, I. and Silberhorn, Ch.},
title = {{Decoherence and Disorder in QuantumWalks: From Ballistic Spread to
Localization}},
journal = {{PHYSICAL REVIEW LETTERS}},
year = {{2011}},
volume = {{106}},
number = {{18}},
month = {{MAY 6}},
abstract = {{We investigate the impact of decoherence and static disorder on the
dynamics of quantum particles moving in a periodic lattice. Our
experiment relies on the photonic implementation of a one-dimensional
quantum walk. The pure quantum evolution is characterized by a ballistic
spread of a photon's wave packet along 28 steps. By applying controlled
time-dependent operations we simulate three different environmental
influences on the system, resulting in a fast ballistic spread, a
diffusive classical walk, and the first Anderson localization in a
discrete quantum walk architecture.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Schreiber, A (Reprint Author), Max Planck Inst Sci Light, Gunther Scharowsky Str 1 Bau 24, D-91058 Erlangen, Germany.
Schreiber, A.; Cassemiro, K. N.; Silberhorn, Ch., Max Planck Inst Sci Light, D-91058 Erlangen, Germany.
Potocek, V.; Gabris, A.; Jex, I., Czech Tech Univ, FNSPE, Dept Phys, Prague 11519, Czech Republic.
Silberhorn, Ch., Univ Paderborn, D-33098 Paderborn, Germany.}},
doi = {{10.1103/PhysRevLett.106.180403}},
article-number = {{180403}},
issn = {{0031-9007}},
keywords-plus = {{ANDERSON LOCALIZATION; WALKS; LATTICES}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{Andreas.Schreiber@mpl.mpg.de}},
researcherid-numbers = {{Gabris, Aurel/A-7615-2008
1, INCT/G-5846-2013
Informacao quantica, Inct/H-9493-2013
Silberhorn, Christine/J-4919-2013}},
orcid-numbers = {{Silberhorn, Christine/0000-0002-2349-5443}},
funding-acknowledgement = {{German Israel Foundation {[}970/2007]; AvH Foundation; OTKA {[}T83858];
{[}MSMT LC06002]; {[}MSM 6840770039]; {[}SGS10/294/OHK4/3T/14]}},
funding-text = {{We thank P. P. Rohde for helpful discussions. We acknowledge financial
support from the German Israel Foundation (Project No. 970/2007). K. N.
C. and I. J. acknowledge support from the AvH Foundation; V. P., A. G.,
and I. J. from MSMT LC06002 and MSM 6840770039; V. P. from
SGS10/294/OHK4/3T/14; and A. G. from OTKA T83858.}},
number-of-cited-references = {{30}},
times-cited = {{69}},
journal-iso = {{Phys. Rev. Lett.}},
doc-delivery-number = {{760DT}},
unique-id = {{ISI:000290304800001}}
}
@article{ISI:000289065200001,
author = {Stefanak, M. and Barnett, S. M. and Kollar, B. and Kiss, T. and Jex, I.},
title = {{Directional correlations in quantum walks with two particles}},
journal = {{NEW JOURNAL OF PHYSICS}},
year = {{2011}},
volume = {{13}},
month = {{MAR 21}},
abstract = {{Quantum walks on a line with a single particle possess a classical
analogue. Involving more walkers opens up the possibility of studying
collective quantum effects, such as many-particle correlations. In this
context, entangled initial states and the indistinguishability of the
particles play a role. We consider the directional correlations between
two particles performing a quantum walk on a line. For non-interacting
particles, we find analytic asymptotic expressions and give the limits
of directional correlations. We show that by introducing
delta-interaction between the particles, one can exceed the limits for
non-interacting particles.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague 1, Stare Mesto, Czech Republic.
Stefanak, M.; Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Stare Mesto, Czech Republic.
Barnett, S. M., Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland.
Kollar, B.; Kiss, T., Hungarian Acad Sci, Dept Quantum Opt \& Quantum Informat, Res Inst Solid State Phys \& Opt, H-1121 Budapest, Hungary.}},
doi = {{10.1088/1367-2630/13/3/033029}},
article-number = {{033029}},
issn = {{1367-2630}},
keywords-plus = {{ALGORITHMS; SEARCH}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{martin.stefanak@fjfi.cvut.cz}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012
Kollar, Balint/J-2297-2012}},
funding-acknowledgement = {{MSM {[}6840770039]; MSMT LC {[}06002]; Czech-Hungarian cooperation
project (KONTAKT) {[}CZ-11/2009]; Royal Society; Wolfson Foundation}},
funding-text = {{Financial support from MSM 6840770039, MSMT LC 06002 and the
Czech-Hungarian cooperation project (KONTAKT, CZ-11/2009) is gratefully
acknowledged. SMB thanks the Royal Society and the Wolfson Foundation
for support.}},
number-of-cited-references = {{66}},
times-cited = {{10}},
journal-iso = {{New J. Phys.}},
doc-delivery-number = {{744AV}},
unique-id = {{ISI:000289065200001}}
}
@article{ISI:000287711800003,
author = {Brougham, T. and Nikolopoulos, G. M. and Jex, I.},
title = {{Perfect transfer of multiple excitations in quantum networks}},
journal = {{PHYSICAL REVIEW A}},
year = {{2011}},
volume = {{83}},
number = {{2}},
month = {{FEB 24}},
abstract = {{We present a general formalism to the problem of perfect state transfer
(PST), where the state involves multiple excitations of the quantum
network. A key feature of our formalism is that it allows for inclusion
of nontrivial interactions between the excitations. Hence, it is
perfectly suited to addressing the problem of PST in the context of
various types of physical realizations. The general formalism is also
flexible enough to account for situations where multiple excitations are
``focused{''} onto the same site.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Brougham, T (Reprint Author), Czech Tech Univ, Dept Phys, FNSPE, Brehova 7, CZ-11519 Prague 1, Czech Republic.
Brougham, T.; Jex, I., Czech Tech Univ, Dept Phys, FNSPE, CZ-11519 Prague 1, Czech Republic.
Nikolopoulos, G. M., FORTH, Inst Elect Struct \& Laser, GR-71110 Iraklion, Crete, Greece.}},
doi = {{10.1103/PhysRevA.83.022323}},
article-number = {{022323}},
issn = {{1050-2947}},
keywords-plus = {{STATE TRANSFER; DYNAMICS; ENTANGLEMENT; CHAIN; DOTS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Nikolopoulos, Georgios/H-3023-2011}},
orcid-numbers = {{Nikolopoulos, Georgios/0000-0002-3937-2771}},
funding-acknowledgement = {{Doppler Institute; EC RTN EMALI {[}MRTN-CT-2006-035369];
{[}MSM6840770039]; {[}MSMT LC06002]}},
funding-text = {{T.B. and I.J. acknowledge financial support from the Doppler Institute
and from Grants No. MSM6840770039 and MSMT LC06002 of the Czech
Republic. G.M.N. acknowledges support from the EC RTN EMALI (Contract
No. MRTN-CT-2006-035369).}},
number-of-cited-references = {{20}},
times-cited = {{4}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{726HU}},
unique-id = {{ISI:000287711800003}}
}
@inproceedings{ISI:000302005200033,
author = {Schreiber, A. and Cassemiro, K. N. and Potocek, V. and Gabris, A. and
Jex, I. and Silberhorn, Ch},
editor = {{Ralph, T and Lam, PK}},
title = {{Photonic quantum walks in a fiber based recursion loop}},
booktitle = {{QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC): THE TENTH
INTERNATIONAL CONFERENCE}},
series = {{AIP Conference Proceedings}},
year = {{2011}},
volume = {{1363}},
note = {{10th International Conference on Quantum Communication, Measurement and
Computing (QCMC), Brisbane, AUSTRALIA, JUL 19-23, 2010}},
organization = {{Australian Res Council Ctr Excellence Quantum Comp Technol; Tamagawa
Univ; Australian Res Council Ctr Excellence Quantum-Atom Opt; Res Lab
Elect Massachusetts Inst Technol; NewSpec Pty Ltd; Oxford Instruments
Pty Ltd; Lastek Australia, Toptica Photon}},
abstract = {{We present a flexible and robust system for implementing one-dimensional
coined quantum walks. A recursion loop in the optical network together
with a translation of the spatial into the time domain ensures the
possible increment of the step number without need of additional optical
elements. An intrinsic phase stability assures a high degree of
coherence and hence guarantees a good scalability of the system. We
performed a quantum walk over 27 steps and analyzed the 54 output modes.
Furthermore, we estimated that up to 100 steps can be realized with only
minor changes in the used components.}},
publisher = {{AMER INST PHYSICS}},
address = {{2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{Schreiber, A (Reprint Author), Max Planck Inst Sci Light, Gunther Scharowsky Str 1,Bau 24, D-91058 Erlangen, Germany.
Schreiber, A.; Cassemiro, K. N.; Silberhorn, Ch, Max Planck Inst Sci Light, D-91058 Erlangen, Germany.}},
doi = {{10.1063/1.3630170}},
issn = {{0094-243X}},
isbn = {{978-0-7354-0921-7}},
keywords = {{Quantum walk; Quantum simulations}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Mathematical}},
researcherid-numbers = {{Silberhorn, Christine/J-4919-2013}},
orcid-numbers = {{Silberhorn, Christine/0000-0002-2349-5443}},
number-of-cited-references = {{10}},
times-cited = {{0}},
doc-delivery-number = {{BZM24}},
unique-id = {{ISI:000302005200033}}
}
@article{ISI:000288903600015,
author = {Hamilton, Craig S. and Gabris, Aurel and Jex, Igor and Barnett, Stephen
M.},
title = {{Quantum walk with a four-dimensional coin}},
journal = {{NEW JOURNAL OF PHYSICS}},
year = {{2011}},
volume = {{13}},
month = {{JAN}},
abstract = {{We examine the physical implementation of a discrete time quantum walk
with a four-dimensional coin. Our quantum walker is a photon moving
repeatedly through a time delay loop, with time being our position
space. The quantum coin is implemented using the internal states of the
photon: the polarization and two of the orbital angular momentum states.
We demonstrate how to implement this physically and what components
would be needed. We then illustrate some of the results that could be
obtained by performing the experiment.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Hamilton, CS (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague, Czech Republic.
Hamilton, Craig S.; Gabris, Aurel; Jex, Igor; Barnett, Stephen M., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Czech Republic.
Barnett, Stephen M., Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland.}},
doi = {{10.1088/1367-2630/13/1/013015}},
article-number = {{013015}},
issn = {{1367-2630}},
keywords-plus = {{ORBITAL ANGULAR-MOMENTUM; POLARIZATION; STATES; MODES; LIGHT}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{craig.hamilton@fjfi.cvut.cz}},
researcherid-numbers = {{Gabris, Aurel/A-7615-2008}},
funding-acknowledgement = {{Doppler Institute; FNSPE CTU in Prague; Royal Society; Wolfram
Foundation; {[}MSM6840770039]; {[}MSMT LC06002]}},
funding-text = {{We gratefully acknowledge helpful discussions with Professor C
Silberhorn, Dr K Cassemiro and Mr A Schreiber. CSH, AG and IJ
acknowledge financial support from the Doppler Institute, FNSPE CTU in
Prague and from grants MSM6840770039 and MSMT LC06002 of the Czech
Republic. SMB thanks the Royal Society and the Wolfram Foundation for
financial support.}},
number-of-cited-references = {{32}},
times-cited = {{9}},
journal-iso = {{New J. Phys.}},
doc-delivery-number = {{741YK}},
unique-id = {{ISI:000288903600015}}
}
@article{ISI:000288550100027,
author = {Brougham, T. and Kost'ak, V. and Jex, I. and Andersson, E. and Kiss, T.},
title = {{Entanglement preparation using symmetric multiports}},
journal = {{EUROPEAN PHYSICAL JOURNAL D}},
year = {{2011}},
volume = {{61}},
number = {{1}},
pages = {{231-236}},
month = {{JAN}},
abstract = {{We investigate the entanglement produced by a multi-path interferometer
that is composed of two symmetric multiports, with phase shifts applied
to the output of the first multiport. Particular attention is paid to
the case when we have a single photon entering the interferometer. For
this situation we derive a simple condition that characterizes the types
of entanglement that one can generate. We then show how one can use the
results from the single-photon case to determine what kinds of
multi-photon entangled states one can prepare using the interferometer.}},
publisher = {{SPRINGER}},
address = {{233 SPRING ST, NEW YORK, NY 10013 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Brougham, T (Reprint Author), Czech Tech Univ, Dept Phys, FNSPE, Brehova 7, Prague 11519 1, Czech Republic.
Brougham, T.; Kost'ak, V.; Jex, I., Czech Tech Univ, Dept Phys, FNSPE, Prague 11519 1, Czech Republic.
Andersson, E., Heriot Watt Univ, Dept Phys, SUPA, Sch EPS, Edinburgh, Midlothian, Scotland.
Kiss, T., Hungarian Acad Sci, Dept Quantum Opt \& Quantum Informat, Res Inst Solid State Phys \& Opt, H-1121 Budapest, Hungary.}},
doi = {{10.1140/epjd/e2010-10337-2}},
issn = {{1434-6060}},
keywords-plus = {{QUANTUM-THEORY; PARTICLE; STATE}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
author-email = {{thomas.brougham@gmail.com}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Andersson, Erika/D-1139-2013}},
orcid-numbers = {{Andersson, Erika/0000-0001-5856-6806}},
funding-acknowledgement = {{Royal Society {[}2006/R2IJP]; Czech Hungarian project {[}MEB 041011
(CZ-11/2009)]; Doppler Institute; Czech Republic {[}MSM 6840770039, MSMT
LC06002]}},
funding-text = {{We acknowledge financial support from the Royal Society International
Joint Project grant 2006/R2IJP and the Czech Hungarian project grant MEB
041011 (CZ-11/2009); T.B., V.K. and I.J. also acknowledge financial
support from the Doppler Institute and from grants MSM 6840770039 and
MSMT LC06002 of the Czech Republic.}},
number-of-cited-references = {{30}},
times-cited = {{2}},
journal-iso = {{Eur. Phys. J. D}},
doc-delivery-number = {{737DX}},
unique-id = {{ISI:000288550100027}}
}
@article{ISI:000288903600001,
author = {Rohde, Peter P. and Schreiber, Andreas and Stefanak, Martin and Jex,
Igor and Silberhorn, Christine},
title = {{Multi-walker discrete time quantum walks on arbitrary graphs, their
properties and their photonic implementation}},
journal = {{NEW JOURNAL OF PHYSICS}},
year = {{2011}},
volume = {{13}},
month = {{JAN}},
abstract = {{Quantum walks have emerged as an interesting alternative to the usual
circuit model for quantum computing. While still universal for quantum
computing, the quantum walk model has very different physical
requirements, which lends itself more naturally to some physical
implementations, such as linear optics. Numerous authors have considered
walks with one or two walkers, on one-dimensional graphs, and several
experimental demonstrations have been performed. In this paper, we
discuss generalizing the model of discrete time quantum walks to the
case of an arbitrary number of walkers acting on arbitrary graph
structures. We present a formalism that allows for the analysis of such
situations, and several example scenarios for how our techniques can be
applied. We consider the most important features of quantum
walks-measurement, distinguishability, characterization and the
distinction between classical and quantum interference. We also discuss
the potential for physical implementation in the context of linear
optics, which is of relevance to present-day experiments.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Rohde, PP (Reprint Author), Max Planck Inst Sci Light, Erlangen, Germany.
Rohde, Peter P.; Schreiber, Andreas; Silberhorn, Christine, Max Planck Inst Sci Light, Erlangen, Germany.
Rohde, Peter P., Univ Queensland, Ctr Quantum Comp Technol, Brisbane, Qld 4072, Australia.
Stefanak, Martin; Jex, Igor, Czech Tech Univ, Fac Nucl Sci Phys Engn, Dept Phys, CR-16635 Prague, Czech Republic.
Silberhorn, Christine, Univ Paderborn, Paderborn, Germany.}},
doi = {{10.1088/1367-2630/13/1/013001}},
article-number = {{013001}},
issn = {{1367-2630}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{dr.rohde@gmail.com}},
researcherid-numbers = {{Stefanak, Martin/G-5239-2012
Silberhorn, Christine/J-4919-2013}},
orcid-numbers = {{Silberhorn, Christine/0000-0002-2349-5443}},
funding-acknowledgement = {{Australian Research Council; Czech Ministry of Education
{[}MSM6840770039, MSMT LC06002]; German Israel Foundation {[}970/2007]}},
funding-text = {{We acknowledge Andreas Eckstein, Malte Avenhaus, Aurel Gabris and Vaclav
Potocek for very helpful discussions and Andreas Christ and Katiuscia
Cassemiro for immeasurably helpful discussions and critique. PR
acknowledges support from the Australian Research Council. MS and IJ
acknowledge grant support from the Czech Ministry of Education
(MSM6840770039 and MSMT LC06002). We acknowledge the German Israel
Foundation (project 970/2007) for financial support. While the
manuscript was under preparation, Peruzzo et al {[}16] experimentally
demonstrated an optical implementation of a two-photon quantum walk,
which overlaps with the techniques presented here.}},
number-of-cited-references = {{26}},
times-cited = {{27}},
journal-iso = {{New J. Phys.}},
doc-delivery-number = {{741YK}},
unique-id = {{ISI:000288903600001}}
}
@inproceedings{ISI:000291306100018,
author = {Kecskes, L. and Kiss, T. and Stefanak, M. and Jex, I.},
editor = {{Prochazka, I and Sobolewski, R and Fiurasek, J}},
title = {{The role of measurement in the recurrence property of discrete timed
quantum walks}},
booktitle = {{PHOTON COUNTING APPLICATIONS, QUANTUM OPTICS, AND QUANTUM INFORMATION
TRANSFER AND PROCESSING III}},
series = {{Proceedings of SPIE}},
year = {{2011}},
volume = {{8072}},
note = {{Conference on the Photon Counting Applications, Quantum Optics, and
Quantum Information Transfer and Processing III, Prague, CZECH REPUBLIC,
APR 18-20, 2011}},
organization = {{SPIE}},
abstract = {{The quantum mechanical generalisation of random walks (called Quantum
Walks) present us with a broader spectrum of possibilities compared to
their classical counterparts. The aim of the presented study is to
explore a new portion of this area by incorporating a new step in the
process of the Quantum Walk unique to quantum mechanics: the
measurement. Our focus lies in the characterising number of the
recurrence behaviour of the walk (Polya-number). We observe the effect
of the standard projective measurement, a yes-no measurement on the
origin and the effect of different measurement schemes (periodic and
random) on the definition and the numeric value of the Polya-number.}},
publisher = {{SPIE-INT SOC OPTICAL ENGINEERING}},
address = {{1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{Kecskes, L (Reprint Author), Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, Konkoly Thege M 29-33, H-1211 Budapest, Hungary.
Kecskes, L.; Kiss, T., Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, H-1211 Budapest, Hungary.}},
doi = {{10.1117/12.886813}},
article-number = {{80720U}},
issn = {{0277-786X}},
isbn = {{978-0-81948-662-2}},
research-areas = {{Engineering; Optics}},
web-of-science-categories = {{Engineering, Electrical \& Electronic; Optics}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012}},
number-of-cited-references = {{5}},
times-cited = {{0}},
doc-delivery-number = {{BVE53}},
unique-id = {{ISI:000291306100018}}
}
@article{ISI:000282330000019,
author = {Novotny, Jaroslav and Alber, Gernot and Jex, Igor},
title = {{Asymptotic evolution of random unitary operations}},
journal = {{CENTRAL EUROPEAN JOURNAL OF PHYSICS}},
year = {{2010}},
volume = {{8}},
number = {{6}},
pages = {{1001-1014}},
month = {{DEC}},
abstract = {{We analyze the asymptotic dynamics of quantum systems resulting from
large numbers of iterations of random unitary operations. Although, in
general, these quantum operations cannot be diagonalized it is shown
that their resulting asymptotic dynamics is described by a
diagonalizable superoperator. We prove that this asymptotic dynamics
takes place in a typically low dimensional attractor space which is
independent of the probability distribution of the unitary operations
applied. This vector space is spanned by all eigenvectors of the unitary
operations involved which are associated with eigenvalues of unit
modulus. Implications for possible asymptotic dynamics of iterated
random unitary operations are presented and exemplified in an example
involving random controlled-not operations acting on two qubits.}},
publisher = {{VERSITA}},
address = {{SOLIPSKA 14A-1, 02-482 WARSAW, POLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Novotny, J (Reprint Author), Tech Univ Darmstadt, Inst Angew Phys, Hsch Str 4A, D-64289 Darmstadt, Germany.
Novotny, Jaroslav; Alber, Gernot, Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.
Novotny, Jaroslav; Jex, Igor, FJFI CVUT Praze, Dept Phys, Prague 11519, Czech Republic.}},
doi = {{10.2478/s11534-010-0018-8}},
issn = {{1895-1082}},
eissn = {{1644-3608}},
keywords = {{random unitary map; asymptotic evolution; iterations; attractor; open
dynamics}},
keywords-plus = {{COMPLEX NETWORKS}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{novotny.jaroslav@seznam.cz}},
funding-acknowledgement = {{Czech Ministry of Education {[}MSM 6840770039, MSMT LC 06002]; Alexander
von Humboldt Foundation; DAAD; CASED}},
funding-text = {{Financial support by the Czech Ministry of Education (by MSM 6840770039
and MSMT LC 06002), by the Alexander von Humboldt Foundation, by the
DAAD, and by CASED is gratefully acknowledged.}},
number-of-cited-references = {{18}},
times-cited = {{9}},
journal-iso = {{Cent. Eur. J. Phys.}},
doc-delivery-number = {{656KB}},
unique-id = {{ISI:000282330000019}}
}
@article{ISI:000284693600013,
author = {Adam, P. and Kiss, T. and Darazs, Z. and Jex, I.},
title = {{Conditional generation of optical Schrodinger cat states}},
journal = {{PHYSICA SCRIPTA}},
year = {{2010}},
volume = {{T140}},
month = {{SEP}},
note = {{16th Central European Workshop on Quantum Optics, Turku, FINLAND, MAY
23-27, 2009}},
abstract = {{Given a source of two coherent state superpositions with small
separation in a travelling wave optical setting, we show that by
interference and balanced homodyne measurement it is possible to
conditionally prepare a symmetrically placed superposition of coherent
states around the origin of the phase space. The separation of coherent
states in the superposition will be amplified during the process.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article; Proceedings Paper}},
language = {{English}},
affiliation = {{Adam, P (Reprint Author), Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, Dept Quantum Opt \& Quantum Informat, Konkoly Thege M U 29-33, H-1121 Budapest, Hungary.
Adam, P.; Kiss, T.; Darazs, Z., Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, Dept Quantum Opt \& Quantum Informat, H-1121 Budapest, Hungary.
Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Stare Mesto, Czech Republic.}},
doi = {{10.1088/0031-8949/2010/T140/014011}},
article-number = {{014011}},
issn = {{0031-8949}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{adam@szfki.hu}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Darazs, Zoltan/C-8062-2013}},
orcid-numbers = {{Darazs, Zoltan/0000-0002-4795-1677}},
number-of-cited-references = {{13}},
times-cited = {{1}},
journal-iso = {{Phys. Scr.}},
doc-delivery-number = {{686JW}},
unique-id = {{ISI:000284693600013}}
}
@article{ISI:000284693600037,
author = {Stefanak, M. and Kollar, B. and Kiss, T. and Jex, I.},
title = {{Full revivals in 2D quantum walks}},
journal = {{PHYSICA SCRIPTA}},
year = {{2010}},
volume = {{T140}},
month = {{SEP}},
note = {{16th Central European Workshop on Quantum Optics, Turku, FINLAND, MAY
23-27, 2009}},
abstract = {{Recurrence of a random walk is described by the Polya number. For
quantum walks, recurrence is understood as the return of the walker to
the origin, rather than the full revival of its quantum state.
Localization for two-dimensional quantum walks is known to exist in the
sense of non-vanishing probability distribution in the asymptotic limit.
We show, on the example of the 2D Grover walk, that one can exploit the
effect of localization to construct stationary solutions. Moreover, we
find full revivals of a quantum state with a period of two steps. We
prove that there cannot be longer cycles for a four-state quantum walk.
Stationary states and revivals result from interference, which has no
counterpart in classical random walks.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article; Proceedings Paper}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), FJFI CVUT Praze, Dept Phys, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Stefanak, M.; Jex, I., FJFI CVUT Praze, Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.
Kollar, B.; Kiss, T., Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, Dept Quantum Opt \& Quantum Informat, H-1121 Budapest, Hungary.}},
doi = {{10.1088/0031-8949/2010/T140/014035}},
article-number = {{014035}},
issn = {{0031-8949}},
keywords-plus = {{CELLULAR-AUTOMATA}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{martin.stefanak@fjfi.cvut.cz}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012
Kollar, Balint/J-2297-2012}},
number-of-cited-references = {{21}},
times-cited = {{7}},
journal-iso = {{Phys. Scr.}},
doc-delivery-number = {{686JW}},
unique-id = {{ISI:000284693600037}}
}
@article{ISI:000279539300002,
author = {Kollar, B. and Stefanak, M. and Kiss, T. and Jex, I.},
title = {{Recurrences in three-state quantum walks on a plane}},
journal = {{PHYSICAL REVIEW A}},
year = {{2010}},
volume = {{82}},
number = {{1}},
month = {{JUL 6}},
abstract = {{We analyze the role of dimensionality in the time evolution of
discrete-time quantum walks through the example of the three-state walk
on a two-dimensional triangular lattice. We show that the three-state
Grover walk does not lead to trapping (localization) or recurrence to
the origin, in sharp contrast to the Grover walk on the two-dimensional
square lattice. We determine the power-law scaling of the probability at
the origin with the method of stationary phase. We prove that only a
special subclass of coin operators can lead to recurrence, and there are
no coins that lead to localization. The propagation for the recurrent
subclass of coins is quasi-one dimensional.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague 1, Stare Mesto, Czech Republic.
Stefanak, M.; Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Stare Mesto, Czech Republic.
Kollar, B.; Kiss, T., Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, Dept Quantum Opt \& Quantum Informat, H-1121 Budapest, Hungary.}},
doi = {{10.1103/PhysRevA.82.012303}},
article-number = {{012303}},
issn = {{1050-2947}},
keywords-plus = {{LATTICE}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
author-email = {{martin.stefanak@fjfi.cvut.cz
tkiss-libri@szfki.hu}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012
Kollar, Balint/J-2297-2012}},
funding-acknowledgement = {{MSM {[}6840770039]; MSMT {[}LC 06002]; Czech-Hungarian cooperation
Project {[}MEB041011, CZ-11/2009]}},
funding-text = {{T.K. thanks Gyorgy Kali and Misha Titov for interesting discussions. The
financial support by MSM Grant No. 6840770039, MSMT Grant No. LC 06002,
and the Czech-Hungarian cooperation Project No. (MEB041011, CZ-11/2009)
is gratefully acknowledged.}},
number-of-cited-references = {{30}},
times-cited = {{11}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{620YN}},
unique-id = {{ISI:000279539300002}}
}
@article{ISI:000274336800006,
author = {Schreiber, A. and Cassemiro, K. N. and Potocek, V. and Gabris, A. and
Mosley, P. J. and Andersson, E. and Jex, I. and Silberhorn, Ch.},
title = {{Photons Walking the Line: A Quantum Walk with Adjustable Coin Operations}},
journal = {{PHYSICAL REVIEW LETTERS}},
year = {{2010}},
volume = {{104}},
number = {{5}},
month = {{FEB 5}},
abstract = {{We present the first robust implementation of a coined quantum walk over
five steps using only passive optical elements. By employing a fiber
network loop we keep the amount of required resources constant as the
walker's position Hilbert space is increased. We observed a non-Gaussian
distribution of the walker's final position, thus characterizing a
faster spread of the photon wave packet in comparison to the classical
random walk. The walk is realized for many different coin settings and
initial states, opening the way for the implementation of a
quantum-walk-based search algorithm.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Schreiber, A (Reprint Author), Max Planck Inst Sci Light, Gunther Scharowsky Str 1 Bau 24, D-91058 Erlangen, Germany.
Schreiber, A.; Cassemiro, K. N.; Mosley, P. J.; Silberhorn, Ch., Max Planck Inst Sci Light, D-91058 Erlangen, Germany.
Potocek, V.; Gabris, A.; Jex, I., Czech Tech Univ, Dept Phys, FNSPE, Prague 11519, Czech Republic.
Andersson, E., Heriot Watt Univ, Sch EPS, SUPA, Edinburgh EH14 4AS, Midlothian, Scotland.}},
doi = {{10.1103/PhysRevLett.104.050502}},
article-number = {{050502}},
issn = {{0031-9007}},
keywords-plus = {{EXPERIMENTAL REALIZATION}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{Katiuscia.Cassemiro@mpl.mpg.de}},
researcherid-numbers = {{Gabris, Aurel/A-7615-2008
Andersson, Erika/D-1139-2013
Silberhorn, Christine/J-4919-2013}},
orcid-numbers = {{Andersson, Erika/0000-0001-5856-6806
Silberhorn, Christine/0000-0002-2349-5443}},
funding-acknowledgement = {{German Israel Foundation {[}970/2007]; Alexander von Humboldt
Foundation; Hungarian Scientific Research Fund {[}T049234, NF068736];
Royal Society {[}2006/R2-IJP]; {[}MT LC06002]; {[}MSM 6840770039];
{[}CZ-10/2007]; {[}GA CR 202/08/H078]}},
funding-text = {{We acknowledge financial support from the German Israel Foundation
(Project 970/2007). K. N. C. and I. J. acknowledge financial support
from the Alexander von Humboldt Foundation; V. P., A. G., and I. J. from
MS. MT LC06002, MSM 6840770039, and CZ-10/2007; V. P. from GA CR
202/08/H078; A. G. from the Hungarian Scientific Research Fund (T049234
and NF068736); E. A., I. J., V. P., and A. G. from the Royal Society
International Joint Project Grant No. 2006/R2-IJP.}},
number-of-cited-references = {{29}},
times-cited = {{131}},
journal-iso = {{Phys. Rev. Lett.}},
doc-delivery-number = {{553AM}},
unique-id = {{ISI:000274336800006}}
}
@article{ISI:000277856200008,
author = {Brougham, Thomas and Barnett, Stephen M. and Jex, Igor},
title = {{Interference of composite bosons}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{2010}},
volume = {{57}},
number = {{7}},
pages = {{587-594}},
abstract = {{We investigate multi-boson interference. A Hamiltonian is presented that
treats pairs of bosons as a single composite boson. This Hamiltonian
allows two pairs of bosons to interact as if they were two single
composite bosons. We show that this leads to the composite bosons
exhibiting novel interference effects, such as Hong-Ou-Mandel
interference. We then investigate generalisations of the formalism to
the case of interference between two general composite bosons. Finally,
we show how one can realise interference between composite bosons in the
two-atom Dicke model.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Brougham, T (Reprint Author), Czech Tech Univ, Dept Phys, FNSPE, Brehova 7, Prague 11519 1, Czech Republic.
Brougham, Thomas; Barnett, Stephen M.; Jex, Igor, Czech Tech Univ, Dept Phys, FNSPE, Prague 11519 1, Czech Republic.
Barnett, Stephen M., Univ Strathclyde, SUPA, Dept Phys, Glasgow G4 ONG, Lanark, Scotland.}},
doi = {{10.1080/09500340.2010.481731}},
issn = {{0950-0340}},
keywords = {{interference of bosons; quantum optics; Hong-Ou-Mandel effect}},
keywords-plus = {{DIRECTIONAL COUPLER; NONCLASSICAL LIGHT; QUANTUM STATES; CONVERSION}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
author-email = {{thomas.brougham@gmail.com}},
funding-acknowledgement = {{Doppler Institute of the Czech Republic; Royal Society; Wolfson
Foundation; Czech Republic Grants {[}MSM6840770039, MSMT LC06002]}},
funding-text = {{We acknowledge financial support from the Doppler Institute and from
Grants MSM6840770039 and MSMT LC06002 of the Czech Republic. S. M. B.
thanks the Royal Society and the Wolfson Foundation for financial
support.}},
number-of-cited-references = {{25}},
times-cited = {{2}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{598RP}},
unique-id = {{ISI:000277856200008}}
}
@article{ISI:000272310000060,
author = {Brougham, T. and Nikolopoulos, G. M. and Jex, I.},
title = {{Communication in quantum networks of logical bus topology}},
journal = {{PHYSICAL REVIEW A}},
year = {{2009}},
volume = {{80}},
number = {{5}},
month = {{NOV}},
abstract = {{Perfect state transfer (PST) is discussed in the context of passive
quantum networks with logical bus topology, where many logical nodes
communicate using the same shared media without any external control.
The conditions under which a number of point-to-point PST links may
serve as building blocks for the design of such multinode networks are
investigated. The implications of our results are discussed in the
context of various Hamiltonians that act on the entire network and are
capable of providing PST between the logical nodes of a prescribed set
in a deterministic manner.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Brougham, T (Reprint Author), FJFI CVUT Praze, Dept Phys, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Brougham, T.; Jex, I., FJFI CVUT Praze, Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.
Nikolopoulos, G. M., FORTH, Inst Elect Struct \& Laser, Iraklion 71110, Crete, Greece.}},
doi = {{10.1103/PhysRevA.80.052325}},
article-number = {{052325}},
issn = {{1050-2947}},
keywords = {{information theory; quantum communication; topology}},
keywords-plus = {{ELECTRON WAVEPACKET PROPAGATION; DYNAMICS; ENTANGLEMENT; CHAIN; DOTS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Nikolopoulos, Georgios/H-3023-2011}},
orcid-numbers = {{Nikolopoulos, Georgios/0000-0002-3937-2771}},
number-of-cited-references = {{30}},
times-cited = {{7}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{526RH}},
unique-id = {{ISI:000272310000060}}
}
@article{ISI:000268043300011,
author = {Marzoli, I. and Tombesi, P. and Ciaramicoli, G. and Werth, G. and
Bushev, P. and Stahl, S. and Schmidt-Kaler, F. and Hellwig, M. and
Henkel, C. and Marx, G. and Jex, I. and Stachowska, E. and Szawiola, G.
and Walaszyk, A.},
title = {{Experimental and theoretical challenges for the trapped electron quantum
computer}},
journal = {{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}},
year = {{2009}},
volume = {{42}},
number = {{15}},
month = {{AUG 14}},
abstract = {{We discuss quantum information processing with trapped electrons. After
recalling the operation principle of planar Penning traps, we sketch the
experimental conditions to load, cool and detect single electrons. Here
we present a detailed investigation of a scalable scheme including
feasibility studies and the analysis of all important elements, relevant
for the experimental stage. On the theoretical side, we discuss
different methods to couple electron qubits. We estimate the relevant
qubit coherence times and draw implications for the experimental
setting. A critical assessment of quantum information processing with
trapped electrons concludes the paper.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND}},
type = {{Review}},
language = {{English}},
affiliation = {{Marzoli, I (Reprint Author), Univ Camerino, Dipartimento Fis, I-62032 Camerino, Italy.
Marzoli, I.; Tombesi, P.; Ciaramicoli, G., Univ Camerino, Dipartimento Fis, I-62032 Camerino, Italy.
Werth, G.; Bushev, P.; Stahl, S., Johannes Gutenberg Univ Mainz, Dept Phys, D-55099 Mainz, Germany.
Schmidt-Kaler, F.; Hellwig, M., Univ Ulm, D-89069 Ulm, Germany.
Henkel, C., Univ Potsdam, Inst Phys \& Astron, D-14476 Potsdam, Germany.
Marx, G., Ernst Moritz Arndt Univ Greifswald, D-17489 Greifswald, Germany.
Jex, I., FJFI CVUT, Dept Phys, Prague 11519, Czech Republic.
Stachowska, E.; Szawiola, G.; Walaszyk, A., Poznan Tech Univ, PL-60965 Poznan, Poland.}},
doi = {{10.1088/0953-4075/42/15/154010}},
article-number = {{154010}},
issn = {{0953-4075}},
keywords-plus = {{PLANAR PENNING TRAP; IONS; COMPUTATION; GATE; CYCLOTRON; PARTICLES;
ALGORITHM; PULSES; DOTS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
author-email = {{irene.marzoli@unicam.it}},
researcherid-numbers = {{Henkel, Carsten/C-2540-2011
Szawiola, Gustaw/H-1575-2014}},
funding-acknowledgement = {{European Union {[}FP6-003772]}},
funding-text = {{We acknowledge financial support by the European Union within the sixth
framework programme (contract no. FP6-003772).}},
number-of-cited-references = {{68}},
times-cited = {{14}},
journal-iso = {{J. Phys. B-At. Mol. Opt. Phys.}},
doc-delivery-number = {{471GF}},
unique-id = {{ISI:000268043300011}}
}
@article{ISI:000267403500003,
author = {Novotny, J. and Alber, G. and Jex, I.},
title = {{Random unitary dynamics of quantum networks}},
journal = {{JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL}},
year = {{2009}},
volume = {{42}},
number = {{28}},
month = {{JUL 17}},
abstract = {{We investigate the asymptotic dynamics of quantum networks under
repeated applications of random unitary operations. It is shown that in
the asymptotic limit of large numbers of iterations this dynamics is
generally governed by a typically low dimensional attractor space. This
space is determined completely by the unitary operations involved and it
is independent of the probabilities with which these unitary operations
are applied. Based on this general feature analytical results are
presented for the asymptotic dynamics of arbitrarily large cyclic qubit
networks whose nodes are coupled by randomly applied controlled-NOT
operations.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Novotny, J (Reprint Author), Tech Univ Darmstadt, Inst Angew Phys, Petersenstr 30, D-64289 Darmstadt, Germany.
Novotny, J.; Alber, G., Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.
Novotny, J.; Jex, I., Czech Tech Univ, Dept Phys, Prague 11519 1, Czech Republic.}},
doi = {{10.1088/1751-8113/42/28/282003}},
article-number = {{282003}},
issn = {{1751-8113}},
eissn = {{1751-8121}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary; Physics, Mathematical}},
author-email = {{gernot.alber@physik.t-darmstadt.de}},
funding-acknowledgement = {{DAAD; Alexander von Humboldt Foundation; Czech Republic
{[}MSM6840770039, MSMT LC06002]}},
funding-text = {{Financial support by the DAAD, by the Alexander von Humboldt Foundation,
and by MSM6840770039 and MSMT LC06002 of the Czech Republic is
acknowledged.}},
number-of-cited-references = {{14}},
times-cited = {{11}},
journal-iso = {{J. Phys. A-Math. Theor.}},
doc-delivery-number = {{463BN}},
unique-id = {{ISI:000267403500003}}
}
@article{ISI:000269768300057,
author = {Kiss, T. and Kecskes, L. and Stefanak, M. and Jex, I.},
title = {{Recurrence in coined quantum walks}},
journal = {{PHYSICA SCRIPTA}},
year = {{2009}},
volume = {{T135}},
month = {{JUL}},
note = {{15th Central European Workshop on Quantum Optics, Belgrade, SERBIA, MAY
29-JUN 03, 2008}},
abstract = {{Recurrence of quantum walks on lattices can be characterized by the
generalized Polya number. Its value reflects the difference between a
classical and a quantum system. The dimension of the lattice is not a
unique parameter in the quantum case; both the coin operator and the
initial quantum state of the coin influence the recurrence in a
nontrivial way. In addition, the definition of the Polya number involves
measurement of the system. Depending on how measurement is included in
the definition, the recurrence properties vary. We show that in the
limiting case of frequent, strong measurements, one can approach the
classical dynamics. Comparing various cases, we have found numerical
indication that our previous definition of the Polya number provides an
upper limit.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article; Proceedings Paper}},
language = {{English}},
affiliation = {{Kiss, T (Reprint Author), Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, Konkoly Thege M U 29-33, H-1121 Budapest, Hungary.
Kiss, T.; Kecskes, L., Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, H-1121 Budapest, Hungary.
Stefanak, M.; Jex, I., FJFI CVUT Praze, Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.}},
doi = {{10.1088/0031-8949/2009/T135/014055}},
article-number = {{014055}},
issn = {{0031-8949}},
keywords-plus = {{CELLULAR-AUTOMATA}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{tkiss@szfki.hu}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012}},
number-of-cited-references = {{16}},
times-cited = {{4}},
journal-iso = {{Phys. Scr.}},
doc-delivery-number = {{493WB}},
unique-id = {{ISI:000269768300057}}
}
@article{ISI:000265678400027,
author = {Stefanak, M. and Kiss, T. and Jex, I.},
title = {{Recurrence of biased quantum walks on a line}},
journal = {{NEW JOURNAL OF PHYSICS}},
year = {{2009}},
volume = {{11}},
month = {{APR}},
abstract = {{The Polya number of a classical random walk on a regular lattice is
known to depend solely on the dimension of the lattice. For one and two
dimensions it equals one, meaning unit probability of returning to the
origin. This result is extremely sensitive to the directional symmetry,
and any deviation from the equal probability of travelling in each
direction results in a change of the character of the walk from
recurrent to transient. Applying our definition of the Polya number to
quantum walks on a line we show that the recurrence character of quantum
walks is more stable against bias. We determine the range of parameters
for which biased quantum walks remain recurrent. We find that there
exist genuine biased quantum walks that are recurrent.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Stefanak, M.; Jex, I., Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.
Kiss, T., Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, Dept Nonlinear \& Quantum Opt, H-1121 Budapest, Hungary.}},
doi = {{10.1088/1367-2630/11/4/043027}},
article-number = {{043027}},
issn = {{1367-2630}},
keywords-plus = {{ONE-DIMENSION}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{martin.stefanak@fjfi.cvut.cz}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012}},
number-of-cited-references = {{35}},
times-cited = {{19}},
journal-iso = {{New J. Phys.}},
doc-delivery-number = {{440DD}},
unique-id = {{ISI:000265678400027}}
}
@article{ISI:000263815000146,
author = {Hamilton, Craig S. and Lavicka, Hynek and Andersson, Erika and Jeffers,
John and Jex, Igor},
title = {{Quantum public key distribution with imperfect device components}},
journal = {{PHYSICAL REVIEW A}},
year = {{2009}},
volume = {{79}},
number = {{2}},
month = {{FEB}},
abstract = {{We examine the operation of a device for a public quantum key
distribution network. The recipients attempt to determine whether or not
their individual key copies, which are a sequence of coherent states,
are identical. To quantify the success of the protocol we use a
fidelity-based figure of merit and describe a method for increasing this
in the presence of noise and imperfect detectors. We show that the
fidelity may be written as the product of two factors: one that depends
on the properties of the device setup and another that depends on the
detectors used. We then demonstrate the effect various parameters have
on the overall effective operation of the device.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Hamilton, CS (Reprint Author), Univ Strathclyde, Dept Phys, SUPA, Computat Nonlinear \& Quantum Opt Grp, John Anderson Bldg,107 Rottenrow, Glasgow G4 0NG, Lanark, Scotland.
Hamilton, Craig S.; Andersson, Erika; Jeffers, John, Univ Strathclyde, Dept Phys, SUPA, Computat Nonlinear \& Quantum Opt Grp, Glasgow G4 0NG, Lanark, Scotland.
Lavicka, Hynek; Jex, Igor, Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Czech Republic.
Andersson, Erika, Heriot Watt Univ, Sch Engn \& Phys Sci, SUPA, Edinburgh EH14 4AS, Midlothian, Scotland.}},
doi = {{10.1103/PhysRevA.79.023808}},
article-number = {{023808}},
issn = {{1050-2947}},
eissn = {{1094-1622}},
keywords = {{cryptographic protocols; quantum cryptography}},
keywords-plus = {{STATES; CRYPTOGRAPHY; COHERENT; OPTICS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Jeffers, John/A-1738-2009
Andersson, Erika/D-1139-2013}},
orcid-numbers = {{Jeffers, John/0000-0002-8573-1675
Andersson, Erika/0000-0001-5856-6806}},
funding-acknowledgement = {{Royal Society International Joint Project scheme; Royal Society Dorothy
Hodgkin; EPSRC; {[}MSM 68407739]; {[}MSMT LC 06002]}},
funding-text = {{All authors gratefully acknowledge support from Czech Grants No. MSM
68407739 and No. MSMT LC 06002 and the Royal Society International Joint
Project scheme. E. A. also gratefully acknowledges support from the
Royal Society Dorothy Hodgkin scheme. C. S. H. acknowledges financial
support from EPSRC.}},
number-of-cited-references = {{27}},
times-cited = {{7}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{413TI}},
unique-id = {{ISI:000263815000146}}
}
@article{ISI:000270173800007,
author = {Brougham, Thomas and Chadzitaskos, Goce and Jex, Igor},
title = {{Transformation design and nonlinear Hamiltonians}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{2009}},
volume = {{56}},
number = {{14}},
pages = {{1588-1597}},
abstract = {{We study a class of nonlinear Hamiltonians, with applications in quantum
optics. The interaction terms of these Hamiltonians are generated by
taking a linear combination of powers of a simple `beam splitter'
Hamiltonian. The entanglement properties of the eigenstates are studied.
Finally, we show how to use this class of Hamiltonians to perform
special tasks such as conditional state swapping, which can be used to
generate optical cat states and to sort photons.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Brougham, T (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague 1, Czech Republic.
Brougham, Thomas; Chadzitaskos, Goce; Jex, Igor, Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague 1, Czech Republic.}},
doi = {{10.1080/09500340903194633}},
issn = {{0950-0340}},
keywords = {{quantum optics; nonlinear optics; quantum information}},
keywords-plus = {{LOSSLESS BEAM SPLITTER; ORTHOGONAL POLYNOMIALS; SU(2) SYMMETRY; QUANTUM;
SYSTEMS; STATISTICS; MECHANICS; STATES}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
author-email = {{thomas.brougham@gmail.com}},
funding-acknowledgement = {{Czech Republic {[}MSM-6840770039, MSMT LC06002]}},
funding-text = {{We acknowledge financial support from Grants MSM-6840770039 and MSMT
LC06002 of the Czech Republic. The authors are obliged to Professor A.
Odzijewicz for helpful comments and remarks.}},
number-of-cited-references = {{23}},
times-cited = {{1}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{498VR}},
unique-id = {{ISI:000270173800007}}
}
@article{ISI:000262979000060,
author = {Potocek, V. and Gabris, A. and Kiss, T. and Jex, I.},
title = {{Optimized quantum random-walk search algorithms on the hypercubel}},
journal = {{PHYSICAL REVIEW A}},
year = {{2009}},
volume = {{79}},
number = {{1}},
month = {{JAN}},
abstract = {{Shenvi, Kempe, and Whaley's quantum random-walk search (SKW) algorithm
{[}Phys. Rev. A 67, 052307 (2003)] is known to require O(root N) number
of oracle queries to find the marked element, where N is the size of the
search space. The overall time complexity of the SKW algorithm differs
from the best achievable on a quantum computer only by a constant
factor. We present improvements to the SKW algorithm which yield a
significant increase in success probability, and an improvement on query
complexity such that the theoretical limit of a search algorithm
succeeding with probability close to one is reached. We point out which
improvement can be applied if there is more than one marked element to
find.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Potocek, V (Reprint Author), Czech Tech Univ, FJFI,Dept Phys, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Potocek, V.; Gabris, A.; Jex, I., Czech Tech Univ, FJFI,Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.
Gabris, A.; Kiss, T., Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, H-1525 Budapest, Hungary.}},
doi = {{10.1103/PhysRevA.79.012325}},
article-number = {{012325}},
issn = {{1050-2947}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Gabris, Aurel/A-7615-2008}},
number-of-cited-references = {{16}},
times-cited = {{28}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{401YE}},
unique-id = {{ISI:000262979000060}}
}
@article{ISI:000259689400036,
author = {Stefanak, M. and Kiss, T. and Jex, I.},
title = {{Recurrence properties of unbiased coined quantum walks on infinite
d-dimensional lattices}},
journal = {{PHYSICAL REVIEW A}},
year = {{2008}},
volume = {{78}},
number = {{3}},
month = {{SEP}},
abstract = {{The Polya number characterizes the recurrence of a random walk. We apply
the generalization of this concept to quantum walks {[}M. Stefanak et
al., Phys. Rev. Lett. 100, 020501 (2008)] which is based on a specific
measurement scheme. The Polya number of a quantum walk depends, in
general, on the choice of the coin and the initial coin state, in
contrast to classical random walks where the lattice dimension uniquely
determines it. We analyze several examples to depict the variety of
possible recurrence properties. First, we show that for the class of
quantum walks driven by Hadamard tensor-product coins, the Polya number
is independent of the initial conditions and the actual coin operators,
thus resembling the property of the classical walks. We provide an
estimation of the Polya number for this class of quantum walks. Second,
we examine the two-dimensional Grover walk, which exhibits localization
and thus is recurrent, except for a particular initial state for which
the walk is transient. We generalize the Grover walk to show that one
can construct in arbitrary dimensions a quantum walk which is recurrent.
This is in great contrast with classical walks which are recurrent only
for the dimensions d=1,2. Finally, we analyze the recurrence of the 2D
Fourier walk. This quantum walk is recurrent except for a
two-dimensional subspace of the initial states. We provide an estimation
of the Polya number in its dependence on the initial state.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), Czech Tech Univ, FJFI,Dept Phys, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Stefanak, M.; Jex, I., Czech Tech Univ, FJFI,Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.
Kiss, T., Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, Dept Nonlinear \& Quantum Opt, H-1121 Budapest, Hungary.}},
doi = {{10.1103/PhysRevA.78.032306}},
article-number = {{032306}},
issn = {{1050-2947}},
keywords-plus = {{CELLULAR-AUTOMATA; SCATTERING-THEORY; LIMIT-THEOREMS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012}},
number-of-cited-references = {{59}},
times-cited = {{36}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{355DO}},
unique-id = {{ISI:000259689400036}}
}
@article{ISI:000258398400020,
author = {Kiss, T. and Jex, I. and Alber, G. and Kollar, E.},
title = {{Properties of complex chaos in conditional qubit dynamics}},
journal = {{INTERNATIONAL JOURNAL OF QUANTUM INFORMATION}},
year = {{2008}},
volume = {{6}},
number = {{1}},
pages = {{695-700}},
month = {{JUL}},
note = {{International Meeting on Noise, Information and Complexity AT Quantum
Scale, Erice, ITALY, NOV 02-10, 2007}},
abstract = {{Complex chaos is specified by an iterated mapping on complex numbers. It
has recently been found in the dynamics of qubits where each time step
is conditioned on a measurement result on part of the system. We analyse
the simplest case of one qubit dynamics with one complex parameter in
some detail. We point out that two attractive cycles can exist and
provide examples how the fractal like Julia set divides the areas of
corresponding initial states. We show how to determine the set of
parameters for which one, two or no stable fixed cycles exists and
provide the numerically calculated images of the sets. The results can
be relevant for the quantum state purification protocol based on the
similar dynamics of two or more qubits and in general for any protocol
based on conditioned nonlinear dynamics where truly chaotic behavior may
occur.}},
publisher = {{WORLD SCIENTIFIC PUBL CO PTE LTD}},
address = {{5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE}},
type = {{Article; Proceedings Paper}},
language = {{English}},
affiliation = {{Kiss, T (Reprint Author), Res Inst Solid State Phys \& Opt, POB 49, H-1525 Budapest, Hungary.
Kiss, T., Res Inst Solid State Phys \& Opt, H-1525 Budapest, Hungary.
Jex, I., Czech Tech Univ, FJFI,Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.
Alber, G., Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.
Kollar, E., Eotvos Lorand Univ, H-1117 Budapest, Hungary.}},
doi = {{10.1142/S0219749908003979}},
issn = {{0219-7499}},
keywords = {{quantum chaos; complex chaos; purification}},
research-areas = {{Computer Science; Physics}},
web-of-science-categories = {{Computer Science, Theory \& Methods; Physics, Particles \& Fields;
Physics, Mathematical}},
author-email = {{tkiss@szfki.hu}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009}},
number-of-cited-references = {{12}},
times-cited = {{2}},
journal-iso = {{Int. J. Quantum Inf.}},
doc-delivery-number = {{336XG}},
unique-id = {{ISI:000258398400020}}
}
@article{ISI:000252476500021,
author = {Geberth, D. and Kern, O. and Alber, G. and Jex, I.},
title = {{Stabilization of quantum information by combined dynamical decoupling
and detected-jump error correction}},
journal = {{EUROPEAN PHYSICAL JOURNAL D}},
year = {{2008}},
volume = {{46}},
number = {{2}},
pages = {{381-394}},
month = {{FEB}},
abstract = {{Two possible applications of random decoupling are discussed. Whereas so
far decoupling methods have been considered merely for quantum memories,
here it is demonstrated that random decoupling is also a convenient tool
for stabilizing quantum algorithms. Furthermore, a decoupling scheme is
presented which involves a random decoupling method compatible with
detected-jump error correcting quantum codes. With this combined error
correcting strategy it is possible to stabilize quantum information
against both spontaneous decay and static imperfections of a qubit-based
quantum information processor in an efficient way.}},
publisher = {{SPRINGER}},
address = {{233 SPRING ST, NEW YORK, NY 10013 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Geberth, D (Reprint Author), Tech Univ Darmstadt, Inst Angew Phys, Petersenstr 30, D-64289 Darmstadt, Germany.
Geberth, D.; Kern, O.; Alber, G., Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.
Jex, I., Czech Tech Univ, FJFI, Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.}},
doi = {{10.1140/epjd/e2007-00303-6}},
issn = {{1434-6060}},
keywords-plus = {{SIMULATION; FIDELITY; CODES; DECAY; CHAOS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
author-email = {{oliver.kern@physik.tu-darmstadt.de}},
number-of-cited-references = {{23}},
times-cited = {{0}},
journal-iso = {{Eur. Phys. J. D}},
doc-delivery-number = {{252WC}},
unique-id = {{ISI:000252476500021}}
}
@article{ISI:000252471200003,
author = {Stefanak, M. and Jex, I. and Kiss, T.},
title = {{Recurrence and polya number of quantum walks}},
journal = {{PHYSICAL REVIEW LETTERS}},
year = {{2008}},
volume = {{100}},
number = {{2}},
month = {{JAN 18}},
abstract = {{We analyze the recurrence probability (Polya number) for d-dimensional
unbiased quantum walks. A sufficient condition for a quantum walk to be
recurrent is derived. As a by-product we find a simple criterion for
localization of quantum walks. In contrast with classical walks, where
the Polya number is characteristic for the given dimension, the
recurrence probability of a quantum walk depends in general on the
topology of the walk, choice of the coin and the initial state. This
allows us to change the character of the quantum walk from recurrent to
transient by altering the initial state.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), Czech Tech Univ, FJFI, Dept Phys, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Stefanak, M.; Jex, I., Czech Tech Univ, FJFI, Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.
Stefanak, M., Univ Ulm, Inst Quantum Phys, D-89069 Ulm, Germany.
Kiss, T., Hungarian Acad Sci, Res Inst Solid State Phys Opt, Dept Nonlinear \& Quantum Opt, H-1121 Budapest, Hungary.}},
doi = {{10.1103/PhysRevLett.100.020501}},
article-number = {{020501}},
issn = {{0031-9007}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012}},
number-of-cited-references = {{22}},
times-cited = {{41}},
journal-iso = {{Phys. Rev. Lett.}},
doc-delivery-number = {{252UD}},
unique-id = {{ISI:000252471200003}}
}
@inproceedings{ISI:000263640400034,
author = {Vymetal, S. and Kiss, T. and Jex, I. and Alber, G. and Gabris, A. and
Langrova, T.},
editor = {{Robnik, M and Romanovski, VG}},
title = {{Chaos in the conditional dynamics of two qubits purification protocol}},
booktitle = {{LET'S FACE CHAOS THROUGH NONLINEAR DYNAMICS}},
series = {{AIP Conference Proceedings}},
year = {{2008}},
volume = {{1076}},
pages = {{255-261}},
note = {{7th International Summer School and Conference on Lets Face Chaos
through Nonlinear Dynamics, Univ Maribor, Maribor, SLOVENIA, JUN 29-JUL
13, 2008}},
organization = {{Slovenian Res Agcy; GEN Energija; Telekom Slovenije; Nova KBM}},
abstract = {{The presence of complex chaos in iterative apphcations of selective
dynamics on quantum systems is a novel form of quantum chaos with true
sensitivity to initial conditions. Techniques for the study of pure
states are extended to the two-qubit case(1).}},
publisher = {{AMER INST PHYSICS}},
address = {{2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{Vymetal, S (Reprint Author), FJFI CVUT, Dept Phys, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Vymetal, S.; Jex, I.; Gabris, A.; Langrova, T., FJFI CVUT, Dept Phys, Prague 11519 1, Stare Mesto, Czech Republic.}},
issn = {{0094-243X}},
isbn = {{978-0-7354-0607-0}},
keywords = {{complex chaos; quantum chaos; purification protocol}},
research-areas = {{Mathematics; Physics}},
web-of-science-categories = {{Mathematics, Applied; Physics, Mathematical}},
author-email = {{stanislav.vymetal@gmail.com}},
researcherid-numbers = {{Gabris, Aurel/A-7615-2008}},
number-of-cited-references = {{7}},
times-cited = {{0}},
doc-delivery-number = {{BIX85}},
unique-id = {{ISI:000263640400034}}
}
@article{ISI:000251985900037,
author = {Gabris, A. and Kiss, T. and Jex, I.},
title = {{Scattering quantum random-walk search with errors}},
journal = {{PHYSICAL REVIEW A}},
year = {{2007}},
volume = {{76}},
number = {{6}},
month = {{DEC}},
abstract = {{We analyze the realization of a quantum-walk search algorithm in a
passive, linear optical network. The specific model enables us to
consider the effect of realistic sources of noise and losses on the
search efficiency. Photon loss uniform in all directions is shown to
lead to the rescaling of search time. Deviation from directional
uniformity leads to the enhancement of the search efficiency compared to
uniform loss with the same average. In certain cases even increasing
loss in some of the directions can improve search efficiency. We show
that while we approach the classical limit of the general search
algorithm by introducing random phase fluctuations, its utility for
searching is lost. Using numerical methods, we found that for static
phase errors the averaged search efficiency displays a damped
oscillatory behavior that asymptotically tends to a nonzero value.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Gabris, A (Reprint Author), Res Inst Solid State Phys \& Opt, POB 49, H-1525 Budapest, Hungary.
Gabris, A.; Kiss, T., Res Inst Solid State Phys \& Opt, H-1525 Budapest, Hungary.
Jex, I., Czech Tech Univ, FJFI, Dept Phys, Prague 11519, Czech Republic.}},
doi = {{10.1103/PhysRevA.76.062315}},
article-number = {{062315}},
issn = {{1050-2947}},
keywords-plus = {{MULTIPORT}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Gabris, Aurel/A-7615-2008
Kiss, Tamas/B-9228-2009}},
number-of-cited-references = {{31}},
times-cited = {{12}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{246CU}},
unique-id = {{ISI:000251985900037}}
}
@article{ISI:000247624300191,
author = {Tereszkiewicz, Agnieszka and Odzijewicz, Anatol and Horowski, Maciej and
Jex, Igor and Chadzitaskos, Goce},
title = {{Explicitly solvable models of a two-mode coupler in Kerr media}},
journal = {{PHYSICAL REVIEW A}},
year = {{2007}},
volume = {{75}},
number = {{6}},
month = {{JUN}},
abstract = {{We present exact solutions for two nonlinear models each of which
describes parametric down conversion of photons as well as the Kerr
effect. The Hamiltonians for these models are related to the dual Hahn
finite orthogonal polynomials. Explicit expressions are obtained for the
spectra and for the eigenvectors of the Hamiltonians. A discussion of
the physical characteristics of the systems is presented.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Tereszkiewicz, A (Reprint Author), Univ Bialystok, Inst Math, Lipowa 41, PL-15424 Bialystok, Poland.
Univ Bialystok, Inst Math, PL-15424 Bialystok, Poland.
Czech Tech Univ, Dept Phys, CR-11519 Prague, Czech Republic.}},
doi = {{10.1103/PhysRevA.75.063817}},
article-number = {{063817}},
issn = {{1050-2947}},
keywords-plus = {{NONLINEAR QUANTUM OPTICS; ORTHOGONAL POLYNOMIALS; PERIODIC DECAY;
STATES; CONVERSION; REVIVAL; SYSTEMS; ALGEBRAS; ATOM}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
author-email = {{tereszk@uwb.edu.pl
aodzijew@uwb.edu.pl
horowski@alpha.uwb.edu.pl
igor.jex@fjfi.cvut.cz
goce.chadzitaskos@fjfi.cvut.cz}},
number-of-cited-references = {{29}},
times-cited = {{1}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{184EQ}},
unique-id = {{ISI:000247624300191}}
}
@article{ISI:000246890400037,
author = {Probst-Schendzielorz, Stefan T. and Wolf, Alexander and Freyberger,
Matthias and Jex, Igor and He, Bing and Bergou, Janos A.},
title = {{Unambiguous discriminator for unknown quantum states: An implementation}},
journal = {{PHYSICAL REVIEW A}},
year = {{2007}},
volume = {{75}},
number = {{5}},
month = {{MAY}},
abstract = {{We give a scheme for a physical implementation of the programmable state
discriminator that unambiguously discriminates between two unknown qubit
states with optimal probability of success. One copy of each of the
unknown states is provided as input, or program, for the two program
registers, and the data state, which is guaranteed to be prepared in one
of the program states, is fed into the data register of the device. This
device will then tell us, in an optimal way, which of the templates
stored in the program registers the data state matches. The
implementation is based on Neumark's theorem. We introduce a single
qubit as ancilla and a unitary operator that entangles the system with
the ancilla in such a way that projective measurements performed in the
computational basis of the system plus ancilla transform the initial
system states according to the optimal positive-operator-valued measure.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Probst-Schendzielorz, ST (Reprint Author), Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Czech Tech Univ Prague, Dept Phys, FNSPE, Prague 11519, Czech Republic.
CUNY Hunter Coll, Dept Phys \& Astron, Beijing 100021, Peoples R China.}},
doi = {{10.1103/PhysRevA.75.052116}},
article-number = {{052116}},
issn = {{1050-2947}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
author-email = {{Stefan.Probst@uni-ulm.de}},
number-of-cited-references = {{15}},
times-cited = {{10}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{173RO}},
unique-id = {{ISI:000246890400037}}
}
@article{ISI:000246074600044,
author = {Kostak, V. and Nikolopoulos, G. M. and Jex, I.},
title = {{Perfect state transfer in networks of arbitrary topology and coupling
configuration}},
journal = {{PHYSICAL REVIEW A}},
year = {{2007}},
volume = {{75}},
number = {{4}},
month = {{APR}},
abstract = {{A general formalism of the problem of perfect state transfer is
presented. We show that there are infinitely many Hamiltonians that may
provide a solution to this problem. In a first attempt to give a
classification of them we investigate their possible forms and the
related dynamics during the transfer. Finally, we show how the present
formalism can be used for the engineering of perfect quantum wires of
various topologies and coupling configurations.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Kostak, V (Reprint Author), Czech Tech Univ, Dept Phys, FJFI, Brehova 7, Prague 11519 1, Czech Republic.
Czech Tech Univ, Dept Phys, FJFI, Prague 11519 1, Czech Republic.
Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.}},
doi = {{10.1103/PhysRevA.75.042319}},
article-number = {{042319}},
issn = {{1050-2947}},
keywords-plus = {{N-LEVEL ATOMS; ELECTRON WAVEPACKET PROPAGATION; COHERENT DYNAMICS;
ENTANGLEMENT GENERATION; QUANTUM DOTS; MOLECULES}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Nikolopoulos, Georgios/H-3023-2011}},
orcid-numbers = {{Nikolopoulos, Georgios/0000-0002-3937-2771}},
number-of-cited-references = {{27}},
times-cited = {{33}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{162GJ}},
unique-id = {{ISI:000246074600044}}
}
@article{ISI:000246074600034,
author = {Novotny, J. and Alber, G. and Jex, I.},
title = {{Network implementation of covariant two-qubit quantum operations}},
journal = {{PHYSICAL REVIEW A}},
year = {{2007}},
volume = {{75}},
number = {{4}},
month = {{APR}},
abstract = {{A six-qubit quantum network consisting of conditional unitary gates is
presented which is capable of implementing a large class of covariant
two-qubit quantum operations. Optimal covariant NOT operations for one-
and two-qubit systems are special cases contained in this class. The
design of this quantum network exploits basic algebraic properties which
also shed light onto these covariant quantum processes.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Novotny, J (Reprint Author), Czech Tech Univ, Dept Phys, FJFI, Brehova 7, Prague 11519 1, Czech Republic.
Czech Tech Univ, Dept Phys, FJFI, Prague 11519 1, Czech Republic.
Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.}},
doi = {{10.1103/PhysRevA.75.042309}},
article-number = {{042309}},
issn = {{1050-2947}},
keywords-plus = {{OPTIMAL CLONING; PURE STATES}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{14}},
times-cited = {{0}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{162GJ}},
unique-id = {{ISI:000246074600034}}
}
@article{ISI:000242406200010,
author = {Stefanak, M. and Kiss, T. and Jex, I. and Mohring, B.},
title = {{The meeting problem in the quantum walk}},
journal = {{JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL}},
year = {{2006}},
volume = {{39}},
number = {{48}},
pages = {{14965-14983}},
month = {{DEC 1}},
abstract = {{We study the motion of two non-interacting quantum particles performing
a random walk on a line and analyse the probability that the two
particles are detected at a particular position after a certain number
of steps (meeting problem). The results are compared to the
corresponding classical problem and differences are pointed out.
Analytic formulae for the meeting probability and its asymptotic
behaviour are derived. The decay of the meeting probability for
distinguishable particles is faster than in the classical case, but not
quadratically. Entangled initial states and the bosonic or fermionic
nature of the walkers are considered.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Stefanak, M (Reprint Author), Czech Tech Univ, Dept Phys, FJFI, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Czech Tech Univ, Dept Phys, FJFI, Prague 11519 1, Stare Mesto, Czech Republic.
Hungarian Acad Sci, Res Inst Solid State Phys \& Opt, Dept Nonlinear \& Quantum Opt, H-1121 Budapest, Hungary.
Univ Ulm, Inst Quantum Phys, D-89069 Ulm, Germany.}},
doi = {{10.1088/0305-4470/39/48/009}},
issn = {{0305-4470}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary; Physics, Mathematical}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012}},
number-of-cited-references = {{27}},
times-cited = {{8}},
journal-iso = {{J. Phys. A-Math. Gen.}},
doc-delivery-number = {{110UG}},
unique-id = {{ISI:000242406200010}}
}
@article{ISI:000241723100001,
author = {Kiss, T. and Jex, I. and Alber, G. and Vymetal, S.},
title = {{Complex chaos in the conditional dynamics of qubits}},
journal = {{PHYSICAL REVIEW A}},
year = {{2006}},
volume = {{74}},
number = {{4}},
month = {{OCT}},
abstract = {{We analyze the consequences of iterative measurement-induced
nonlinearity on the dynamical behavior of qubits. We present a one-qubit
scheme where the equation governing the time evolution is a
complex-valued nonlinear map with one complex parameter. In contrast to
the usual notion of quantum chaos, exponential sensitivity to the
initial state occurs here. We calculate analytically the Lyapunov
exponent based on the overlap of quantum states, and find that it is
positive. We present a few illustrative examples of the emerging
dynamics.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Kiss, T (Reprint Author), Res Inst Solid State Phys \& Opt, POB 49, H-1525 Budapest, Hungary.
Res Inst Solid State Phys \& Opt, H-1525 Budapest, Hungary.
Czech Tech Univ, Dept Phys, FJFI, Prague 11519 1, Czech Republic.
Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.}},
doi = {{10.1103/PhysRevA.74.040301}},
article-number = {{040301}},
issn = {{1050-2947}},
keywords-plus = {{EXPONENTIAL SENSITIVITY; QUANTUM-SYSTEMS; LOCALIZATION}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009}},
number-of-cited-references = {{25}},
times-cited = {{9}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{101EX}},
unique-id = {{ISI:000241723100001}}
}
@article{ISI:000240238300021,
author = {Andersson, Erika and Curty, Marcos and Jex, Igor},
title = {{Experimentally realizable quantum comparison of coherent states and its
applications}},
journal = {{PHYSICAL REVIEW A}},
year = {{2006}},
volume = {{74}},
number = {{2}},
month = {{AUG}},
abstract = {{When comparing quantum states to each other, it is possible to obtain an
unambiguous answer, indicating that the states are definitely different,
already after a single measurement. In this paper we investigate
comparison of coherent states, which is the simplest example of quantum
state comparison for continuous variables. The method we present has a
high success probability, and is experimentally feasible to realize as
the only required components are beam splitters and photon detectors. An
easily realizable method for quantum state comparison could be important
for real applications. As examples of such applications we present a
``lock and key{''} scheme and a simple scheme for quantum public key
distribution.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Andersson, E (Reprint Author), Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland.
Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland.
Univ Erlangen Nurnberg, Inst Theoret Phys 1, Quantum Informat Theory Grp, D-91058 Erlangen, Germany.
Univ Erlangen Nurnberg, Inst Opt Informat \& Photon, Max Planck Res Grp, D-91058 Erlangen, Germany.
Czech Tech Univ, Dept Phys, FNSPE, Prague 1, Czech Republic.}},
doi = {{10.1103/PhysRevA.74.022304}},
article-number = {{022304}},
issn = {{1050-2947}},
keywords-plus = {{SYSTEMS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Andersson, Erika/D-1139-2013
Curty, Marcos/L-2416-2014}},
orcid-numbers = {{Andersson, Erika/0000-0001-5856-6806
Curty, Marcos/0000-0002-0330-6828}},
number-of-cited-references = {{25}},
times-cited = {{39}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{080HK}},
unique-id = {{ISI:000240238300021}}
}
@article{ISI:000238694900044,
author = {Novotny, J. and Alber, G. and Jex, I.},
title = {{Completely positive covariant two-qubit quantum processes and optimal
quantum NOT operations for entangled qubit pairs}},
journal = {{PHYSICAL REVIEW A}},
year = {{2006}},
volume = {{73}},
number = {{6}},
month = {{JUN}},
abstract = {{The structure is investigated of all completely positive quantum
operations that transform pure two-qubit input states of a given degree
of entanglement in a covariant way. Special cases thereof are quantum
NOT operations which transform entangled pure two-qubit input states of
a given degree of entanglement into orthogonal states in an optimal way.
Based on our general analysis all covariant optimal two-qubit quantum
NOT operations are determined. In particular, it is demonstrated that
only in the case of maximally entangled input states can these quantum
NOT operations be performed perfectly.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Novotny, J (Reprint Author), Czech Tech Univ, Dept Phys, FJFI, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Czech Tech Univ, Dept Phys, FJFI, Prague 11519 1, Stare Mesto, Czech Republic.
Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.}},
doi = {{10.1103/PhysRevA.73.062311}},
article-number = {{062311}},
issn = {{1050-2947}},
keywords-plus = {{OPTIMAL CLONING; PURE STATES; MAPS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{20}},
times-cited = {{3}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{058WI}},
unique-id = {{ISI:000238694900044}}
}
@article{ISI:000233112500019,
author = {Novotny, J and Stefanak, M and Kiss, T and Jex, I},
title = {{Control of entanglement in Ising-type networks with one and two
excitations}},
journal = {{JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL}},
year = {{2005}},
volume = {{38}},
number = {{41}},
pages = {{9087-9103}},
month = {{OCT 14}},
abstract = {{We analyse the dynamics of single- and two-particle states in Ising-type
networks. The mutual entanglement is quantified using the concept of
concurrence. We derive explicit expressions for the concurrence for
single and two-particle initial states in arbitrary passive networks and
specify the result for Ising-type networks. We show how to design a
network to prepare a prescribed pattern of entanglement for one
excitation and study the maximum attainable entanglement for passive
optical networks in general. The effect of network randomization on the
average entanglement is also studied.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Novotny, J (Reprint Author), Czech Tech Univ, Dept Phys, FJFI, Brehova 7, CS-11519 Prague 1, Czech Republic.
Czech Tech Univ, Dept Phys, FJFI, CS-11519 Prague 1, Czech Republic.
Hungarian Acad Sci, Dept Nonlinear \& Quantum Opt, Res Inst Solid State Phys \& Opt, H-1121 Budapest, Hungary.}},
doi = {{10.1088/0305-4470/38/41/017}},
issn = {{0305-4470}},
keywords-plus = {{INTERACTING PARTICLES; STATES}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary; Physics, Mathematical}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Stefanak, Martin/G-5239-2012}},
number-of-cited-references = {{18}},
times-cited = {{4}},
journal-iso = {{J. Phys. A-Math. Gen.}},
doc-delivery-number = {{981UC}},
unique-id = {{ISI:000233112500019}}
}
@article{ISI:000230108100011,
author = {Andersson, E and Bergou, J and Jex, I},
title = {{Comparison of unitary transforms using Franson interferometry}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{2005}},
volume = {{52}},
number = {{10}},
pages = {{1485-1494}},
month = {{JUL 10}},
abstract = {{Unknown unitary transforms may be compared to each other in a way which
makes it possible to obtain an unambiguous answer, indicating that the
transforms are different, already after a single application of each
transform. Quantum comparison strategies may be useful for example if we
want to test the performance of individual gates in a quantum
information or quantum computing network. It is then possible to check
for errors by comparing the elements to a master copy of the gate,
instead of performing a complete tomography of the gate. In this paper
we propose a versatile linear optical implementation based on the
Franson interferometer with short and long arms. A click in the wrong
output port unambiguously determines that the tested gate is faulty.
This set-up can also be used for a variety of other tasks, such as
confirming that the two transforms do not commute or do not anticommute.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Andersson, E (Reprint Author), Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland.
Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland.
CUNY Hunter Coll, Dept Phys \& Astron, New York, NY 10021 USA.
Czech Tech Univ Prague, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Czech Republic.}},
doi = {{10.1080/09500340500052911}},
issn = {{0950-0340}},
keywords-plus = {{QUANTUM-SYSTEMS; STATES; TIME}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
author-email = {{erika@phys.strath.ac.uk}},
researcherid-numbers = {{Andersson, Erika/D-1139-2013}},
orcid-numbers = {{Andersson, Erika/0000-0001-5856-6806}},
number-of-cited-references = {{10}},
times-cited = {{2}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{939YG}},
unique-id = {{ISI:000230108100011}}
}
@article{ISI:000228752700052,
author = {Novotny, J and Alber, G and Jex, I},
title = {{Optimal copying of entangled two-qubit states}},
journal = {{PHYSICAL REVIEW A}},
year = {{2005}},
volume = {{71}},
number = {{4}},
month = {{APR}},
abstract = {{We investigate the problem of copying pure two-qubit states of a given
degree of entanglement in an optimal way. Completely positive covariant
quantum operations are constructed which maximize the fidelity of the
output states with respect to two separable copies. These optimal
copying processes hint at the intricate relationship between fundamental
laws of quantum theory and entanglement.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Novotny, J (Reprint Author), Czech Tech Univ, Dept Phys, FJFI, Brehova 7, Prague 11519 1, Stare Mesto, Czech Republic.
Czech Tech Univ, Dept Phys, FJFI, Prague 11519 1, Stare Mesto, Czech Republic.
Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.}},
doi = {{10.1103/PhysRevA.71.042332}},
article-number = {{042332}},
issn = {{1050-2947}},
keywords-plus = {{OPTIMAL CLONING; QUANTUM BIT; QUBITS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{24}},
times-cited = {{7}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{921GR}},
unique-id = {{ISI:000228752700052}}
}
@article{ISI:000223254200013,
author = {Chefles, A and Andersson, E and Jex, I},
title = {{Unambiguous comparison of the states of multiple quantum systems}},
journal = {{JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL}},
year = {{2004}},
volume = {{37}},
number = {{29}},
pages = {{7315-7340}},
month = {{JUL 23}},
abstract = {{We consider N quantum systems initially prepared in pure states and
address the problem of unambiguously comparing them. One may ask whether
or not all N systems are in the same state. Alternatively, one may ask
whether or not the states of all N systems are different. We investigate
the possibility of unambiguously obtaining this kind of information. It
is found that some unambiguous comparison tasks are possible only when
certain linear independence conditions are satisfied. We also obtain
measurement strategies for certain comparison tasks which are optimal
under a broad range of circumstances, in particular when the states are
completely unknown. Such strategies, which we call universal comparison
strategies, are found to have intriguing connections with the problem of
quantifying the distinguishability of a set of quantum states and also
with unresolved conjectures in linear algebra. We finally investigate a
potential generalization of unambiguous state comparison, which we term
unambiguous overlap filtering.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Chefles, A (Reprint Author), Univ Hertfordshire, Sch Phys Astron \& Math, Hatfield AL10 9AB, Herts, England.
Univ Hertfordshire, Sch Phys Astron \& Math, Hatfield AL10 9AB, Herts, England.
Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland.
Czech Tech Univ, FNSPE, Dept Phys, Prague 11519, Czech Republic.}},
doi = {{10.1088/0305-4470/37/29/009}},
issn = {{0305-4470}},
keywords-plus = {{DISCRIMINATION; DETERMINANT; PERMANENT}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary; Physics, Mathematical}},
researcherid-numbers = {{Andersson, Erika/D-1139-2013}},
orcid-numbers = {{Andersson, Erika/0000-0001-5856-6806}},
number-of-cited-references = {{34}},
times-cited = {{20}},
journal-iso = {{J. Phys. A-Math. Gen.}},
doc-delivery-number = {{845OM}},
unique-id = {{ISI:000223254200013}}
}
@article{ISI:000187993900004,
author = {Jex, I and Andersson, E and Chefles, A},
title = {{Comparing the states of many quantum systems}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{2004}},
volume = {{51}},
number = {{4}},
pages = {{505-523}},
month = {{MAR 10}},
abstract = {{We investigate how to determine whether the states of a set of quantum
systems are identical or not. This paper treats both error-free
comparison, and comparison where errors in the result are allowed.
Error-free comparison means that we aim to obtain definite answers,
which are known to be correct, as often as possible. In general, we will
also have to accept inconclusive results, giving no information. To
obtain a definite answer that the states of the systems are not
identical is always possible, whereas in the situation considered here,
a definite answer that they are identical will not be possible. The
optimal universal error-free comparison strategy is a projection onto
the totally symmetric and the different non-symmetric subspaces,
invariant under permutations and unitary transformations. We also show
how to construct optimal comparison strategies when allowing for some
errors in the result, minimizing either the error probability, or the
average cost of making an error. We point out that it is possible to
realize universal error-free comparison strategies using only linear
elements and particle detectors, albeit with less than ideal efficiency.
Also minimum-error and minimum-cost strategies may sometimes be realized
in this way. This is of great significance for practical applications of
quantum comparison.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Jex, I (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague, Czech Republic.
Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Czech Republic.
Univ Hertfordshire, Dept Phys Sci, Hatfield AL10 9AB, Herts, England.
Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland.}},
doi = {{10.1080/09500340310001620475}},
issn = {{0950-0340}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Andersson, Erika/D-1139-2013}},
orcid-numbers = {{Andersson, Erika/0000-0001-5856-6806}},
number-of-cited-references = {{23}},
times-cited = {{16}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{762QP}},
unique-id = {{ISI:000187993900004}}
}
@article{ISI:000181878900011,
author = {Andersson, E and Jex, I and Barnett, SM},
title = {{Comparison of unitary transforms}},
journal = {{JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL}},
year = {{2003}},
volume = {{36}},
number = {{9}},
pages = {{2325-2338}},
month = {{MAR 7}},
abstract = {{We analyse the problem of comparing unitary transformations. The task is
to decide, with minimal resources and maximal reliability, whether two
given unitary transformations are identical or different. It is possible
to make such. comparisons without obtaining any information about the
individual transformations. Different comparison strategies are
presented and compared with respect to their efficiency. With an
interferometric setup, it is possible to compare two unitary transforms
using only one test particle. Another strategy makes use of a
two-particle singlet state. This strategy is more efficient than using a
non-entangled two-particle test state, thus demonstrating the benefit of
entanglement. Generalizations to higher.-dimensional transforms and to
more than two transformations are made.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Andersson, E (Reprint Author), Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland.
Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland.
Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Czech Republic.}},
doi = {{10.1088/0305-4470/36/9/310}},
issn = {{0305-4470}},
keywords-plus = {{ENTANGLEMENT; PRECISION; STATES}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary; Physics, Mathematical}},
researcherid-numbers = {{Andersson, Erika/D-1139-2013}},
orcid-numbers = {{Andersson, Erika/0000-0001-5856-6806}},
number-of-cited-references = {{21}},
times-cited = {{9}},
journal-iso = {{J. Phys. A-Math. Gen.}},
doc-delivery-number = {{661EU}},
unique-id = {{ISI:000181878900011}}
}
@article{ISI:000180674100003,
author = {Barnett, SM and Chefles, A and Jex, I},
title = {{Comparison of two unknown pure quantum states}},
journal = {{PHYSICS LETTERS A}},
year = {{2003}},
volume = {{307}},
number = {{4}},
pages = {{189-195}},
month = {{FEB 3}},
abstract = {{Can we establish whether or not two quantum systems have been prepared
in the same state? We investigate the possibility of universal
unambiguous state comparison. We show that it is impossible to
conclusively identify two pure unknown states as being identical, and
construct the optimal measurement for conclusively identifying them as
being different. We then derive optimal strategies for state comparison
when the state of each system is one of two known states. (C) 2002
Elsevier Science B.V. All rights reserved.}},
publisher = {{ELSEVIER SCIENCE BV}},
address = {{PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}},
type = {{Article}},
language = {{English}},
affiliation = {{Chefles, A (Reprint Author), Univ Hertfordshire, Dept Phys Sci, Hatfield AL10 9AB, Herts, England.
Univ Hertfordshire, Dept Phys Sci, Hatfield AL10 9AB, Herts, England.
Univ Strathclyde, Dept Phys \& Appl Phys, Glasgow G4 0NG, Lanark, Scotland.
Czech Tech Univ, FANS, Dept Phys, Prague 11519, Czech Republic.}},
doi = {{10.1016/S0375-9601(02)01602-X}},
issn = {{0375-9601}},
keywords = {{quantum mechanics; quantum information; quantum measurement}},
keywords-plus = {{DISCRIMINATION}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
number-of-cited-references = {{16}},
times-cited = {{56}},
journal-iso = {{Phys. Lett. A}},
doc-delivery-number = {{640EC}},
unique-id = {{ISI:000180674100003}}
}
@article{ISI:000181566900019,
author = {Jex, I and Alber, G and Barnett, SM and Delgado, A},
title = {{Antisymmetric multi-partite quantum states and their applications}},
journal = {{FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS}},
year = {{2003}},
volume = {{51}},
number = {{2-3}},
pages = {{172-178}},
note = {{9th Central European Workshop on Quantum Optics, SZEGED, HUNGARY, MAY
03-06, 2002}},
abstract = {{Entanglement is a powerful resource for processing quantum information.
In this context pure, maximally entangled states have received
considerable attention. In the case of bipartite qubit-systems the four
orthonormal Bell-states are of this type. One of these Bell states, the
singlet Bell-state, has the additional property of being antisymmetric
with respect to particle exchange. In this contribution we discuss
possible generalizations of this antisymmetric Bell-state to cases with
more than two particles and with single-particle Hilbert spaces
involving more than two dimensions. We review basic properties of these
totally antisymmetric states. Among possible applications of this class
of states we analyze a new quantum key sharing protocol and methods for
comparing quantum states.}},
publisher = {{WILEY-BLACKWELL}},
address = {{COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA}},
type = {{Article; Proceedings Paper}},
language = {{English}},
affiliation = {{Jex, I (Reprint Author), Czech Tech Univ, Dept Phys, FNSPE, Brehova 7, Prague 11519, Czech Republic.
Czech Tech Univ, Dept Phys, FNSPE, Prague 11519, Czech Republic.
Tech Univ Darmstadt, Inst Angew Phys, D-64289 Darmstadt, Germany.
Univ Strathclyde, Dept Phys \& Appl Phys, Glasgow Q4 0NG, Lanark, Scotland.
Univ New Mexico, Dept Phys \& Astron, Albuquerque, NM 87131 USA.}},
doi = {{10.1002/prop.200310021}},
issn = {{0015-8208}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{jex@br.fjfi.cvut.cz}},
researcherid-numbers = {{Delgado, Aldo/K-7564-2012}},
number-of-cited-references = {{7}},
times-cited = {{7}},
journal-iso = {{Fortschritte Phys.-Prog. Phys.}},
doc-delivery-number = {{655RR}},
unique-id = {{ISI:000181566900019}}
}
@article{ISI:000176853700002,
author = {Meneghini, S and Jex, I and Schleich, WP and Yakovlev, VP},
title = {{Reshaping of atomic waves with two-dimensional optical crystals}},
journal = {{JOURNAL OF OPTICS B-QUANTUM AND SEMICLASSICAL OPTICS}},
year = {{2002}},
volume = {{4}},
number = {{3}},
pages = {{165-171}},
month = {{JUN}},
abstract = {{We study the dynamics of atomic waves in a two-dimensional light crystal
formed by two crossed standing laser fields. The longitudinal modulation
of the crystal with the Doppler frequency significantly influences the
transversal spatial modulation of the atomic wave. Near the doppleron
resonance the atomic density shows a fractional space period. In this
case a normally incident wave gives rise to an almost perfect conversion
into the first momentum components and the light crystal acts as a
highly efficient beamsplitter. The crossing angle, determining the
Doppler frequency, is the easy-to-control parameter of the system.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Meneghini, S (Reprint Author), Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Czech Tech Univ, Dept Phys, FJFI, Prague 11519, Czech Republic.
Moscow Engn Phys Inst, Moscow 115409, Russia.}},
doi = {{10.1088/1464-4266/4/3/301}},
issn = {{1464-4266}},
keywords = {{atom optics; Bragg diffraction; population conversion}},
keywords-plus = {{STANDING LIGHT-WAVE; BRAGG SCATTERING}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Applied}},
number-of-cited-references = {{24}},
times-cited = {{0}},
journal-iso = {{J. Opt. B-Quantum Semicl. Opt.}},
doc-delivery-number = {{573WA}},
unique-id = {{ISI:000176853700002}}
}
@article{ISI:000175743800026,
author = {Torma, P and Jex, I and Schleich, WP},
title = {{Localization and diffusion in Ising-type quantum networks}},
journal = {{PHYSICAL REVIEW A}},
year = {{2002}},
volume = {{65}},
number = {{5, A}},
month = {{MAY}},
abstract = {{We investigate the effect of phase randomness in Ising-type quantum
networks. These networks model a large class of physical systems. They
describe micro- and nanostructures or arrays of optical elements such as
beam splitters (interferometers) or parameteric amplifiers. Most of
these stuctures are promising candidates for quantum information
processing networks. We demonstrate that such systems exhibit two very
distinct types of behavior. For certain network configurations
(parameters), they show quantum localization similar to Anderson
localization whereas classical stochastic behavior is observed in other
cases. We relate these findings to the standard theory of quantum
localization.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Torma, P (Reprint Author), Univ Jyvaskyla, Dept Phys, POB 35, FIN-40351 Jyvaskyla, Finland.
Univ Jyvaskyla, Dept Phys, FIN-40351 Jyvaskyla, Finland.
Helsinki Univ Technol, Lab Computat Engn, FIN-02015 Helsinki, Finland.
Czech Tech Univ, FNSPE, Dept Phys, Prague 11519 1, Czech Republic.
Univ Ulm, Abt Quantenphys, D-89081 Ulm, Germany.}},
doi = {{10.1103/PhysRevA.65.052110}},
article-number = {{052110}},
issn = {{1050-2947}},
keywords-plus = {{LANDAU-ZENER ANTICROSSINGS; TIME EVOLUTION; ATOMS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{30}},
times-cited = {{12}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{554PC}},
unique-id = {{ISI:000175743800026}}
}
@article{ISI:000208901700003,
author = {Alber, Gernot and Delgado, Aldo and Jex, Igor},
title = {{OPTIMAL TWO-PARTICLE ENTANGLEMENT BY UNIVERSAL QUANTUM PROCESSES}},
journal = {{QUANTUM INFORMATION \& COMPUTATION}},
year = {{2001}},
volume = {{1}},
number = {{3}},
pages = {{33-51}},
month = {{NOV}},
abstract = {{Within the class of all possible universal (covariant) two-particle
quantum processes in arbitrary dimensional Hilbert spaces those
universal quantum processes are determined whose output states optimize
the recently proposed entanglement measure of Vidal and Werner. It is
demonstrated that these optimal entanglement processes belong to a
one-parameter family of universal entanglement processes whose output
states do not contain any separable components. It is shown that these
optimal universal entanglement processes generate antisymmetric output
states and, with the single exception of qubit systems, they preserve
information about the initial input state.}},
publisher = {{RINTON PRESS, INC}},
address = {{565 EDMUND TERRACE, PARAMUS, NJ 07652 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Alber, G (Reprint Author), Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Alber, Gernot; Delgado, Aldo, Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Jex, Igor, FJFI CVUT, Dept Phys, Prague 11519 1, Czech Republic.}},
issn = {{1533-7146}},
keywords = {{Entanglement; universal quantum processes; quantum cloning}},
research-areas = {{Computer Science; Physics}},
web-of-science-categories = {{Computer Science, Theory \& Methods; Physics, Particles \& Fields;
Physics, Mathematical}},
funding-acknowledgement = {{DFG within the SPP `Quanteninformationsverarbeitung'; European
Commission {[}IST-1999-13021]; European Science Foundation; DAAD; DLR;
Ministry of Education of the Czech Republic}},
funding-text = {{This work is supported by the DFG within the SPP
`Quanteninformationsverarbeitung', by the programmes `QUBITS'
(IST-1999-13021) and `QUEST' of the European Commission, by the European
Science Foundation within the `QUIT' programme, by the DAAD, by the DLR
and by the Ministry of Education of the Czech Republic.}},
number-of-cited-references = {{20}},
times-cited = {{5}},
journal-iso = {{Quantum Inform. Comput.}},
doc-delivery-number = {{V31RW}},
unique-id = {{ISI:000208901700003}}
}
@article{ISI:000172118600011,
author = {Alber, G and Delgado, A and Gisin, N and Jex, I},
title = {{Efficient bipartite quantum state purification in arbitrary dimensional
Hilbert spaces}},
journal = {{JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL}},
year = {{2001}},
volume = {{34}},
number = {{42}},
pages = {{8821-8833}},
month = {{OCT 26}},
abstract = {{A new purification scheme is proposed which applies to arbitrary
dimensional bipartite quantum systems. It is based on the repeated
application of a special class of nonlinear quantum maps and a single,
local unitary operation. This special class of nonlinear quantum maps is
generated in a natural way by a Hermitian generalized XOR-gate. The
proposed purification scheme offers two major advantages, namely it does
not require local depolarization operations at each step of the
purification procedure and it purifies more efficiently than other known
purification schemes.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Alber, G (Reprint Author), Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Univ Geneva, Grp Appl Phys, CH-1211 Geneva 4, Switzerland.
Czech Tech Univ, Dept Phys, FJFI, Prague 11519 1, Czech Republic.}},
doi = {{10.1088/0305-4470/34/42/307}},
issn = {{0305-4470}},
keywords-plus = {{ERROR-CORRECTION; NOISY CHANNELS; COMMUNICATION; ENTANGLEMENT;
SEPARABILITY; COMPUTATION; GATES}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary; Physics, Mathematical}},
researcherid-numbers = {{Delgado, Aldo/K-7564-2012}},
number-of-cited-references = {{21}},
times-cited = {{43}},
journal-iso = {{J. Phys. A-Math. Gen.}},
doc-delivery-number = {{491PZ}},
unique-id = {{ISI:000172118600011}}
}
@article{ISI:000171981300001,
author = {Jex, I},
title = {{Foreword}},
journal = {{FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS}},
year = {{2001}},
volume = {{49}},
number = {{10-11}},
pages = {{899}},
publisher = {{WILEY-V C H VERLAG GMBH}},
address = {{PO BOX 10 11 61, D-69451 BERLIN, GERMANY}},
type = {{Editorial Material}},
language = {{English}},
doi = {{10.1002/1521-3978(200110)49:10/11<899::AID-PROP899>3.0.CO;2-K}},
issn = {{0015-8208}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
number-of-cited-references = {{0}},
times-cited = {{0}},
journal-iso = {{Fortschritte Phys.-Prog. Phys.}},
doc-delivery-number = {{489FL}},
unique-id = {{ISI:000171981300001}}
}
@article{ISI:000089908900012,
author = {Bandilla, A and Drobny, G and Jex, I},
title = {{Parametric down-conversion and maximal pump depletion}},
journal = {{JOURNAL OF OPTICS B-QUANTUM AND SEMICLASSICAL OPTICS}},
year = {{2000}},
volume = {{2}},
number = {{3}},
pages = {{265-270}},
month = {{JUN}},
abstract = {{Using the truncated Wigner function approach and the Bloembergen
solutions for nondegenerate down-conversion we calculate the conversion
efficiency of spontaneous parametric down-conversion. In addition we
determine higher moments of the pump and signal photon number. We find
the upper bound for the efficiency of energy transfer and give a
physically intuitive explanation for its existence. The depletion of the
pump mode is immediately characterized by a strong destruction of its
coherence.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Bandilla, A (Reprint Author), HU Berlin, Inst Phys, AG Nichtkl Strahlung, Invalidenstr 110, D-10115 Berlin, Germany.
HU Berlin, Inst Phys, AG Nichtkl Strahlung, D-10115 Berlin, Germany.
Slovak Acad Sci, Inst Phys, Bratislava 84228, Slovakia.
Czech Tech Univ, FNSPE, Dept Phys, Prague 11519 1, Czech Republic.
Univ Ulm, Abt Quanten Phys, D-89069 Ulm, Germany.}},
doi = {{10.1088/1464-4266/2/3/308}},
issn = {{1464-4266}},
keywords = {{nonlinear optics; parametric down-conversion; process efficiency}},
keywords-plus = {{QUANTUM; PHASE; STATES; FIELD}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Applied}},
number-of-cited-references = {{24}},
times-cited = {{3}},
journal-iso = {{J. Opt. B-Quantum Semicl. Opt.}},
doc-delivery-number = {{364TK}},
unique-id = {{ISI:000089908900012}}
}
@article{ISI:000087275000020,
author = {Jex, I and Alber, G},
title = {{Rotational wavepacket dynamics of the C(60) molecule}},
journal = {{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}},
year = {{2000}},
volume = {{33}},
number = {{8}},
pages = {{1663-1674}},
month = {{APR 28}},
abstract = {{The wavepacket dynamics of (non-stationary) rotational quantum states of
the C(60) molecule are investigated. It is demonstrated that the
icosahedral symmetry of this molecule gives rise to a variety of
peculiar coherence phenomena which are characteristic for this specific
discrete symmetry group. On the one hand, the dynamics of these
wavepackets reflects the underlying classical dynamics on the associated
manifold of group space. On the other hand, these dynamics also exhibit
characteristic quantum features such as the appearance of fractional
revivals, of quantum tunnelling between different classically accessible
regions of the associated manifold of group space and of cat-like
quantum states which are generated in the course of the time evolution.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Jex, I (Reprint Author), Univ Ulm, Abt Quantenopt, Albert Einstein Allee 11, D-89069 Ulm, Germany.
Univ Ulm, Abt Quantenopt, D-89069 Ulm, Germany.
Czech Tech Univ, Dept Phys FJFI, Prague 11519 1, Stare Mesto, Czech Republic.}},
doi = {{10.1088/0953-4075/33/8/315}},
issn = {{0953-4075}},
keywords-plus = {{ICOSAHEDRAL MOLECULES; FINE-STRUCTURE}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{11}},
times-cited = {{1}},
journal-iso = {{J. Phys. B-At. Mol. Opt. Phys.}},
doc-delivery-number = {{318GF}},
unique-id = {{ISI:000087275000020}}
}
@article{ISI:000084746000001,
author = {Torma, P and Jex, I},
title = {{Hamiltonians for Ising-type quantum networks}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{2000}},
volume = {{47}},
number = {{1}},
pages = {{1-10}},
month = {{JAN 15}},
abstract = {{We derive Hamiltonians for quantum networks of Ising-type structure.
These networks can be composed of simple optical elements such as beam
splitters or parameteric amplifiers, similar structures appear also in a
variety of systems with many intersecting energy levels. We give exact
forms for the Hamiltonians and discuss their implications in certain
limits.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Torma, P (Reprint Author), Univ Innsbruck, Inst Theoret Phys, Technikerstr 25, A-6020 Innsbruck, Austria.
Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria.
Univ Ulm, Abt Quantenphys, D-89081 Ulm, Germany.
Univ Innsbruck, Inst Phys Expt, A-6020 Innsbruck, Austria.}},
issn = {{0950-0340}},
keywords-plus = {{LANDAU-ZENER ANTICROSSINGS; TIME-EVOLUTION}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{15}},
times-cited = {{1}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{274CK}},
unique-id = {{ISI:000084746000001}}
}
@article{ISI:000085681600024,
author = {Meneghini, S and Jex, I and van Leeuwen, KAH and Kasimov, MR and
Schleich, WP and Yakovlev, VP},
title = {{Atomic motion in longitudinally modulated light crystals}},
journal = {{LASER PHYSICS}},
year = {{2000}},
volume = {{10}},
number = {{1}},
pages = {{116-122}},
month = {{JAN-FEB}},
abstract = {{We study the dynamics of atomic waves in longitudinally modulated light
crystals using an effective complex potential with time (space)
dependent detuning. In the weak coupling regime we predict a sharp
asymmetry of the scattering probability near the Bragg angle. In the
strong coupling case we introduce the concept of a light crystal with
``complex kick.{''} We have found that the initially blue detuned
crystal is much more transparent for atomic waves. Moreover, the
probability distribution of the outgoing wave shows carpetlike
interference structure.}},
publisher = {{MAIK NAUKA/INTERPERIODICA/SPRINGER}},
address = {{233 SPRING ST, NEW YORK, NY 10013-1578 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Meneghini, S (Reprint Author), Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Univ Ulm, Abt Quantenphys, D-89069 Ulm, Germany.
Czech Tech Univ, Dept Phys, FJFI, Prague, Czech Republic.
Eindhoven Univ Technol, Dept Phys, NL-5600 MB Eindhoven, Netherlands.
Moscow Engn Phys Inst, Moscow 115409, Russia.}},
issn = {{1054-660X}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Applied}},
author-email = {{schleich@physik.uni-ulm.de}},
number-of-cited-references = {{11}},
times-cited = {{4}},
journal-iso = {{Laser Phys.}},
doc-delivery-number = {{290NE}},
unique-id = {{ISI:000085681600024}}
}
@inproceedings{ISI:000165892200071,
author = {Bandilla, A and Drobny, G and Jex, I},
editor = {{Kumar, P and DAriano, GM and Hirota, O}},
title = {{Energy transfer in parametric down-conversion}},
booktitle = {{QUANTUM COMMUNICATION, COMPUTING, AND MEASUREMENT 2}},
year = {{2000}},
pages = {{521-525}},
note = {{4th International Conference on Quantum Communication, Measurement, and
Computing, NORTHWESTERN UNIV, EVANSTON, IL, AUG 22-27, 1998}},
organization = {{Tamagawa Univ; NW Univ; Natl Secur Agcy; USN Off Res}},
publisher = {{KLUWER ACADEMIC/PLENUM PUBL}},
address = {{233 SPRING ST, NEW YORK, NY 10013 USA}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{Bandilla, A (Reprint Author), Humboldt Univ, AG Nichtklass Strahlung, Inst Phys, Invalidenstr 110, D-10115 Berlin, Germany.
Humboldt Univ, AG Nichtklass Strahlung, Inst Phys, D-10115 Berlin, Germany.}},
isbn = {{0-306-46307-5}},
keywords-plus = {{QUANTUM}},
research-areas = {{Computer Science; Engineering; Optics; Physics}},
web-of-science-categories = {{Computer Science, Information Systems; Engineering, Electrical \&
Electronic; Optics; Physics, Mathematical}},
number-of-cited-references = {{15}},
times-cited = {{0}},
doc-delivery-number = {{BR21Y}},
unique-id = {{ISI:000165892200071}}
}
@article{ISI:000079233200064,
author = {Horne, M and Jex, I and Zeilinger, A},
title = {{Schrodinger wave functions in strong periodic potentials with
applications to atom optics}},
journal = {{PHYSICAL REVIEW A}},
year = {{1999}},
volume = {{59}},
number = {{3}},
pages = {{2190-2202}},
month = {{MAR}},
abstract = {{When an atom diffracts in intense standing light, the periodic potential
can be too strong for known solutions of the Schrodinger equation. We
present general solutions of Schrodinger's equation in strong sinusoidal
media, thus generalizing dynamical diffraction theory. The solutions
exhibit rich generalizations of the pendellosung phenomena.
{[}S1050-2947(99)01203-2].}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Horne, M (Reprint Author), Stonehill Coll, N Easton, MA 02357 USA.
Stonehill Coll, N Easton, MA 02357 USA.
Czech Tech Univ, Fak Jaderna \& Fyz Inzenyrska, Prague 11519 1, Stare Mesto, Czech Republic.
Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria.}},
doi = {{10.1103/PhysRevA.59.2190}},
issn = {{1050-2947}},
keywords-plus = {{LIGHT}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{14}},
times-cited = {{13}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{177WC}},
unique-id = {{ISI:000079233200064}}
}
@article{ISI:000081422100003,
author = {Torma, P and Jex, I},
title = {{Properties of Ising-type linear networks}},
journal = {{JOURNAL OF OPTICS B-QUANTUM AND SEMICLASSICAL OPTICS}},
year = {{1999}},
volume = {{1}},
number = {{1}},
pages = {{8-13}},
month = {{FEB}},
abstract = {{We study some of the mathematical properties of quantum networks with
Ising-type nearest-neighbour structure. Based on the formal properties
the physical behaviour of the network, such as destructive and
constructive interference, is discussed.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Torma, P (Reprint Author), Univ Innsbruck, Inst Expt Phys, Technikerstr 25, A-6020 Innsbruck, Austria.
Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria.
Czech Tech Univ, Dept Phys, FNSPE, Prague 11519 1, Czech Republic.
Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria.}},
doi = {{10.1088/1464-4266/1/1/002}},
issn = {{1464-4266}},
keywords = {{Ising model; linear quantum networks}},
keywords-plus = {{LANDAU-ZENER ANTICROSSINGS; TIME EVOLUTION; QUANTUM; PHASE}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Applied}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{21}},
times-cited = {{10}},
journal-iso = {{J. Opt. B-Quantum Semicl. Opt.}},
doc-delivery-number = {{216CC}},
unique-id = {{ISI:000081422100003}}
}
@article{ISI:000078407200002,
author = {Konopka, M and Jex, I},
title = {{Exact solutions for nonlinear Hamiltonians}},
journal = {{CZECHOSLOVAK JOURNAL OF PHYSICS}},
year = {{1998}},
volume = {{48}},
number = {{12}},
pages = {{1537-1553}},
month = {{DEC}},
abstract = {{We find the eigenvalues and eigenvectors of two nonlinear Hamiltonians
describing the interaction between a two-level system and a quantized
linear harmonic oscillator. In the first case we obtain exact isolated
solutions for the Hamiltonian used as a model of an ion in a harmonic
trap and interacting with a laser field, not restricted to the
Lamb-Dicke limit. After projecting these eigenstates onto one of the
levels of the two-level system the oscillator state is described by a
finite superposition of Fock states. In the second case me consider a
Hamiltonian, with a squeeze operator in the interaction part. We give
perturbation results in the weak-coupling limit and results obtained by
numerical diagonalization for the strong coupling limit. Non-classical
results are pointed out also in this case.}},
publisher = {{CZECHOSLOVAK JNL OF PHYSICS}},
address = {{FYZIKALNI USTAV AV NA SLOVANCE 2, PRAGUE 180 40, CZECH REPUBLIC}},
type = {{Article}},
language = {{English}},
affiliation = {{Konopka, M (Reprint Author), Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, Brehova 7, CR-11519 Prague, Czech Republic.
Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Czech Republic.
Slovak Acad Sci, Inst Phys, Bratislava 84228, Slovakia.
Comenius Univ, Fac Math \& Phys, Dept Opt, Bratislava 84215, Slovakia.}},
doi = {{10.1023/A:1022866722760}},
issn = {{0011-4626}},
keywords-plus = {{2-LEVEL SYSTEM; QUANTUM}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
author-email = {{konopka@fmph.uniba.sk
jex@br.fjfi.cvut.cz}},
number-of-cited-references = {{22}},
times-cited = {{0}},
journal-iso = {{Czech. J. Phys.}},
doc-delivery-number = {{163LN}},
unique-id = {{ISI:000078407200002}}
}
@article{ISI:000076960300017,
author = {Bandilla, A and Drobny, G and Jex, I},
title = {{The classical parametric approximation for three-wave interactions}},
journal = {{OPTICS COMMUNICATIONS}},
year = {{1998}},
volume = {{156}},
number = {{1-3}},
pages = {{112-122}},
month = {{NOV 1}},
abstract = {{We study sufficient conditions for the applicability of the classical
parametric approximation in three-wave interactions when the pump
intensity is very large compared to signal and idler intensity. To
derive such conditions we express the exact classical solutions given by
Jacobian elliptic functions in terms of hyperbolic functions. Thereby
the first minimum of the pump intensity is correctly described but the
periodicity is lost. We derive new approximations for the initial
conditions using pump coordinate scaling and find the interval that
defines complete pump depletion. We show that the classical parametric
approximation with a fixed and sharp pump amplitude and phase can be
used for an increasing fraction of this interval if the pump intensity
is made to grow. By choosing higher and higher pump intensities the
nonlinearity is shifted to the end of that interval. As an instructive
example for the application of these findings the generation of two-mode
squeezing is briefly considered. (C) 1998 Elsevier Science B.V. All
rights reserved.}},
publisher = {{ELSEVIER SCIENCE BV}},
address = {{PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}},
type = {{Article}},
language = {{English}},
affiliation = {{Bandilla, A (Reprint Author), Humboldt Univ, Lehrstuhl Nichtklass Strahlung, Rudower Chaussee 5,Haus 10-16, D-12484 Berlin, Germany.
Humboldt Univ, Lehrstuhl Nichtklass Strahlung, D-12484 Berlin, Germany.
Slovak Acad Sci, Inst Phys, Bratislava 84228, Slovakia.
Czech Tech Univ, Fac Nucl Sci \& Phys Engn, Dept Phys, CR-11519 Prague, Czech Republic.}},
doi = {{10.1016/S0030-4018(98)00404-0}},
issn = {{0030-4018}},
keywords-plus = {{AMPLIFIER; PUMP}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{16}},
times-cited = {{8}},
journal-iso = {{Opt. Commun.}},
doc-delivery-number = {{138FH}},
unique-id = {{ISI:000076960300017}}
}
@inproceedings{ISI:000076377700116,
author = {Bandilla, A and Drobny, G and Jex, I},
editor = {{Kasperkovitz, P and Grau, D}},
title = {{Quantum description of nonlinearly coupled oscillators via classical
trajectories}},
booktitle = {{5TH WIGNER SYMPOSIUM, PROCEEDINGS}},
year = {{1998}},
pages = {{389-391}},
note = {{5th Wigner Symposium, VIENNA, AUSTRIA, AUG 25-29, 1997}},
abstract = {{We discuss the usefulness of the Wigner function description via
classical trajectories in the example of the three-wave interaction with
a strong coherent pump.}},
publisher = {{WORLD SCIENTIFIC PUBL CO PTE LTD}},
address = {{PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{Bandilla, A (Reprint Author), Humboldt Univ, Lehrstuhl Nichtklass Strahlung, D-2484 Berlin, Germany.
Humboldt Univ, Lehrstuhl Nichtklass Strahlung, D-2484 Berlin, Germany.}},
isbn = {{981-02-3464-3}},
research-areas = {{Mathematics; Physics}},
web-of-science-categories = {{Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical}},
number-of-cited-references = {{0}},
times-cited = {{0}},
doc-delivery-number = {{BL70A}},
unique-id = {{ISI:000076377700116}}
}
@article{ISI:000071541000005,
author = {Tittonen, I and Stenholm, S and Jex, I},
title = {{Stepwise phase modulation of atoms coupled to a quasi-continuum of
states in a cavity}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1998}},
volume = {{45}},
number = {{1}},
pages = {{23-33}},
month = {{JAN}},
abstract = {{We study the interaction of a small number of resonant two-level atoms
in a cavity coupled to a quasi-continuum of cavity modes. During the
interaction we induce externally a phase step to one of the atoms. As a
result an enhancement in the photon emission to the field is observed.
The phase step is obtained by a pulse which causes the atom to be
off-resonance for a short lime interval. The effect is strongest in
cases where the number of atoms is small. The enhancement is not
restricted to a small parameter range but should be observable in many
systems even though the pi phase shift gives the best enhancement.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{Tittonen, I (Reprint Author), Univ Konstanz, Fak Phys, M 696, D-78434 Constance, Germany.
Univ Helsinki, Theoret Phys Res Inst, FIN-00014 Helsinki, Finland.
Humboldt Univ, Max Planck Gesell, Arbeitsgrp Nichtklass Strahlung, D-12484 Berlin, Germany.}},
issn = {{0950-0340}},
keywords-plus = {{GAMMA-ECHO; PHOTOEXCITATION; RECURRENCES}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Tittonen, Ilkka/C-6649-2013}},
orcid-numbers = {{Tittonen, Ilkka/0000-0002-2985-9789}},
number-of-cited-references = {{16}},
times-cited = {{2}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{YR883}},
unique-id = {{ISI:000071541000005}}
}
@article{ISI:A1997YH58600028,
author = {Paul, H and Torma, P and Kiss, T and Jex, I},
title = {{Two-mode state reconstruction using photon chopping}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1997}},
volume = {{44}},
number = {{11-12}},
pages = {{2395-2404}},
month = {{NOV-DEC}},
abstract = {{The reconstruction of the complete quantum state of a pure-state
two-mode field is shown to be possible by the photon-chopping method,
that is, by spreading the signal with balanced multiports over an array
of detectors and by measuring coincidences. In particular, correlations
between the two modes can be detected with high efficiency.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{Paul, H (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ABREITSGRP NICHTKLASS STRAHLUNG,RUDOWER CHAUSSEE 5,D-12484 BERLIN,GERMANY.
UNIV ULM,ABT QUANTENPHYS,D-89069 ULM,GERMANY.
HUNGARIAN ACAD SCI,CRYSTAL PHYS RES LAB,H-1502 BUDAPEST,HUNGARY.
SLOVAK ACAD SCI,INST PHYS,BRATISLAVA 84228,SLOVAKIA.
CZECH TECH UNIV,FAC NUCL SCI \& PHYS ENGN,DEPT PHYS,PRAGUE 11519 1,CZECH REPUBLIC.}},
issn = {{0950-0340}},
keywords-plus = {{OPTICAL HOMODYNE TOMOGRAPHY; QUANTUM-STATE; DENSITY-MATRIX; LIGHT;
STATISTICS; NUMBER; PHASE; VACUUM}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{31}},
times-cited = {{5}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{YH586}},
unique-id = {{ISI:A1997YH58600028}}
}
@article{ISI:A1997YF52900087,
author = {Paul, H and Torma, P and Kiss, T and Jex, I},
title = {{Multiple coincidences and the quantum state reconstruction problem}},
journal = {{PHYSICAL REVIEW A}},
year = {{1997}},
volume = {{56}},
number = {{5}},
pages = {{4076-4085}},
month = {{NOV}},
abstract = {{We analyze the recently proposed method {[}H. Paul et al., Phys. Rev.
Lett. 76, 2464 (1996)] for reconstructing the quantum state of a light
field from multiple coincidences measured at the outputs of a passive
multiport. We show that applying a large multiport the reconstruction of
a pure state becomes possible using avalanche photodiode-type detectors.
The presented simulations show that the photon chopping scheme is
appropriate for the indirect measurement of the photon statistics of a
weak nonclassical signal. {[}S1050-2947(97)07507-0].}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Paul, H (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASS STRAHLUNG,RUDOWER CHAUSSEE 5,D-12484 BERLIN,GERMANY.
UNIV HELSINKI,THEORET PHYS RES INST,FIN-00014 HELSINKI,FINLAND.
UNIV ULM,ABT QUANTENPHYS,D-89069 ULM,GERMANY.
HUNGARIAN ACAD SCI,CRYSTAL PHYS RES LAB,H-1502 BUDAPEST,HUNGARY.
SLOVAK ACAD SCI,INST PHYS,BRATISLAVA 84228,SLOVAKIA.
CZECH TECH UNIV,FAC NUCL SCI \& PHYS ENGN,DEPT PHYS,CR-11519 PRAGUE,CZECH REPUBLIC.}},
doi = {{10.1103/PhysRevA.56.4076}},
issn = {{1050-2947}},
keywords-plus = {{OPTICAL HOMODYNE TOMOGRAPHY; DENSITY-MATRIX; PHASE-SPACE; SQUEEZED
VACUUM; PHOTON-NUMBER; WAVE-FUNCTION; DISTRIBUTIONS; STATISTICS;
ENDOSCOPY; MECHANICS}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{39}},
times-cited = {{7}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{YF529}},
unique-id = {{ISI:A1997YF52900087}}
}
@article{ISI:A1997WZ59000002,
author = {Torma, P and Jex, I},
title = {{Two-mode entanglement in passive networks}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1997}},
volume = {{44}},
number = {{5}},
pages = {{875-882}},
month = {{MAY}},
abstract = {{We discuss the degree of entanglement for symmetric passive optical
networks. As a measure of the entanglement we use the information
entropy and compare our results for a general number N of inputs with
the known results for a two-mode beam splitter. Special cases of
interest are pointed out.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{Torma, P (Reprint Author), UNIV HELSINKI,RES INST THEORET PHYS,POB 9,SILTAVUORENPENGER 20C,FIN-00014 HELSINKI,FINLAND.}},
doi = {{10.1080/095003497153527}},
issn = {{0950-0340}},
keywords-plus = {{BEAM SPLITTER; PHOTON STATISTICS; QUANTUM-OPTICS; INPUT; SYSTEMS; STATES}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{25}},
times-cited = {{3}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{WZ590}},
unique-id = {{ISI:A1997WZ59000002}}
}
@article{ISI:A1997WB98000013,
author = {Drobny, G and Bandilla, A and Jex, I},
title = {{Quantum description of nonlinearly interacting oscillators via classical
trajectories}},
journal = {{PHYSICAL REVIEW A}},
year = {{1997}},
volume = {{55}},
number = {{1}},
pages = {{78-93}},
month = {{JAN}},
abstract = {{We investigate systems of few harmonic oscillators with mutual nonlinear
coupling. Using classical trajectories-the solutions of Hamiltonian
equations of motion for a given nonlinear system-we construct the
approximate quasiprobability distribution function in phase space that
enables a quantum description. The nonclassical effects (quantum noise
reduction) and their scaling laws can be so studied for high excitation
numbers. In particular, the harmonic oscillators represent modes of the
electromagnetic field and the Hamiltonians under consideration describe
representative nonlinear optical processes (multiwave mixings). The
range of the validity of the approximation for Wigner and Husimi
functions evolved within the classical Liouville equation is discussed
for a diverse class of initial conditions, including those without
classical counterparts, e.g., Fock states.}},
publisher = {{AMER PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Drobny, G (Reprint Author), HUMBOLDT UNIV BERLIN, MAX PLANCK GESELL, AG NICHTKLASS STRAHLUNG, RUDOWER CHAUSSEE 5, BERLIN, GERMANY.
CZECH TECH UNIV, FJFI, DEPT PHYS, PRAGUE 11519 1, CZECH REPUBLIC.
SLOVAK ACAD SCI, INST PHYS, BRATISLAVA 84228, SLOVAKIA.}},
doi = {{10.1103/PhysRevA.55.78}},
issn = {{1050-2947}},
keywords-plus = {{PHOTON DOWN-CONVERSION; PARAMETRIC OSCILLATOR; PHASE-SPACE; 2ND-HARMONIC
GENERATION; ANHARMONIC-OSCILLATOR; LANGEVIN EQUATION; FLUCTUATIONS;
AMPLIFIER; STATES; PUMP}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{61}},
times-cited = {{23}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{WB980}},
unique-id = {{ISI:A1997WB98000013}}
}
@article{ISI:A1996VQ69600015,
author = {Torma, P and Jex, I},
title = {{Plate beam splitters and symmetric multiports}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1996}},
volume = {{43}},
number = {{11}},
pages = {{2403-2408}},
month = {{NOV}},
abstract = {{We show that for experimental arrangements with few nonvacuum inputs the
fully symmetric multiport can be replaced by a simpler partially
symmetric multiport. This device is equivalent to a beam splitter
arrangement where the number of necessary beam splitters increases
linearly with increasing number of inputs, that is it is considerably
simpler to realize owning to the smaller number of components needed.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{Torma, P (Reprint Author), UNIV HELSINKI,THEORET PHYS RES INST,POB 9 SILTAVUORENPENGER 20C,FIN-00014 HELSINKI,FINLAND.}},
doi = {{10.1080/095003496154635}},
issn = {{0950-0340}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{15}},
times-cited = {{10}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{VQ696}},
unique-id = {{ISI:A1996VQ69600015}}
}
@article{ISI:A1996UY52400023,
author = {Bandilla, A and Drobny, G and Jex, I},
title = {{Phase-space motion in parametric three-wave interaction}},
journal = {{OPTICS COMMUNICATIONS}},
year = {{1996}},
volume = {{128}},
number = {{4-6}},
pages = {{353-362}},
month = {{JUL 15}},
abstract = {{We study the interaction of three modes in phi((2)) media in the
classical as well as in the quantum picture. We show that it is possible
to distinguish two basic forms of phase-space motion depending on the
value of the integral of motion Gamma in the classical formulation or
the (initial) mean value of the interaction Hamiltonian in the quantum
formulation. The quantum and classical pictures are compared using a
simulation of the Husimi Q function via classical trajectories for an
ensemble of phase-space points. The very good correspondence between the
two pictures is shown to last for a significant interaction time and can
be investigated for arbitrary initial intensities.}},
publisher = {{ELSEVIER SCIENCE BV}},
address = {{PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}},
type = {{Article}},
language = {{English}},
affiliation = {{Bandilla, A (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTLASS STRAHLUNG,RUDOWER CHAUSSEE 5,D-12484 BERLIN,GERMANY.
SLOVAK ACAD SCI,INST PHYS,BRATISLAVA 84228,SLOVAKIA.}},
doi = {{10.1016/0030-4018(96)00136-8}},
issn = {{0030-4018}},
keywords-plus = {{QUANTUM; AMPLIFICATION; CONVERSION; AMPLIFIER; STATE; MODE}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{33}},
times-cited = {{13}},
journal-iso = {{Opt. Commun.}},
doc-delivery-number = {{UY524}},
unique-id = {{ISI:A1996UY52400023}}
}
@article{ISI:A1996UC77700015,
author = {Paul, H and Torma, P and Kiss, T and Jex, I},
title = {{Photon chopping: New way to measure the quantum state of light}},
journal = {{PHYSICAL REVIEW LETTERS}},
year = {{1996}},
volume = {{76}},
number = {{14}},
pages = {{2464-2467}},
month = {{APR 1}},
abstract = {{We propose the use of a balanced 2N-port as a technique to measure the
pure quantum state of a single-mode light field. In our scheme the
coincidence signals of simple, realistic photodetectors are recorded at
the output of the 2N-port. We show that applying different arrangements
both the modulus and the phase of the coefficients in a finite
superposition state can be measured. In particular, the photon
statistics can be so measured with currently available devices.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Paul, H (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASS STRAHLUNG,RUDOWER CHAUSSEE 5,D-12484 BERLIN,GERMANY.
UNIV HELSINKI,THEORET PHYS RES INST,SF-00014 HELSINKI,FINLAND.
HUNGARIAN ACAD SCI,CRYSTAL PHYS RES LAB,H-1502 BUDAPEST,HUNGARY.
SLOVAK ACAD SCI,INST PHYS,BRATISLAVA 84228,SLOVAKIA.
CZECH TECH UNIV,FAC NUCL SCI \& PHYS ENGN,DEPT PHYS,CR-11519 PRAGUE,CZECH REPUBLIC.}},
doi = {{10.1103/PhysRevLett.76.2464}},
issn = {{0031-9007}},
keywords-plus = {{OPTICAL HOMODYNE TOMOGRAPHY; PHASE; DISTRIBUTIONS}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
researcherid-numbers = {{Kiss, Tamas/B-9228-2009
Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{22}},
times-cited = {{94}},
journal-iso = {{Phys. Rev. Lett.}},
doc-delivery-number = {{UC777}},
unique-id = {{ISI:A1996UC77700015}}
}
@article{ISI:A1996UE67100014,
author = {Tittonen, I and Stenholm, S and Jex, I},
title = {{Effect of a phase step on two-level atoms in a cavity}},
journal = {{OPTICS COMMUNICATIONS}},
year = {{1996}},
volume = {{124}},
number = {{3-4}},
pages = {{271-276}},
month = {{MAR 1}},
abstract = {{We analyze the dynamics of an excited two-level atom in the presence of
other deexcited atoms in a cavity. We show, that due to an instantaneous
phase shift experienced by one of the atoms, the probability for
emitting a photon into the cavity can be increased. In the special case
of only two atoms in the cavity we show that the system with certainty
can release a photon that is otherwise partially trapped.}},
publisher = {{ELSEVIER SCIENCE BV}},
address = {{PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}},
type = {{Article}},
language = {{English}},
affiliation = {{ACAD FINLAND,TURKU,FINLAND.
UNIV HELSINKI,THEORET PHYS RES INST,SF-00014 HELSINKI,FINLAND.
HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASS STRAHLUNG,D-12484 BERLIN,GERMANY.}},
doi = {{10.1016/0030-4018(95)00700-8}},
issn = {{0030-4018}},
keywords-plus = {{SPONTANEOUS EMISSION; GAMMA-ECHO; ENTANGLEMENT}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Tittonen, Ilkka/C-6649-2013}},
orcid-numbers = {{Tittonen, Ilkka/0000-0002-2985-9789}},
number-of-cited-references = {{15}},
times-cited = {{8}},
journal-iso = {{Opt. Commun.}},
doc-delivery-number = {{UE671}},
unique-id = {{ISI:A1996UE67100014}}
}
@article{ISI:A1996TZ55100004,
author = {Torma, P and Jex, I and Stenholm, S},
title = {{Beam splitter realizations of totally symmetric mode couplers}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1996}},
volume = {{43}},
number = {{2}},
pages = {{245-251}},
month = {{FEB}},
abstract = {{We discuss the symmetric multiport and show in a constructive way how it
can be decomposed into a set of beam splitters. Based on the
decomposition we estimate the number of beam splitters needed. It is
shown that for more than three input ports the number of beam splitters
needed is less than the number indicated by the standard decomposition
scheme.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{Torma, P (Reprint Author), UNIV HELSINKI,THEORET PHYS RES INST,SILTAVUORENPENGER 20C,SF-00014 HELSINKI,FINLAND.
ACAD FINLAND,HELSINKI,FINLAND.}},
doi = {{10.1080/095003496156129}},
issn = {{0950-0340}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{14}},
times-cited = {{17}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{TZ551}},
unique-id = {{ISI:A1996TZ55100004}}
}
@inproceedings{ISI:A1996BG08Q00081,
author = {Torma, P and Stenholm, S and Jex, I},
editor = {{Eberly, JH and Mandel, L and Wolf, E}},
title = {{Quantum theory of optical networks}},
booktitle = {{COHERENCE AND QUANTUM OPTICS VII}},
year = {{1996}},
pages = {{415-416}},
note = {{7th Rochester Conference on Coherence and Quantum Optics, UNIV
ROCHESTER, ROCHESTER, NY, JUN 07-10, 1995}},
organization = {{Amer Phys Soc; Opt Soc Amer; Int Union Pure \& Appl Phys; Univ Rochester}},
publisher = {{PLENUM PRESS DIV PLENUM PUBLISHING CORP}},
address = {{233 SPRING ST, NEW YORK, NY 10013}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{UNIV HELSINKI,THEORET PHYS RES INST,FIN-00014 HELSINKI,FINLAND.}},
isbn = {{0-306-45314-2}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Applied}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{0}},
times-cited = {{0}},
doc-delivery-number = {{BG08Q}},
unique-id = {{ISI:A1996BG08Q00081}}
}
@inproceedings{ISI:A1996BG08Q00088,
author = {Bandilla, A and Drobny, G and Jex, I},
editor = {{Eberly, JH and Mandel, L and Wolf, E}},
title = {{Three-wave mixing with entangled and disentangled states}},
booktitle = {{COHERENCE AND QUANTUM OPTICS VII}},
year = {{1996}},
pages = {{429-430}},
note = {{7th Rochester Conference on Coherence and Quantum Optics, UNIV
ROCHESTER, ROCHESTER, NY, JUN 07-10, 1995}},
organization = {{Amer Phys Soc; Opt Soc Amer; Int Union Pure \& Appl Phys; Univ Rochester}},
publisher = {{PLENUM PRESS DIV PLENUM PUBLISHING CORP}},
address = {{233 SPRING ST, NEW YORK, NY 10013}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{HUMBOLDT UNIV BERLIN,D-12484 BERLIN,GERMANY.}},
isbn = {{0-306-45314-2}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Applied}},
number-of-cited-references = {{0}},
times-cited = {{0}},
doc-delivery-number = {{BG08Q}},
unique-id = {{ISI:A1996BG08Q00088}}
}
@inproceedings{ISI:A1996BG08Q00208,
author = {Leonhardt, U and Jex, I},
editor = {{Eberly, JH and Mandel, L and Wolf, E}},
title = {{Quantum-state tomography and quantum communication}},
booktitle = {{COHERENCE AND QUANTUM OPTICS VII}},
year = {{1996}},
pages = {{675-676}},
note = {{7th Rochester Conference on Coherence and Quantum Optics, UNIV
ROCHESTER, ROCHESTER, NY, JUN 07-10, 1995}},
organization = {{Amer Phys Soc; Opt Soc Amer; Int Union Pure \& Appl Phys; Univ Rochester}},
publisher = {{PLENUM PRESS DIV PLENUM PUBLISHING CORP}},
address = {{233 SPRING ST, NEW YORK, NY 10013}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASS STRAHLUNG,D-12484 BERLIN,GERMANY.}},
isbn = {{0-306-45314-2}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Applied}},
number-of-cited-references = {{0}},
times-cited = {{0}},
doc-delivery-number = {{BG08Q}},
unique-id = {{ISI:A1996BG08Q00208}}
}
@article{ISI:A1996TR75000062,
author = {Bandilla, A and Drobny, G and Jex, I},
title = {{Nondegenerate parametric interactions and nonclassical effects}},
journal = {{PHYSICAL REVIEW A}},
year = {{1996}},
volume = {{53}},
number = {{1}},
pages = {{507-516}},
month = {{JAN}},
abstract = {{We consider the classical and quantum-mechanical processes of three-wave
interactions in different phase regimes and present numerical
calculations for the quantum case, where all three modes are sizably
excited from the beginning. These excitations are coherent so that
various important phase regimes can be adjusted. In addition, one mode
can also be prepared in a squeezed or Kerr state. The classical
solutions are well known and are briefly summarized, but certain phase
regimes are classically unexplored and we show here that they give
interesting and surprising results. In the out-of-phase regime (where
the photon numbers do not change in the first order of time) we get,
with an initial Kerr state, strongly sub-Poissonian photon statistics in
the signal after a short interaction time. This effect is limited by the
classically described phase shifts that are present even in the
parametric approximation. This nonclassical phenomenon (due to the Kerr
state) helps us to understand similar nonclassical effects generated by
entangled states of the pump and signal during sum-frequency generation.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{Bandilla, A (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASS STRAHLUNG,RUDOWER SHAUSSEE 5,D-12484 BERLIN,GERMANY.
SLOVAK ACAD SCI,INST PHYS,BRATISLAVA 84228,SLOVAKIA.}},
doi = {{10.1103/PhysRevA.53.507}},
issn = {{1050-2947}},
keywords-plus = {{QUANTUM; INTERFEROMETER; AMPLIFICATION}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{20}},
times-cited = {{28}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{TR750}},
unique-id = {{ISI:A1996TR75000062}}
}
@article{ISI:A1995TK65200063,
author = {TORMA, P and STENHOLM, S and JEX, I},
title = {{MEASUREMENT AND PREPARATION USING 2 PROBE MODES}},
journal = {{PHYSICAL REVIEW A}},
year = {{1995}},
volume = {{52}},
number = {{6}},
pages = {{4812-4822}},
month = {{DEC}},
abstract = {{We consider the simultaneous measurement of two conjugate variables by
coupling the system of interest to two independent probe modes. Our
model consists of linearly coupled boson modes that can be realized by
quantum optical fields in the rotating-wave approximation. We approach
the setup both as a device to extract observable information and to
prepare an emerging quantum state. The initial states of the probe modes
and the coupling are utilized to optimize the operation in the various
regimes. In contrast to the Arthurs and Kelly ideal scheme {[}Bell.
Syst. Tech. J. 44, 725 (1965)], our more realistic coupling does not
allow perfect operation but the ideal situations can be approximated
closely. We discuss the conditions for maximum information transfer to
the probe modes, information extraction with minimum disturbance of the
system mode, and optimal state preparation for subsequent measurements.
The minimum disturbance operation can be made to approximate a
nondemolition measurement, especially when the information is carried in
one quadrature component only. In the preparation mode, we find that the
recording accuracy of the probe signals plays an essential role. We
restrict the discussion to the first and second moments only, but the
method can easily be generalized to any situation, Choosing all modes to
be in squeezed coherent states originally, we can carry out analytical
considerations; other cases can be treated numerically. The results are
presented and discussed in detail as the paradigm of a class of
realizable measurements.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{TORMA, P (Reprint Author), UNIV HELSINKI,THEORET PHYS RES INST,POB 9,SF-00014 HELSINKI,FINLAND.
SLOVAK ACAD SCI,INST PHYS,BRATISLAVA 8428,SLOVAKIA.
ACAD FINLAND,SF-00014 HELSINKI,FINLAND.}},
doi = {{10.1103/PhysRevA.52.4812}},
issn = {{1050-2947}},
keywords-plus = {{QUANTUM; PROBABILITY; HOMODYNE; NOISE; PHASE}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{25}},
times-cited = {{16}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{TK652}},
unique-id = {{ISI:A1995TK65200063}}
}
@article{ISI:A1995TK65200067,
author = {TORMA, P and STENHOLM, S and JEX, I},
title = {{HAMILTONIAN THEORY OF SYMMETRICAL OPTICAL NETWORK TRANSFORMS}},
journal = {{PHYSICAL REVIEW A}},
year = {{1995}},
volume = {{52}},
number = {{6}},
pages = {{4853-4860}},
month = {{DEC}},
abstract = {{We discuss the theory of extracting an interaction Hamiltonian from a
preassigned unitary transformation of quantum states. Such a procedure
is of significance in quantum computations and other optical information
processing tasks. We particularize the problem to the construction of
totally symmetric 2N peas as introduced by Zeilinger and his
collaborators {[}A. Zeilinger, M. Zukowski, M. A. Home, H. J. Bernstein,
and D. M. Greenberger, in Fundamental Aspects of Quantum Theory, edited
by J. Anandan and J. J. Safko (World Scientific, Singapore, 1994)].
These are realized by the discrete Fourier transform,which simplifies
the construction of the Hamiltonian by known methods of Linear algebra.
The Hamiltonians found are discussed and alternative realizations of the
Zeilinger class transformations are presented. We briefly discuss the
applicability of the method to more general devices.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{TORMA, P (Reprint Author), THEORET PHYS RES INST,POB 9,SILTAVUORENPENGER 20C,SF-00014 HELSINKI,FINLAND.
ACAD FINLAND,SF-00014 HELSINKI,FINLAND.}},
doi = {{10.1103/PhysRevA.52.4853}},
issn = {{1050-2947}},
keywords-plus = {{QUANTUM}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{20}},
times-cited = {{37}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{TK652}},
unique-id = {{ISI:A1995TK65200067}}
}
@article{ISI:A1995TF68400013,
author = {BANDILLA, A and DROBNY, G and JEX, I},
title = {{SUB-POISSONIAN PHOTON STATISTICS IN A 3-WAVE INTERACTION STARTING IN THE
OUT-OF-PHASE REGIME}},
journal = {{PHYSICAL REVIEW LETTERS}},
year = {{1995}},
volume = {{75}},
number = {{22}},
pages = {{4019-4022}},
month = {{NOV 27}},
abstract = {{We present for the first time numerical and analytical calculations for
the nonlinear interaction of three quantized waves all sizably excited
from the beginning and having different phase relations. With a
Kerr-state ansatz for the signal we get strongly sub-Poissonian photon
statistics and conclude on similar effects by initially entangled
states.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{BANDILLA, A (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,AKTIENGESELL NICHTKLASS STRAHLUNG,RUDOWER CHAUSSEE 5,D-12484 BERLIN,GERMANY.
SLOVAK ACAD SCI,INST PHYS,BRATISLAVA 84228,SLOVAKIA.}},
doi = {{10.1103/PhysRevLett.75.4019}},
issn = {{0031-9007}},
keywords-plus = {{QUANTUM; INTERFEROMETER}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
number-of-cited-references = {{17}},
times-cited = {{11}},
journal-iso = {{Phys. Rev. Lett.}},
doc-delivery-number = {{TF684}},
unique-id = {{ISI:A1995TF68400013}}
}
@article{ISI:A1995RH41800004,
author = {JEX, I and TORMA, P and STENHOLM, S},
title = {{MULTIMODE COHERENT STATES}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1995}},
volume = {{42}},
number = {{7}},
pages = {{1377-1386}},
month = {{JUL}},
abstract = {{We define multimode (entangled) coherent states as properly chosen
linear superpositions of suitable composition states. Our definition is
equivalent to the definition of coherent states as eigenvectors of a
corresponding generalized annihilation operator. In certain limit cases
we discuss the statistical properties of the states defined.}},
publisher = {{TAYLOR \& FRANCIS LTD LONDON}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), HELSINKI UNIV,THEORET PHYS RES INST,POB 9,SILTAVUORENPENGER 20 C,SF-00014 HELSINKI,FINLAND.
SLOVAK ACAD SCI,INST PHYS,BRATISLAVA 84228,SLOVAKIA.}},
doi = {{10.1080/09500349514551211}},
issn = {{0950-0340}},
keywords-plus = {{PHOTON STATISTICS; SUPERPOSITION; GENERATION}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Torma, Paivi/E-7359-2012}},
number-of-cited-references = {{20}},
times-cited = {{13}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{RH418}},
unique-id = {{ISI:A1995RH41800004}}
}
@article{ISI:A1995QZ35600018,
author = {JEX, I and STENHOLM, S and ZEILINGER, A},
title = {{HAMILTONIAN THEORY OF A SYMMETRICAL MULTIPORT}},
journal = {{OPTICS COMMUNICATIONS}},
year = {{1995}},
volume = {{117}},
number = {{1-2}},
pages = {{95-101}},
month = {{MAY 15}},
abstract = {{We analyze a simple Hamiltonian model for a passive multiport. We show
that such a model can be made symmetric with respect to the outputs for
certain (interaction) times up to a certain number of input-output
ports. The limit of infinitely many input-output channels is discussed.}},
publisher = {{ELSEVIER SCIENCE BV}},
address = {{PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), UNIV HELSINKI, INST THEORET PHYS, POB 9, SILTAVUORENPENGER 20B, SF-00017 HELSINKI, FINLAND.
UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA.
SLOVAK ACAD SCI, INST PHYS, CS-84228 BRATISLAVA, SLOVAKIA.}},
doi = {{10.1016/0030-4018(95)00078-M}},
issn = {{0030-4018}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{10}},
times-cited = {{37}},
journal-iso = {{Opt. Commun.}},
doc-delivery-number = {{QZ356}},
unique-id = {{ISI:A1995QZ35600018}}
}
@inproceedings{ISI:A1995BE62U00015,
author = {Bandilla, A and Drobny, G and Jex, I},
editor = {{Betak, E}},
title = {{Three-wave mixing with entangled and disentangled states}},
booktitle = {{ACTA PHYSICA SLOVACA, VOL 45, NO 3, JUNE 1995}},
year = {{1995}},
pages = {{335-340}},
note = {{3rd Central-European Workshop on Quantum Optics, BUDMERICE CASTLE,
SLOVAKIA, APR 28-MAY 01, 1995}},
publisher = {{SLOVAK ACADEMY SCIENCES INSTITUTE PHYSICS}},
address = {{DUBRAVSKA CESTA 9, 842 28 BRATISLAVA, SLOVAKIA}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASS STRAHLUNG,D-12484 BERLIN,GERMANY.}},
research-areas = {{Mechanics; Optics; Physics}},
web-of-science-categories = {{Mechanics; Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{0}},
times-cited = {{0}},
doc-delivery-number = {{BE62U}},
unique-id = {{ISI:A1995BE62U00015}}
}
@inproceedings{ISI:A1995BE62U00017,
author = {Drobny, G and Jex, I},
editor = {{Betak, E}},
title = {{Field state manipulation using a multiatomic system}},
booktitle = {{ACTA PHYSICA SLOVACA, VOL 45, NO 3, JUNE 1995}},
year = {{1995}},
pages = {{347-351}},
note = {{3rd Central-European Workshop on Quantum Optics, BUDMERICE CASTLE,
SLOVAKIA, APR 28-MAY 01, 1995}},
publisher = {{SLOVAK ACADEMY SCIENCES INSTITUTE PHYSICS}},
address = {{DUBRAVSKA CESTA 9, 842 28 BRATISLAVA, SLOVAKIA}},
type = {{Proceedings Paper}},
language = {{English}},
affiliation = {{SAS,INST PHYS,BRATISLAVA 84225,SLOVAKIA.}},
research-areas = {{Mechanics; Optics; Physics}},
web-of-science-categories = {{Mechanics; Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{0}},
times-cited = {{0}},
doc-delivery-number = {{BE62U}},
unique-id = {{ISI:A1995BE62U00017}}
}
@article{ISI:A1994QD47300006,
author = {JEX, I and ORLOWSKI, A},
title = {{WEHRLS ENTROPY DYNAMICS IN A KERR-LIKE MEDIUM}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1994}},
volume = {{41}},
number = {{12}},
pages = {{2301-2306}},
month = {{DEC}},
abstract = {{We report on the time evolution of the Wehrl entropy in a Kerr-like
medium. We show that the Wehrl entropy gives a clear signature for the
formation of finite superpositions of coherent states (cat-like states).
In addition, the actual value of the Wehrl entropy at the time of a
superposition formation gives the number of coherent components taking
part in the superposition.}},
publisher = {{TAYLOR \& FRANCIS LTD LONDON}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASSISCHE STRAHLUNG,RUDOWER CHAUSSEE 5,D-12489 BERLIN,GERMANY.
POLISH ACAD SCI,INST FIZ,PL-02668 WARSAW,POLAND.}},
doi = {{10.1080/09500349414552151}},
issn = {{0950-0340}},
keywords-plus = {{SCHRODINGER-CAT STATES; JAYNES-CUMMINGS MODEL; QUANTUM STATES;
SUPERPOSITIONS}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
researcherid-numbers = {{Orlowski, Arkadiusz/A-6443-2008}},
number-of-cited-references = {{23}},
times-cited = {{25}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{QD473}},
unique-id = {{ISI:A1994QD47300006}}
}
@article{ISI:A1994PM52700003,
author = {DROBNY, G and JEX, I},
title = {{NONDEGENERATE 2-PHOTON DOWN-CONVERSION - COHERENT INPUTS AND
NONCLASSICAL EFFECTS}},
journal = {{CZECHOSLOVAK JOURNAL OF PHYSICS}},
year = {{1994}},
volume = {{44}},
number = {{9}},
pages = {{827-842}},
month = {{SEP}},
abstract = {{We study the nondegenerate two-photon down conversion described by a
quantum trilinear Hamiltonian. The idler mode is initially prepared in
the vacuum while the pump (laser) and the signal mode are prepared in
coherent states which at high intensities resemble classical inputs.
Such setup with a coherent signal mode allows us to scan the dynamics
from the regime of the down conversion (empty signal) up to the
frequency conversion (highly excited signal). The analysis concentrates
on the entanglement properties of the modes which are compared with
their other statistical properties such as squeezing and antibunching to
give a more complete characterization of the modes. We show that the
single mode nonclassical effects (squeezing and antibunching) disappear
when an initial signal intensity highly exceeds that of the pump. In
this regime the numerical results are confirmed by approximate
analytical calculations. We point out that initially comparable
intensities of the signal and pump mode lead to the effect of the
`'spontaneous disentanglement'' of the signal mode from others and to
the production of its squeezed and sub-Poissonian state which is pure to
a good approximation.}},
publisher = {{CZECHOSLOVAK JNL OF PHYSICS}},
address = {{FYZIKALNI USTAV AV NA SLOVANCE 2, PRAGUE, CZECH REPUBLIC 180 40}},
type = {{Article}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,SLOVAKIA.
HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASSICHE STRAHLUNG,O-1199 BERLIN,GERMANY.}},
doi = {{10.1007/BF01787791}},
issn = {{0011-4626}},
keywords-plus = {{JAYNES-CUMMINGS MODEL; DOWN-CONVERSION; PUMP; ENTANGLEMENT; ENTROPY;
STATES; FLUCTUATIONS; RESONANCE; COLLAPSE; REVIVAL}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
number-of-cited-references = {{25}},
times-cited = {{4}},
journal-iso = {{Czech. J. Phys.}},
doc-delivery-number = {{PM527}},
unique-id = {{ISI:A1994PM52700003}}
}
@article{ISI:A1994NA92000010,
author = {LEONHARDT, U and JEX, I},
title = {{WIGNER FUNCTIONS AND QUADRATURE DISTRIBUTIONS FOR QUANTUM-OSCILLATOR
STATES WITH RANDOM-PHASE}},
journal = {{PHYSICAL REVIEW A}},
year = {{1994}},
volume = {{49}},
number = {{3}},
pages = {{R1555-R1557}},
month = {{MAR}},
abstract = {{Applying a result of Vogel and Risken {[}Phys. Rev. A 40, 2847 (1989)]
to quantum-oscillator states with random phase, we found surprisingly
simple integral relations between the Wiper function and the quadrature
distribution. In particular, we have shown that the balance of
increasing and decreasing sections of the quadrature distribution
decides the sign of the Wiper function.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Note}},
language = {{English}},
affiliation = {{LEONHARDT, U (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASSISCHE STRAHLUNG,RUDOWER CHAUSSEE 5,D-12484 BERLIN,GERMANY.}},
issn = {{1050-2947}},
keywords-plus = {{HOMODYNE; NOISE}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{19}},
times-cited = {{16}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{NA920}},
unique-id = {{ISI:A1994NA92000010}}
}
@article{ISI:A1994MT25800082,
author = {DROBNY, G and GANTSOG, T and JEX, I},
title = {{PHASE PROPERTIES OF A FIELD MODE INTERACTING WITH N 2-LEVEL ATOMS}},
journal = {{PHYSICAL REVIEW A}},
year = {{1994}},
volume = {{49}},
number = {{1}},
pages = {{622-625}},
month = {{JAN}},
abstract = {{We analyze the phase properties of a strong cavity field interacting
with an ensemble of initially excited N two-level atoms. Using the
Pegg-Barnett phase formalism {[}Phys. Rev. A 39, 1665 (1989)], we
calculate the phase probability distribution as well as the phase
variance. The phase probability density exhibits a (N + 1)-peak
structure at the initial stages of the evolution. The phase variance is
used to illustrate the progressive randomization of the phase on the
long-time evolution. The difference in the phase dynamics for the N even
and the N odd case is pointed out.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Note}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,SLOVAKIA.
MONGOLIAN STATE UNIV,DEPT THEORET PHYS,ULAANBAATAR 210646,MONGOL PEO REP.
HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASS STRAHLUNG,D-12484 BERLIN,GERMANY.}},
doi = {{10.1103/PhysRevA.49.622}},
issn = {{1050-2947}},
keywords-plus = {{JAYNES-CUMMINGS MODEL; SPONTANEOUS EMISSION; SUPER-RADIANCE; 2-LEVEL
ATOMS; CAVITY; MASER; SYSTEM; EVOLUTION; RADIATION; STATE}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{29}},
times-cited = {{7}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{MT258}},
unique-id = {{ISI:A1994MT25800082}}
}
@article{ISI:A1993MN28100010,
author = {JEX, I and PAUL, H},
title = {{LONG-TIME BEHAVIOR OF THE FIELD IN A LOSSLESS MICROMASER WITH
INTENSITY-DEPENDENT COUPLING-CONSTANT}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1993}},
volume = {{40}},
number = {{12}},
pages = {{2399-2406}},
month = {{DEC}},
abstract = {{Using the asymptotic form of the density matrix the role of the
nondiagonal elements of the density matrix is estimated in the lossless
micromaser model based on the Jaynes-Cummings model with intensity
dependent coupling constant. It is shown that a certain type of a
(almost pure) multiphoton state can be generated in this system.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASS STRAHLUNG,RUDOWER CHAUSEE 5,D-12484 BERLIN,GERMANY.}},
doi = {{10.1080/09500349314552421}},
issn = {{0950-0340}},
keywords-plus = {{JAYNES-CUMMINGS MODEL; MICROSCOPIC MASER; COHERENT STATES; 2-LEVEL ATOM;
QUANTUM; EVOLUTION; REVIVAL; SUPERPOSITIONS; DISSIPATION; GENERATION}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{29}},
times-cited = {{3}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{MN281}},
unique-id = {{ISI:A1993MN28100010}}
}
@article{ISI:A1993MF23900002,
author = {JEX, I and MATSUOKA, M and KOASHI, M},
title = {{PHASE OF THE FIELD IN THE INTERACTION WITH 2 2-LEVEL ATOMS}},
journal = {{QUANTUM OPTICS}},
year = {{1993}},
volume = {{5}},
number = {{5}},
pages = {{275-286}},
month = {{OCT}},
abstract = {{We present phase properties of a field mode interacting with two
two-level atoms using the Pegg and Barnett formalism. We derive
analytical and approximate expressions for the phase probability
distribution, and calculate the mean value of the phase and their
fluctuations. A discussion with respect to the coupling constant of the
atoms is given.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), UNIV TOKYO,INST SOLID STATE PHYS,7-22-1 ROPPONGI,MINATO KU,TOKYO 106,JAPAN.}},
doi = {{10.1088/0954-8998/5/5/002}},
issn = {{0954-8998}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Applied}},
number-of-cited-references = {{0}},
times-cited = {{13}},
doc-delivery-number = {{MF239}},
unique-id = {{ISI:A1993MF23900002}}
}
@article{ISI:A1993LW01700024,
author = {DROBNY, G and JEX, I},
title = {{THE SYSTEM OF N 2-LEVEL ATOMS INTERACTING WITH A FIELD MODE -
ENTANGLEMENT AND PARAMETRIC APPROXIMATION}},
journal = {{OPTICS COMMUNICATIONS}},
year = {{1993}},
volume = {{102}},
number = {{1-2}},
pages = {{141-154}},
month = {{SEP 15}},
abstract = {{We study the entanglement of the cavity field mode to the ensemble of
two-level atoms when their interaction is ruled by the Dicke model. Our
investigation is focused mainly on initial states with fully excited
atomic system and an intense cavity field mode. We give an analysis of
the entanglement on the short as well as the long time scale. We derive
limit expressions for the entanglement for the first moments of the
evolution where the entanglement reaches constant value. We show that in
the early moments of the evolution an almost pure state can be generated
under suitable conditions when the intensity of the field is
approximately N. On the long time scale we point out the appearance of a
clear decrease of the entanglement associated with the collapse-revival
phenomenon of the mean photon number in this model. The bifurcation of
initially a gaussian Q-function of the field mode into N + 1 peaks of
different weight factors is shown. Finally the results known for the
Jaynes-Cummings model are compared with the obtained results.}},
publisher = {{ELSEVIER SCIENCE BV}},
address = {{PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}},
type = {{Article}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.
HUMBOLDT UNIV BERLIN,MAX PLANCK GESELLS,ARBEITSGRP NICHTKLASSISCHE STRAHLUNG,O-1199 BERLIN,GERMANY.}},
doi = {{10.1016/0030-4018(93)90485-N}},
issn = {{0030-4018}},
keywords-plus = {{JAYNES-CUMMINGS MODEL; SPONTANEOUS EMISSION; STATE; RESONANCE; COLLAPSE;
ENTROPY; REVIVAL}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{24}},
times-cited = {{20}},
journal-iso = {{Opt. Commun.}},
doc-delivery-number = {{LW017}},
unique-id = {{ISI:A1993LW01700024}}
}
@article{ISI:A1993LW83800013,
author = {JEX, I},
title = {{REVIVAL TIME-ESTIMATION IN THE PROCESS OF DOWN-CONVERSION}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1993}},
volume = {{40}},
number = {{9}},
pages = {{1753-1761}},
month = {{SEP}},
abstract = {{We analyse the collapse-revival phenomenon in the process of k-photon
down conversion with quantized pump for initial Fock states. We give an
explanation for the appearance of the revivals by analysing the
decomposition of the initial state into the interaction Hamiltonian
eigenvectors. A quantitative estimation of the revival times is given as
well.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), HUMBOLDT UNIV BERLIN,MAX PLANCK GESELL,ARBEITSGRP NICHTKLASS STRAHLUNG,RUDOWER CHAUSSEE 5,O-1199 BERLIN,GERMANY.}},
doi = {{10.1080/09500349314551771}},
issn = {{0950-0340}},
keywords-plus = {{COHERENT STATES; K-PHOTON; COLLAPSE; ATOM; CAVITY; LIGHT; MODEL}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{24}},
times-cited = {{3}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{LW838}},
unique-id = {{ISI:A1993LW83800013}}
}
@article{ISI:A1993LW84500004,
author = {DROBNY, G and JEX, I},
title = {{2-MODE SU(2) COHERENT STATES FOR KAPPA-PHOTON DOWN-CONVERSION PROCESS
WITH QUANTIZED PUMP}},
journal = {{CZECHOSLOVAK JOURNAL OF PHYSICS}},
year = {{1993}},
volume = {{43}},
number = {{8}},
pages = {{797-806}},
month = {{AUG}},
abstract = {{We analyze the statistical properties of the two-mode SU(2) coherent
states associated with the process of k-photon down conversion with
quantized pump. We show that the modes exhibit sub-Poissonian photon
statistics, anticorrelation and in some particular cases also squeezing.
The influence of various initial number states on this effects is
analyzed in detail.}},
publisher = {{CZECHOSLOVAK JNL OF PHYSICS}},
address = {{FYZIKALNI USTAV AV NA SLOVANCE 2, PRAGUE, CZECH REPUBLIC 180 40}},
type = {{Article}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
doi = {{10.1007/BF01589801}},
issn = {{0011-4626}},
keywords-plus = {{FLUCTUATIONS; LIGHT}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
number-of-cited-references = {{28}},
times-cited = {{0}},
journal-iso = {{Czech. J. Phys.}},
doc-delivery-number = {{LW845}},
unique-id = {{ISI:A1993LW84500004}}
}
@article{ISI:A1993LM34100076,
author = {DROBNY, G and JEX, I and BUZEK, V},
title = {{MODE ENTANGLEMENT IN NONDEGENERATE DOWN-CONVERSION WITH QUANTIZED PUMP}},
journal = {{PHYSICAL REVIEW A}},
year = {{1993}},
volume = {{48}},
number = {{1}},
pages = {{569-579}},
month = {{JUL}},
abstract = {{We study entanglement between field modes in the process of
nondegenerate two-photon down-conversion with quantized pump. We show
that due to the quantum nature of the dynamics, strong entanglement
between the pump and the signal-idler subsystems can be observed. We
find that the higher the initial intensity of the pump mode the stronger
the entanglement between the pump and the signal-idler subsystem is
established during the first instants of the time evolution. We also
show that the signal and the idler modes are strongly entangled
(correlated). This entanglement is much stronger than the entanglement
between the pump and the signal-idler subsystem. Correlation between the
signal and the idler modes leads to a high degree of two-mode squeezing,
which can be observed during the first instants of the time evolution
when the pump mode is still approximately in a pure state. On the other
hand, the back action of the signal-idler subsystem on the pump mode
leads to a strong single-mode squeezing of the pump mode. At the time
interval during which squeezing of the pump mode can be observed the
pump mode is far from being in the minimum uncertainty state. We also
analyze the longtime behavior of the quantum-optical system under
consideration and we show that the interesting collapse-revival effect
in the time evolution of the mean photon number and of the purity
parameters of field modes can be observed. Finally, we show that the
degree of entanglement between modes in the nondegenerate
quantum-optical down-conversion strongly depends on the initial state of
the system.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.
WEIZMANN INST SCI,DEPT CHEM PHYS,IL-76100 REHOVOT,ISRAEL.}},
doi = {{10.1103/PhysRevA.48.569}},
issn = {{1050-2947}},
keywords-plus = {{ENTROPY; STATES; GENERATION; PHOTON}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{25}},
times-cited = {{32}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{LM341}},
unique-id = {{ISI:A1993LM34100076}}
}
@article{ISI:A1993LG39900003,
author = {JEX, I and BUZEK, V},
title = {{MULTIPHOTON COHERENT STATES AND THE LINEAR SUPERPOSITION PRINCIPLE}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1993}},
volume = {{40}},
number = {{5}},
pages = {{771-783}},
month = {{MAY}},
abstract = {{We show that multiphoton coherent states can be expressed as linear
quantum superpositions of a finite number of generalized coherent
states. Quantum interferences between component states lead to
appearance of non-classical effects such as oscillations in the photon
number distribution, quadrature squeezing, SU(1, 1) squeezing and
others.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), SLOVAK ACAD SCI, INST PHYS, DUBRAVSKA CESTA 9, CS-84228 BRATISLAVA, CZECHOSLOVAKIA.}},
doi = {{10.1080/09500349314550811}},
issn = {{0950-0340}},
keywords-plus = {{JAYNES-CUMMINGS MODEL; SQUEEZED STATES; FIELD; FLUCTUATIONS; EXPANSION;
RESONANCE; EVOLUTION; ENTROPY; PHASE}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{53}},
times-cited = {{27}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{LG399}},
unique-id = {{ISI:A1993LG39900003}}
}
@article{ISI:A1993KW30900055,
author = {JEX, I and DROBNY, G},
title = {{PHASE PROPERTIES AND ENTANGLEMENT OF THE FIELD MODES IN A 2-MODE COUPLER
WITH INTENSITY-DEPENDENT COUPLING}},
journal = {{PHYSICAL REVIEW A}},
year = {{1993}},
volume = {{47}},
number = {{4, B}},
pages = {{3251-3258}},
month = {{APR}},
abstract = {{We study the phase properties of two quantized modes within the model of
a two-mode coupler with intensity-dependent coupling. The dynamics of
the system is solved numerically as an approximate analytical solution
is available only for the initial moments of the time evolution. The
phase properties are discussed on the basis of the joint phase
distribution. Other quantities of the particular modes (measure of
entropy and photon-number distribution) are presented to support the
conclusions reached on the basis of the joint phase distribution. The
obtained results are compared with the known results for the closely
related model of an ordinary linear coupler.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), UNIV TOKYO,INST SOLID STATE PHYS,7-22-1 ROPPONGI,MINATO KU,TOKYO 106,JAPAN.
SLOVAK ACAD SCI,INST PHYS,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
doi = {{10.1103/PhysRevA.47.3251}},
issn = {{1050-2947}},
keywords-plus = {{COHERENT STATES; QUANTUM-OPTICS; PERIODIC DECAY; FLUCTUATIONS;
CONVERSION; ENTROPY; OPERATOR; SYSTEMS; REVIVAL; SU(2)}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{30}},
times-cited = {{8}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{KW309}},
unique-id = {{ISI:A1993KW30900055}}
}
@inproceedings{ISI:A1993BZ07F00034,
author = {BUZEK, V and DROBNY, G and JEX, I},
editor = {{Akos, G and Lippenyi, T and Lupkovics, G and Podmaniczky, A}},
title = {{SIGNAL-PUMP ENTANGLEMENT IN QUANTUM-OPTICAL PROCESSES}},
booktitle = {{16TH CONGRESS OF THE INTERNATIONAL COMMISSION FOR OPTICS : OPTICS AS A
KEY TO HIGH TECHNOLOGY, PTS 1 AND 2}},
series = {{PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
(SPIE)}},
year = {{1993}},
volume = {{1983}},
pages = {{90-91}},
note = {{16TH CONGRESS OF THE INTERNATIONAL-COMMISSION-FOR-OPTICS : OPTICS AS A
KEY TO HIGH TECHNOLOGY ( ICO-16 ), BUDAPEST, HUNGARY, AUG 09-13, 1993}},
organization = {{INT COMMISS OPT; SCI SOC OPT ACOUST \& FILMTECH; SOC PHOTO OPT
INSTRUMENTAT ENGINEERS; OPT SOC AMER; EUROPEAN OPT SOC; HUNGARIAN NATL
COMM TECHNOL DEV; INT UNION PURE \& APPL PHYS; HUNGARIAN OPT WORKS;
LASRAM LASER TECHNOL}},
publisher = {{SPIE - INT SOC OPTICAL ENGINEERING}},
address = {{BELLINGHAM}},
type = {{Proceedings Paper}},
language = {{English}},
isbn = {{0-8194-1230-9}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{0}},
times-cited = {{0}},
doc-delivery-number = {{BZ07F}},
unique-id = {{ISI:A1993BZ07F00034}}
}
@article{ISI:A1992KB79400021,
author = {JEX, I and DROBNY, G and MATSUOKA, M},
title = {{QUANTUM PHASE PROPERTIES OF THE PROCESS OF KAPPA-PHOTON DOWN CONVERSION
WITH QUANTIZED PUMP}},
journal = {{OPTICS COMMUNICATIONS}},
year = {{1992}},
volume = {{94}},
number = {{6}},
pages = {{619-627}},
month = {{DEC 15}},
abstract = {{We study the phase properties of the field modes in the process of
k-photon down conversion with quantized pump using the Peggy-Barnett
phase formalism. The dynamics of the system is solved numerically via
the diagonalization of the interaction hamiltonian. The behavior in the
short and long time limit is discussed and compared to previous results
related to the treated problem. In order to understand our results an
exactly soluble model of the linearized k-photon down conversion is
presented.}},
publisher = {{ELSEVIER SCIENCE BV}},
address = {{PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), UNIV TOKYO,INST SOLID STATE PHYS,7-22-1 ROPPONGI,MINATO KU,TOKYO 106,JAPAN.
SLOVAK ACAD SCI,INST PHYS,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
doi = {{10.1016/0030-4018(92)90611-T}},
issn = {{0030-4018}},
keywords-plus = {{PARAMETRIC DOWN-CONVERSION; SQUEEZED COHERENT STATES; LIGHT;
FLUCTUATIONS; OPERATOR}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{34}},
times-cited = {{4}},
journal-iso = {{Opt. Commun.}},
doc-delivery-number = {{KB794}},
unique-id = {{ISI:A1992KB79400021}}
}
@article{ISI:A1992KB65800008,
author = {DROBNY, G and JEX, I and MATSUOKA, M},
title = {{COLLAPSE REVIVAL PHENOMENON IN THE PROCESS OF K-PHOTON DOWN CONVERSION
WITH SUPERPOSITIONS OF NUMBER STATES}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1992}},
volume = {{39}},
number = {{11}},
pages = {{2229-2243}},
month = {{NOV}},
abstract = {{We calculate numerically the time evolution of the mean photon number in
the process of k-photon down conversion process with quantized pump. The
pump mode was supposed to be initially in a superposition of number
states and the down converted mode in a number state. We analysed in
some detail the influence of the initial field statistics of the pump
mode as well as the presence of non-vacuum number states in the down
converted mode on the appearance of collapses and revivals.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SAS,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.
UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN.}},
doi = {{10.1080/09500349214552261}},
issn = {{0950-0340}},
keywords-plus = {{SQUEEZED COHERENT STATES; JAYNES-CUMMINGS MODEL; MINIMUM-UNCERTAINTY
PACKETS; HARMONIC-GENERATION; EQUIVALENCE CLASSES; QUANTUM-OPTICS;
2-LEVEL ATOM; LIGHT; FIELD; CAVITY}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{45}},
times-cited = {{2}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{KB658}},
unique-id = {{ISI:A1992KB65800008}}
}
@article{ISI:A1992JQ00100010,
author = {DROBNY, G and JEX, I},
title = {{PHASE PROPERTIES OF FIELD MODES IN THE PROCESS OF KTH
HARMONIC-GENERATION}},
journal = {{PHYSICS LETTERS A}},
year = {{1992}},
volume = {{169}},
number = {{4}},
pages = {{273-280}},
month = {{SEP 28}},
abstract = {{We study the phase properties of the two field modes within the frame of
the process of kth harmonic generation with a quantized fundamental
mode. Using the Pegg-Barnett phase formalism the joint phase
distribution is calculated numerically. It is shown that in the initial
moments of the evolution the degree of the process k does not affect
significantly the phase distribution.}},
publisher = {{ELSEVIER SCIENCE BV}},
address = {{PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}},
type = {{Article}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.
UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN.}},
doi = {{10.1016/0375-9601(92)90458-X}},
issn = {{0375-9601}},
keywords-plus = {{FLUCTUATIONS; CONVERSION; OPERATOR; STATES; LIGHT}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
number-of-cited-references = {{21}},
times-cited = {{3}},
journal-iso = {{Phys. Lett. A}},
doc-delivery-number = {{JQ001}},
unique-id = {{ISI:A1992JQ00100010}}
}
@article{ISI:A1992JC55800066,
author = {DROBNY, G and JEX, I},
title = {{QUANTUM-PROPERTIES OF FIELD MODES IN TRILINEAR OPTICAL PROCESSES}},
journal = {{PHYSICAL REVIEW A}},
year = {{1992}},
volume = {{46}},
number = {{1}},
pages = {{499-506}},
month = {{JUL 1}},
abstract = {{We consider a trilinear Hamiltonian in boson operators describing
various physical processes such as frequency conversion, Raman or
Brillouin scattering, or the interaction of N two-level atoms with a
single-mode radiation field. Due to the fact that two independent
integrals of motion can be found, the solution of the dynamics of the
system is reduced to the diagonalization of a finite matrix (as was
already shown by Walls and Barakat {[}Phys. Rev. A 1, 446 (1970)]).
Performing a numerical diagonalization, we analyze the statistical
properties of the field modes (sub-Poissonian statistics,
anticorrelation, squeezing). We also pay attention to the appearance of
collapses and revivals in the mean photon number of the modes. The
relation of this model to the model of two coupled modes with an
intensity-dependent coupling constant is pointed out.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.
UNIV TOKYO,INST SOLID STATE PHYS,TOKYO 106,JAPAN.}},
doi = {{10.1103/PhysRevA.46.499}},
issn = {{1050-2947}},
keywords-plus = {{JAYNES-CUMMINGS MODEL; RADIATION-FIELD; COHERENT STATES; PERIODIC DECAY;
STATISTICS; REVIVAL; DYNAMICS; SU(2)}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{37}},
times-cited = {{36}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{JC558}},
unique-id = {{ISI:A1992JC55800066}}
}
@article{ISI:A1992HY06200013,
author = {JEX, I and DROBNY, G},
title = {{SU(1,1) AND SU(2) SQUEEZING IN TRILINEAR OPTICAL PROCESSES}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1992}},
volume = {{39}},
number = {{5}},
pages = {{1043-1053}},
month = {{MAY}},
abstract = {{The squeezing properties in terms of SU(1, 1) and SU(2) operators for
the case of trilinear processes are studied. The initial state of the
system is supposed to be a coherent state in one of the modes and number
states in the remaining modes. It is pointed out that in several cases a
considerable amount of squeezing can be achieved. Due to the common
mathematical structure the case of a two-mode coupler with intensity
dependent coupling is also analysed.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN.
SLOVAK ACAD SCI,INST PHYS,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
doi = {{10.1080/09500349214551061}},
issn = {{0950-0340}},
keywords-plus = {{COHERENT STATES; ELECTROMAGNETIC-FIELD; RADIATION-FIELD; QUANTUM-OPTICS;
PERIODIC DECAY; DYNAMICS; ATOM; STATISTICS; AMPLITUDE; REVIVAL}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{39}},
times-cited = {{5}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{HY062}},
unique-id = {{ISI:A1992HY06200013}}
}
@article{ISI:A1992HT68400017,
author = {JEX, I},
title = {{EMISSION-SPECTRA OF A 2-LEVEL ATOM UNDER THE PRESENCE OF ANOTHER 2-LEVEL
ATOM}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1992}},
volume = {{39}},
number = {{4}},
pages = {{835-844}},
month = {{APR}},
abstract = {{We investigate the spectrum of light emitted by a two-level atom
interacting with another two-level atom inside an ideal cavity within
the frame of generalized Jaynes-Cummings model. The influence of various
ratios of the coupling constants of the atoms to the field on the
spectrum of the emitted light is studied in detail for the case when the
atoms are supposed to be initially in the excited state and the field in
a Fock state as well as their superposition.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{JEX, I (Reprint Author), UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN.}},
doi = {{10.1080/09500349214550831}},
issn = {{0950-0340}},
keywords-plus = {{JAYNES-CUMMINGS MODEL; RABI OSCILLATIONS; SQUEEZED VACUUM; N ATOMS;
CAVITY; STATES; LIGHT}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{35}},
times-cited = {{0}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{HT684}},
unique-id = {{ISI:A1992HT68400017}}
}
@article{ISI:A1992HN47600011,
author = {DROBNY, G and JEX, I},
title = {{STATISTICS OF FIELD MODES IN THE PROCESS OF KAPPA-PHOTON DOWN-CONVERSION
WITH A QUANTIZED PUMP}},
journal = {{PHYSICAL REVIEW A}},
year = {{1992}},
volume = {{45}},
number = {{7, B}},
pages = {{4897-4903}},
month = {{APR 1}},
abstract = {{We solve numerically the dynamics of a system related to the problem of
k-photon down-conversion with a quantized pump. We analyze in detail
the statistical properties of the field modes. We show that the fields
exhibit sub-Poissonian statistics and anticorrelation. The influence of
different initial Fock states as well as their coherent superpositions
on the field statistics and squeezing of the modes is analyzed in
detail.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.
UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN.}},
doi = {{10.1103/PhysRevA.45.4897}},
issn = {{1050-2947}},
keywords-plus = {{SQUEEZED COHERENT STATES; LIGHT; SU(2)}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{19}},
times-cited = {{16}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{HN476}},
unique-id = {{ISI:A1992HN47600011}}
}
@article{ISI:A1992HC99500065,
author = {DROBNY, G and JEX, I},
title = {{COLLAPSES AND REVIVALS IN THE ENERGY EXCHANGE IN THE PROCESS OF
KAPPA-PHOTON DOWN-CONVERSION WITH QUANTIZED PUMP}},
journal = {{PHYSICAL REVIEW A}},
year = {{1992}},
volume = {{45}},
number = {{3}},
pages = {{1816-1821}},
month = {{FEB 1}},
abstract = {{We analyze the collapse and revival phenomenon in the energy exchange of
two field modes initially prepared in a Fock state, as well as their
coherent superposition in the process of k-photon down-conversion with
quantized pump. The influence of the presence of a Kerr-like medium is
discussed.}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Article}},
language = {{English}},
affiliation = {{DROBNY, G (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.
UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN.}},
doi = {{10.1103/PhysRevA.45.1816}},
issn = {{1050-2947}},
keywords-plus = {{COHERENT STATES; QUANTUM-OPTICS; ATOM; RADIATION; CAVITY; FIELD; MODEL}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{25}},
times-cited = {{23}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{HC995}},
unique-id = {{ISI:A1992HC99500065}}
}
@article{ISI:A1992HG44500002,
author = {BERNAT, V and JEX, I},
title = {{QUANTUM COLLAPSE AND REVIVAL OF A 2-LEVEL ATOM WITH INTENSITY-DEPENDENT
DETUNING IN A FINITE Q-CAVITY AT FINITE TEMPERATURE}},
journal = {{QUANTUM OPTICS}},
year = {{1992}},
volume = {{4}},
number = {{1}},
pages = {{9-17}},
month = {{FEB}},
abstract = {{We consider a generalization of the Jaynes-Cummings model when the
cavity is supposed to be filled with a Kerr-like medium. This
non-linearity induced by the Kerr-like medium leads to an inhibited
decay of the initially excited atom. In the present paper we analyse the
influence of the quality of the cavity and the influence of a
thermofield on the collapses and revivals of the atomic inversion.}},
publisher = {{IOP PUBLISHING LTD}},
address = {{TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX}},
type = {{Article}},
language = {{English}},
affiliation = {{BERNAT, V (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84238 BRATISLAVA,CZECHOSLOVAKIA.}},
doi = {{10.1088/0954-8998/4/1/002}},
issn = {{0954-8998}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Applied}},
number-of-cited-references = {{0}},
times-cited = {{5}},
doc-delivery-number = {{HG445}},
unique-id = {{ISI:A1992HG44500002}}
}
@article{ISI:A1991FM47500017,
author = {BUZEK, V and JEX, I},
title = {{EMISSION-SPECTRA OF A 2-LEVEL ATOM IN A KERR-LIKE MEDIUM}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1991}},
volume = {{38}},
number = {{5}},
pages = {{987-996}},
month = {{MAY}},
abstract = {{We have investigated the spectrum of light emitted by a single atom
interacting with a single mode of the radiation field in an ideal cavity
filled with a Kerr-like medium. It is shown that owing to the Kerr-like
nonlinearity in the system the spectrum of the emitted light exhibits a
single-peaked structure for sufficiently high intensities of the initial
coherent field instead of the triplet structure in the case of the
standard Jaynes-Cummings model.}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{BUZEK, V (Reprint Author), UNIV LONDON IMPERIAL COLL SCI \& TECHNOL,BLACKETT LAB,OPT SECT,LONDON SW7 2BZ,ENGLAND.
SLOVAK ACAD SCI,INST PHYS,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
doi = {{10.1080/09500349114550961}},
issn = {{0950-0340}},
keywords-plus = {{JAYNES-CUMMINGS MODEL; INHIBITED SPONTANEOUS EMISSION; SIMPLE QUANTUM
MODEL; RABI OSCILLATIONS; SQUEEZED VACUUM; CAVITY; REVIVAL; COLLAPSE;
ABSORPTION; RESONANCE}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{44}},
times-cited = {{16}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{FM475}},
unique-id = {{ISI:A1991FM47500017}}
}
@article{ISI:A1991FH65200003,
author = {BUZEK, V and JEX, I and BRISUDOVA, M},
title = {{JAYNES-CUMMINGS MODEL WITH DISPLACED NUMBER STATES}},
journal = {{INTERNATIONAL JOURNAL OF MODERN PHYSICS B}},
year = {{1991}},
volume = {{5}},
number = {{5}},
pages = {{797-814}},
month = {{MAR}},
abstract = {{We investigate the dynamics of the Jaynes-Cummings model with the cavity
field initially prepared in the displaced number state. The time
evolution of the atomic population inversion, squeezing of the cavity
field and the emission spectra from the two-level atom are studied.}},
publisher = {{WORLD SCIENTIFIC PUBL CO PTE LTD}},
address = {{JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE}},
type = {{Article}},
language = {{English}},
affiliation = {{BUZEK, V (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
doi = {{10.1142/S0217979291000420}},
issn = {{0217-9792}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Applied; Physics, Condensed Matter; Physics, Mathematical}},
number-of-cited-references = {{0}},
times-cited = {{11}},
journal-iso = {{Int. J. Mod. Phys. B}},
doc-delivery-number = {{FH652}},
unique-id = {{ISI:A1991FH65200003}}
}
@article{ISI:A1991FB49200003,
author = {BUZEK, V and JEX, I},
title = {{MULTIPHOTON STATES AND AMPLITUDE K-TH POWER SQUEEZING}},
journal = {{NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA B-GENERAL PHYSICS
RELATIVITY ASTRONOMY AND MATHEMATICAL PHYSICS AND METHODS}},
year = {{1991}},
volume = {{106}},
number = {{2}},
pages = {{147-157}},
month = {{FEB}},
abstract = {{On the basis of the work of d'Ariano and coworkers we introduce a new
type of multiphoton states. We analyse amplitude k-th power squeezing
of the multiphoton states. In particular, we show that even if the
multiphoton states do not exhibit ordinary squeezing they can be
amplitude k-th power squeezed.}},
publisher = {{EDITRICE COMPOSITORI BOLOGNA}},
address = {{VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY}},
type = {{Article}},
language = {{English}},
affiliation = {{BUZEK, V (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
issn = {{0369-3554}},
keywords = {{QUANTUM THEORY; QUANTUM MECHANICS; NONCLASSICAL PHOTON STATES (INCLUDING
ANTIBUNCHED; SQUEEZED; SUB-POISSONIAN)}},
keywords-plus = {{COHERENT STATES; FIELD; FLUCTUATIONS}},
research-areas = {{Physics}},
web-of-science-categories = {{Physics, Multidisciplinary}},
number-of-cited-references = {{29}},
times-cited = {{3}},
journal-iso = {{Nouvo Cimento Soc. Ital. Fis. B-Gen. Phys. Relativ. Astron. Math. Phys.
Methods}},
doc-delivery-number = {{FB492}},
unique-id = {{ISI:A1991FB49200003}}
}
@article{ISI:A1990EC68100023,
author = {BUZEK, V and JEX, I},
title = {{DYNAMICS OF A 2-LEVEL ATOM IN A KERR-LIKE MEDIUM}},
journal = {{OPTICS COMMUNICATIONS}},
year = {{1990}},
volume = {{78}},
number = {{5-6}},
pages = {{425-435}},
month = {{SEP 15}},
publisher = {{ELSEVIER SCIENCE BV}},
address = {{PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}},
type = {{Article}},
language = {{English}},
affiliation = {{BUZEK, V (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
doi = {{10.1016/0030-4018(90)90340-Y}},
issn = {{0030-4018}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{61}},
times-cited = {{106}},
journal-iso = {{Opt. Commun.}},
doc-delivery-number = {{EC681}},
unique-id = {{ISI:A1990EC68100023}}
}
@article{ISI:A1990CY12500080,
author = {BUZEK, V and JEX, I},
title = {{AMPLITUDE KAPPA-TH-POWER SQUEEZING OF KAPPA-PHOTON COHERENT STATES}},
journal = {{PHYSICAL REVIEW A}},
year = {{1990}},
volume = {{41}},
number = {{7}},
pages = {{4079-4082}},
month = {{APR 1}},
publisher = {{AMERICAN PHYSICAL SOC}},
address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
type = {{Note}},
language = {{English}},
affiliation = {{BUZEK, V (Reprint Author), SLOVAK ACAD SCI,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
issn = {{1050-2947}},
research-areas = {{Optics; Physics}},
web-of-science-categories = {{Optics; Physics, Atomic, Molecular \& Chemical}},
number-of-cited-references = {{23}},
times-cited = {{17}},
journal-iso = {{Phys. Rev. A}},
doc-delivery-number = {{CY125}},
unique-id = {{ISI:A1990CY12500080}}
}
@article{ISI:A1990CH91300003,
author = {BUZEK, V and JEX, I and QUANG, T},
title = {{K-PHOTON COHERENT STATES}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1990}},
volume = {{37}},
number = {{2}},
pages = {{159-163}},
month = {{FEB}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Letter}},
language = {{English}},
affiliation = {{BUZEK, V (Reprint Author), EPRC SAS,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.
JOINT INST NUCL RES,MOSCOW 101000,USSR.}},
doi = {{10.1080/09500349014550231}},
issn = {{0950-0340}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{21}},
times-cited = {{52}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{CH913}},
unique-id = {{ISI:A1990CH91300003}}
}
@article{ISI:A1989AT46600003,
author = {BUZEK, V and JEX, I},
title = {{COLLAPSE REVIVAL PHENOMENON IN THE JAYNES-CUMMINGS MODEL INTERACTING
WITH THE MULTIPHOTON HOLSTEIN-PRIMAKOFF SU(2) COHERENT STATE}},
journal = {{JOURNAL OF MODERN OPTICS}},
year = {{1989}},
volume = {{36}},
number = {{11}},
pages = {{1427-1434}},
month = {{NOV}},
publisher = {{TAYLOR \& FRANCIS LTD}},
address = {{ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE}},
type = {{Article}},
language = {{English}},
affiliation = {{BUZEK, V (Reprint Author), SLOVAK ACAD SCI,EPRC,INST PHYS,DUBRAVSKA CESTA 9,CS-84228 BRATISLAVA,CZECHOSLOVAKIA.}},
issn = {{0950-0340}},
research-areas = {{Optics}},
web-of-science-categories = {{Optics}},
number-of-cited-references = {{29}},
times-cited = {{13}},
journal-iso = {{J. Mod. Opt.}},
doc-delivery-number = {{AT466}},
unique-id = {{ISI:A1989AT46600003}}
}
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