---
_id: '66640'
abstract:
- lang: eng
  text: "<jats:p>\r\n                    We develop a framework for identifying nonclassical
    speedups in systems with polarization, likewise spin degrees of freedom. By confining
    the dynamics to the manifold of angular momentum coherent states, which act as
    the classical reference in this case, we compute the speed limit that bounds the
    rate of change of the state achievable without generating quantum coherence. A
    comparison with the unrestricted quantum speed limit enables the quantitative
    identification of speedups arising from polarization nonclassicality. We apply
    this framework to the cross-Kerr interaction, demonstrating a persistent speedup
    scaling as\r\n                    <a:math xmlns:a=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \                     <a:mrow>\r\n                        <a:mi mathvariant=\"script\">O</a:mi>\r\n
    \                       <a:mo>(</a:mo>\r\n                        <a:msqrt>\r\n
    \                         <a:mi>N</a:mi>\r\n                        </a:msqrt>\r\n
    \                       <a:mo>)</a:mo>\r\n                      </a:mrow>\r\n
    \                   </a:math>\r\n                    with the photon number\r\n
    \                   <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \                     <c:mi>N</c:mi>\r\n                    </c:math>\r\n                    ,
    with a parity effect in favor of even photon numbers. The results establish polarization
    nonclassicality as a genuine dynamical resource, linking quantum coherence to
    quantum-enhanced evolution speeds in nonlinear photonic systems.\r\n                  </jats:p>"
article_number: L032018
author:
- first_name: Tim
  full_name: Aßbrock, Tim
  last_name: Aßbrock
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Laura
  full_name: Ares, Laura
  last_name: Ares
citation:
  ama: Aßbrock T, Sperling J, Ares L. Quantum speedup from nonclassical polarization.
    <i>Physical Review Research</i>. 2026;8(3). doi:<a href="https://doi.org/10.1103/mflc-2mzq">10.1103/mflc-2mzq</a>
  apa: Aßbrock, T., Sperling, J., &#38; Ares, L. (2026). Quantum speedup from nonclassical
    polarization. <i>Physical Review Research</i>, <i>8</i>(3), Article L032018. <a
    href="https://doi.org/10.1103/mflc-2mzq">https://doi.org/10.1103/mflc-2mzq</a>
  bibtex: '@article{Aßbrock_Sperling_Ares_2026, title={Quantum speedup from nonclassical
    polarization}, volume={8}, DOI={<a href="https://doi.org/10.1103/mflc-2mzq">10.1103/mflc-2mzq</a>},
    number={3L032018}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Aßbrock, Tim and Sperling, Jan and Ares, Laura}, year={2026}
    }'
  chicago: Aßbrock, Tim, Jan Sperling, and Laura Ares. “Quantum Speedup from Nonclassical
    Polarization.” <i>Physical Review Research</i> 8, no. 3 (2026). <a href="https://doi.org/10.1103/mflc-2mzq">https://doi.org/10.1103/mflc-2mzq</a>.
  ieee: 'T. Aßbrock, J. Sperling, and L. Ares, “Quantum speedup from nonclassical
    polarization,” <i>Physical Review Research</i>, vol. 8, no. 3, Art. no. L032018,
    2026, doi: <a href="https://doi.org/10.1103/mflc-2mzq">10.1103/mflc-2mzq</a>.'
  mla: Aßbrock, Tim, et al. “Quantum Speedup from Nonclassical Polarization.” <i>Physical
    Review Research</i>, vol. 8, no. 3, L032018, American Physical Society (APS),
    2026, doi:<a href="https://doi.org/10.1103/mflc-2mzq">10.1103/mflc-2mzq</a>.
  short: T. Aßbrock, J. Sperling, L. Ares, Physical Review Research 8 (2026).
date_created: 2026-08-03T16:26:49Z
date_updated: 2026-08-03T16:28:48Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
doi: 10.1103/mflc-2mzq
intvolume: '         8'
issue: '3'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Quantum speedup from nonclassical polarization
type: journal_article
user_id: '75127'
volume: 8
year: '2026'
...
---
_id: '66075'
abstract:
- lang: eng
  text: <jats:p>Indefinite causal order (ICO) has the potential to be a new resource
    for quantum information processing. In most of its experiments, ICO has been investigated
    in a photonic platform. Here, we investigate ICO in a cavity quantum electrodynamics
    system composed of two cavities. Our results show that ICO can create highly entangled
    states of two distant cavity fields that never interact directly independent of
    the initial (excited or ground) state of the atom. These entangled states can
    have the form of one- or two-photon NOON states. We show that ICO can interchange
    one photon between both cavities without changing the state of the atom, something
    that is impossible to achieve for two cavities in well-defined order. Furthermore,
    the vacuum Rabi oscillations either disappear or lose their sinusoidal form with
    ICO. Our results show the potential that ICO can offer in the paradigm of light-matter
    interaction for coherently controlling atom-field observables.</jats:p>
article_number: '023295'
article_type: original
author:
- first_name: Luis Octavio
  full_name: Castaños-Cervantes, Luis Octavio
  last_name: Castaños-Cervantes
- first_name: Lorenzo Manuel
  full_name: Procopio Peña, Lorenzo Manuel
  id: '105816'
  last_name: Procopio Peña
- first_name: Tim J.
  full_name: Bartley, Tim J.
  last_name: Bartley
citation:
  ama: Castaños-Cervantes LO, Procopio Peña LM, Bartley TJ. Indefinite causal order
    in cavity quantum electrodynamics. <i>Physical Review Research</i>. 2026;8(2).
    doi:<a href="https://doi.org/10.1103/wgr6-1g5m">10.1103/wgr6-1g5m</a>
  apa: Castaños-Cervantes, L. O., Procopio Peña, L. M., &#38; Bartley, T. J. (2026).
    Indefinite causal order in cavity quantum electrodynamics. <i>Physical Review
    Research</i>, <i>8</i>(2), Article 023295. <a href="https://doi.org/10.1103/wgr6-1g5m">https://doi.org/10.1103/wgr6-1g5m</a>
  bibtex: '@article{Castaños-Cervantes_Procopio Peña_Bartley_2026, title={Indefinite
    causal order in cavity quantum electrodynamics}, volume={8}, DOI={<a href="https://doi.org/10.1103/wgr6-1g5m">10.1103/wgr6-1g5m</a>},
    number={2023295}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Castaños-Cervantes, Luis Octavio and Procopio Peña, Lorenzo
    Manuel and Bartley, Tim J.}, year={2026} }'
  chicago: Castaños-Cervantes, Luis Octavio, Lorenzo Manuel Procopio Peña, and Tim
    J. Bartley. “Indefinite Causal Order in Cavity Quantum Electrodynamics.” <i>Physical
    Review Research</i> 8, no. 2 (2026). <a href="https://doi.org/10.1103/wgr6-1g5m">https://doi.org/10.1103/wgr6-1g5m</a>.
  ieee: 'L. O. Castaños-Cervantes, L. M. Procopio Peña, and T. J. Bartley, “Indefinite
    causal order in cavity quantum electrodynamics,” <i>Physical Review Research</i>,
    vol. 8, no. 2, Art. no. 023295, 2026, doi: <a href="https://doi.org/10.1103/wgr6-1g5m">10.1103/wgr6-1g5m</a>.'
  mla: Castaños-Cervantes, Luis Octavio, et al. “Indefinite Causal Order in Cavity
    Quantum Electrodynamics.” <i>Physical Review Research</i>, vol. 8, no. 2, 023295,
    American Physical Society (APS), 2026, doi:<a href="https://doi.org/10.1103/wgr6-1g5m">10.1103/wgr6-1g5m</a>.
  short: L.O. Castaños-Cervantes, L.M. Procopio Peña, T.J. Bartley, Physical Review
    Research 8 (2026).
date_created: 2026-06-29T08:08:42Z
date_updated: 2026-07-07T07:29:09Z
doi: 10.1103/wgr6-1g5m
intvolume: '         8'
issue: '2'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Indefinite causal order in cavity quantum electrodynamics
type: journal_article
user_id: '105816'
volume: 8
year: '2026'
...
---
_id: '66665'
abstract:
- lang: eng
  text: Multimode quantum light has promising applications in many areas of physics,
    such as quantum communications and quantum computing. However, its multimode nature
    also makes it challenging to measure its properties. Recently [I. Barakat et al.,
    Optica Quantum 3, 36 (2025)], a technique for the simultaneous measurement of
    squeezing of multiple broadband modes based on a phase-sensitive amplification
    approach was experimentally implemented using a setup that effectively corresponds
    to an SU(1,1) interferometer. Here, we aim to provide a complete theoretical analysis
    of the modal structure of (generally unbalanced) SU(1,1) interferometers and a
    detailed theoretical formal derivation of the framework for this technique. Utilizing
    the joint Schmidt decomposition of the transfer functions, we investigate the
    shape and phase profiles of the modes of the SU(1,1) interferometer and its components
    [parametric down-conversion (PDC) sections] for different parametric gain regimes.
    We discover a complicated interplay between the PDC modes and the modes of the
    entire interferometer, and analyze it by using their overlap coefficients as a
    similarity measure. Finally, we develop a rigorous processing method for the aforementioned
    multimode squeezing measurement technique and discuss necessary approximations
    to make this method experimentally feasible.
article_number: '033139'
article_type: original
author:
- first_name: Dennis
  full_name: Scharwald, Dennis
  id: '55907'
  last_name: Scharwald
  orcid: 0009-0007-5654-5412
- first_name: Polina
  full_name: Sharapova, Polina
  id: '60286'
  last_name: Sharapova
citation:
  ama: Scharwald D, Sharapova P. Characterization of spatial Schmidt modes in high-gain
    SU(1,1) interferometers. <i>Physical Review Research</i>. 2026;8(3). doi:<a href="https://doi.org/10.1103/ph64-ts39">10.1103/ph64-ts39</a>
  apa: Scharwald, D., &#38; Sharapova, P. (2026). Characterization of spatial Schmidt
    modes in high-gain SU(1,1) interferometers. <i>Physical Review Research</i>, <i>8</i>(3),
    Article 033139. <a href="https://doi.org/10.1103/ph64-ts39">https://doi.org/10.1103/ph64-ts39</a>
  bibtex: '@article{Scharwald_Sharapova_2026, title={Characterization of spatial Schmidt
    modes in high-gain SU(1,1) interferometers}, volume={8}, DOI={<a href="https://doi.org/10.1103/ph64-ts39">10.1103/ph64-ts39</a>},
    number={3033139}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Scharwald, Dennis and Sharapova, Polina}, year={2026}
    }'
  chicago: Scharwald, Dennis, and Polina Sharapova. “Characterization of Spatial Schmidt
    Modes in High-Gain SU(1,1) Interferometers.” <i>Physical Review Research</i> 8,
    no. 3 (2026). <a href="https://doi.org/10.1103/ph64-ts39">https://doi.org/10.1103/ph64-ts39</a>.
  ieee: 'D. Scharwald and P. Sharapova, “Characterization of spatial Schmidt modes
    in high-gain SU(1,1) interferometers,” <i>Physical Review Research</i>, vol. 8,
    no. 3, Art. no. 033139, 2026, doi: <a href="https://doi.org/10.1103/ph64-ts39">10.1103/ph64-ts39</a>.'
  mla: Scharwald, Dennis, and Polina Sharapova. “Characterization of Spatial Schmidt
    Modes in High-Gain SU(1,1) Interferometers.” <i>Physical Review Research</i>,
    vol. 8, no. 3, 033139, American Physical Society (APS), 2026, doi:<a href="https://doi.org/10.1103/ph64-ts39">10.1103/ph64-ts39</a>.
  short: D. Scharwald, P. Sharapova, Physical Review Research 8 (2026).
date_created: 2026-08-05T11:51:21Z
date_updated: 2026-08-12T14:29:44Z
department:
- _id: '975'
- _id: '15'
- _id: '623'
- _id: '569'
- _id: '170'
- _id: '35'
- _id: '429'
- _id: '34'
- _id: '502'
doi: 10.1103/ph64-ts39
intvolume: '         8'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://journals.aps.org/prresearch/pdf/10.1103/ph64-ts39
oa: '1'
project:
- _id: '56'
  name: TRR 142 - Project Area C
- _id: '53'
  name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
    zu funktionellen Strukturen'
- _id: '174'
  name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen
    Systemen: Eine theoretische Analyse'
- _id: '52'
  name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Characterization of spatial Schmidt modes in high-gain SU(1,1) interferometers
type: journal_article
user_id: '55907'
volume: 8
year: '2026'
...
---
_id: '62912'
abstract:
- lang: eng
  text: <jats:p>We investigate the dynamics of wave packets in a parabolic optical
    lattice formed by combining an optical lattice with a global parabolic trap. Our
    study examines the phase space representation of the system's eigenstates by comparing
    them to the classical phase space of a pendulum, to which the system effectively
    maps. The analysis reveals that quantum states can exhibit mixed dynamics by straddling
    the separatrix. A key finding is that the dynamics around the separatrix enables
    the controlled creation of highly nonclassical states, distinguishing them from
    the classical oscillatory or rotational dynamics of the pendulum. By considering
    a finite momentum of the initial wave packet, we demonstrate various dynamical
    regimes. Furthermore, a slight energy mismatch between nearly degenerate states
    localized at opposite turning points of the trap potential results in controlled
    long-range dynamical tunneling. These results can be interpreted as quantum beating
    between a clockwise rotating and a counterclockwise rotating pendulum.</jats:p>
article_number: '013141'
author:
- first_name: Usman
  full_name: Ali, Usman
  last_name: Ali
- first_name: Martin
  full_name: Holthaus, Martin
  last_name: Holthaus
- first_name: Torsten
  full_name: Meier, Torsten
  id: '344'
  last_name: Meier
  orcid: 0000-0001-8864-2072
citation:
  ama: 'Ali U, Holthaus M, Meier T. Wave packet dynamics in parabolic optical lattices:
    From Bloch oscillations to long-range dynamical tunneling. <i>Physical Review
    Research</i>. 2025;7(1). doi:<a href="https://doi.org/10.1103/physrevresearch.7.013141">10.1103/physrevresearch.7.013141</a>'
  apa: 'Ali, U., Holthaus, M., &#38; Meier, T. (2025). Wave packet dynamics in parabolic
    optical lattices: From Bloch oscillations to long-range dynamical tunneling. <i>Physical
    Review Research</i>, <i>7</i>(1), Article 013141. <a href="https://doi.org/10.1103/physrevresearch.7.013141">https://doi.org/10.1103/physrevresearch.7.013141</a>'
  bibtex: '@article{Ali_Holthaus_Meier_2025, title={Wave packet dynamics in parabolic
    optical lattices: From Bloch oscillations to long-range dynamical tunneling},
    volume={7}, DOI={<a href="https://doi.org/10.1103/physrevresearch.7.013141">10.1103/physrevresearch.7.013141</a>},
    number={1013141}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Ali, Usman and Holthaus, Martin and Meier, Torsten}, year={2025}
    }'
  chicago: 'Ali, Usman, Martin Holthaus, and Torsten Meier. “Wave Packet Dynamics
    in Parabolic Optical Lattices: From Bloch Oscillations to Long-Range Dynamical
    Tunneling.” <i>Physical Review Research</i> 7, no. 1 (2025). <a href="https://doi.org/10.1103/physrevresearch.7.013141">https://doi.org/10.1103/physrevresearch.7.013141</a>.'
  ieee: 'U. Ali, M. Holthaus, and T. Meier, “Wave packet dynamics in parabolic optical
    lattices: From Bloch oscillations to long-range dynamical tunneling,” <i>Physical
    Review Research</i>, vol. 7, no. 1, Art. no. 013141, 2025, doi: <a href="https://doi.org/10.1103/physrevresearch.7.013141">10.1103/physrevresearch.7.013141</a>.'
  mla: 'Ali, Usman, et al. “Wave Packet Dynamics in Parabolic Optical Lattices: From
    Bloch Oscillations to Long-Range Dynamical Tunneling.” <i>Physical Review Research</i>,
    vol. 7, no. 1, 013141, American Physical Society (APS), 2025, doi:<a href="https://doi.org/10.1103/physrevresearch.7.013141">10.1103/physrevresearch.7.013141</a>.'
  short: U. Ali, M. Holthaus, T. Meier, Physical Review Research 7 (2025).
date_created: 2025-12-05T09:36:31Z
date_updated: 2025-12-05T09:37:10Z
department:
- _id: '15'
- _id: '170'
- _id: '293'
- _id: '230'
- _id: '35'
doi: 10.1103/physrevresearch.7.013141
intvolume: '         7'
issue: '1'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Wave packet dynamics in parabolic optical lattices: From Bloch oscillations
  to long-range dynamical tunneling'
type: journal_article
user_id: '16199'
volume: 7
year: '2025'
...
---
_id: '62910'
abstract:
- lang: eng
  text: <jats:p>Frequency-filtered photon correlations have been proven to be extremely
    useful in grasping how the detection process alters photon statistics. Harnessing
    the spectral correlations also permits refinement of the emission and unraveling
    of previously hidden strong correlations in a plethora of quantum-optical systems
    under continuous-wave excitation. In this work, we investigate such correlations
    for time-dependent excitation and develop a methodology to compute efficiently
    time-integrated correlations, which are at the heart of the photon-counting theory,
    and subsequently apply it to analyze the photon emission of pulsed systems. By
    combining this formalism with the —which facilitates frequency-resolved correlations—we
    demonstrate how spectral filtering enhances single-photon purity and suppresses
    multiphoton noise in time-bin-encoded quantum states. Specifically, filtering
    the central spectral peak of a dynamically driven two-level system boosts temporal
    coherence and improves the fidelity of time-bin entanglement preparation, even
    under conditions favoring multiphoton emission. These results establish spectral
    filtering as a critical tool for tailoring photon statistics in pulsed quantum
    light sources.</jats:p>
article_number: '033296'
author:
- first_name: Santiago
  full_name: Bermúdez-Feijóo, Santiago
  last_name: Bermúdez-Feijóo
- first_name: Eduardo
  full_name: Zubizarreta Casalengua, Eduardo
  last_name: Zubizarreta Casalengua
- first_name: Kai
  full_name: Müller, Kai
  last_name: Müller
- first_name: Klaus D.
  full_name: Jöns, Klaus D.
  last_name: Jöns
citation:
  ama: Bermúdez-Feijóo S, Zubizarreta Casalengua E, Müller K, Jöns KD. Spectral correlations
    of dynamical resonance fluorescence. <i>Physical Review Research</i>. 2025;7(3).
    doi:<a href="https://doi.org/10.1103/jmy9-bd3l">10.1103/jmy9-bd3l</a>
  apa: Bermúdez-Feijóo, S., Zubizarreta Casalengua, E., Müller, K., &#38; Jöns, K.
    D. (2025). Spectral correlations of dynamical resonance fluorescence. <i>Physical
    Review Research</i>, <i>7</i>(3), Article 033296. <a href="https://doi.org/10.1103/jmy9-bd3l">https://doi.org/10.1103/jmy9-bd3l</a>
  bibtex: '@article{Bermúdez-Feijóo_Zubizarreta Casalengua_Müller_Jöns_2025, title={Spectral
    correlations of dynamical resonance fluorescence}, volume={7}, DOI={<a href="https://doi.org/10.1103/jmy9-bd3l">10.1103/jmy9-bd3l</a>},
    number={3033296}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Bermúdez-Feijóo, Santiago and Zubizarreta Casalengua,
    Eduardo and Müller, Kai and Jöns, Klaus D.}, year={2025} }'
  chicago: Bermúdez-Feijóo, Santiago, Eduardo Zubizarreta Casalengua, Kai Müller,
    and Klaus D. Jöns. “Spectral Correlations of Dynamical Resonance Fluorescence.”
    <i>Physical Review Research</i> 7, no. 3 (2025). <a href="https://doi.org/10.1103/jmy9-bd3l">https://doi.org/10.1103/jmy9-bd3l</a>.
  ieee: 'S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, and K. D. Jöns,
    “Spectral correlations of dynamical resonance fluorescence,” <i>Physical Review
    Research</i>, vol. 7, no. 3, Art. no. 033296, 2025, doi: <a href="https://doi.org/10.1103/jmy9-bd3l">10.1103/jmy9-bd3l</a>.'
  mla: Bermúdez-Feijóo, Santiago, et al. “Spectral Correlations of Dynamical Resonance
    Fluorescence.” <i>Physical Review Research</i>, vol. 7, no. 3, 033296, American
    Physical Society (APS), 2025, doi:<a href="https://doi.org/10.1103/jmy9-bd3l">10.1103/jmy9-bd3l</a>.
  short: S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, K.D. Jöns, Physical
    Review Research 7 (2025).
date_created: 2025-12-05T08:47:30Z
date_updated: 2025-12-05T08:48:02Z
doi: 10.1103/jmy9-bd3l
intvolume: '         7'
issue: '3'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Spectral correlations of dynamical resonance fluorescence
type: journal_article
user_id: '104310'
volume: 7
year: '2025'
...
---
_id: '62911'
abstract:
- lang: eng
  text: <jats:p>In this paper, we theoretically study the spectral and temporal properties
    of pulsed spontaneous parametric down-conversion (SPDC) generated in lossy waveguides.
    Our theoretical approach is based on the formalism of Gaussian states and the
    Langevin equation, which is elaborated for weak parametric down-conversion and
    photon-number-unresolved click detection. Using the example of frequency-degenerate
    type-II SPDC generated under the pump-idler group-velocity-matching condition,
    we show how the joint-spectral intensity, mode structure, normalized second-order
    correlation function, and Hong-Ou-Mandel interference pattern depend on internal
    losses of the SPDC process. We found that the joint-spectral intensity is almost
    insensitive to internal losses, while the second-order correlation function shows
    a strong dependence on them, being different for the signal and idler beams in
    the presence of internal losses. Based on the sensitivity of the normalized second-order
    correlation function, we show how its measurement can be used to experimentally
    determine internal losses.</jats:p>
article_number: '033122'
author:
- first_name: Denis A.
  full_name: Kopylov, Denis A.
  last_name: Kopylov
- first_name: Michael
  full_name: Stefszky, Michael
  id: '42777'
  last_name: Stefszky
- first_name: Torsten
  full_name: Meier, Torsten
  id: '344'
  last_name: Meier
  orcid: 0000-0001-8864-2072
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
- first_name: Polina R.
  full_name: Sharapova, Polina R.
  id: '60286'
  last_name: Sharapova
citation:
  ama: 'Kopylov DA, Stefszky M, Meier T, Silberhorn C, Sharapova PR. Spectral and
    temporal properties of type-II parametric down-conversion: The impact of losses
    during state generation. <i>Physical Review Research</i>. 2025;7(3). doi:<a href="https://doi.org/10.1103/zp72-7qwl">10.1103/zp72-7qwl</a>'
  apa: 'Kopylov, D. A., Stefszky, M., Meier, T., Silberhorn, C., &#38; Sharapova,
    P. R. (2025). Spectral and temporal properties of type-II parametric down-conversion:
    The impact of losses during state generation. <i>Physical Review Research</i>,
    <i>7</i>(3), Article 033122. <a href="https://doi.org/10.1103/zp72-7qwl">https://doi.org/10.1103/zp72-7qwl</a>'
  bibtex: '@article{Kopylov_Stefszky_Meier_Silberhorn_Sharapova_2025, title={Spectral
    and temporal properties of type-II parametric down-conversion: The impact of losses
    during state generation}, volume={7}, DOI={<a href="https://doi.org/10.1103/zp72-7qwl">10.1103/zp72-7qwl</a>},
    number={3033122}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Kopylov, Denis A. and Stefszky, Michael and Meier, Torsten
    and Silberhorn, Christine and Sharapova, Polina R.}, year={2025} }'
  chicago: 'Kopylov, Denis A., Michael Stefszky, Torsten Meier, Christine Silberhorn,
    and Polina R. Sharapova. “Spectral and Temporal Properties of Type-II Parametric
    down-Conversion: The Impact of Losses during State Generation.” <i>Physical Review
    Research</i> 7, no. 3 (2025). <a href="https://doi.org/10.1103/zp72-7qwl">https://doi.org/10.1103/zp72-7qwl</a>.'
  ieee: 'D. A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, and P. R. Sharapova,
    “Spectral and temporal properties of type-II parametric down-conversion: The impact
    of losses during state generation,” <i>Physical Review Research</i>, vol. 7, no.
    3, Art. no. 033122, 2025, doi: <a href="https://doi.org/10.1103/zp72-7qwl">10.1103/zp72-7qwl</a>.'
  mla: 'Kopylov, Denis A., et al. “Spectral and Temporal Properties of Type-II Parametric
    down-Conversion: The Impact of Losses during State Generation.” <i>Physical Review
    Research</i>, vol. 7, no. 3, 033122, American Physical Society (APS), 2025, doi:<a
    href="https://doi.org/10.1103/zp72-7qwl">10.1103/zp72-7qwl</a>.'
  short: D.A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, P.R. Sharapova, Physical
    Review Research 7 (2025).
date_created: 2025-12-05T09:33:36Z
date_updated: 2025-12-05T09:55:22Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '293'
- _id: '288'
- _id: '230'
- _id: '623'
- _id: '429'
- _id: '35'
doi: 10.1103/zp72-7qwl
intvolume: '         7'
issue: '3'
language:
- iso: eng
project:
- _id: '266'
  name: 'PhoQC: Photonisches Quantencomputing'
- _id: '53'
  name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
    zu funktionellen Strukturen'
- _id: '56'
  name: TRR 142 - Project Area C
- _id: '174'
  name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen
    Systemen: Eine theoretische Analyse'
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Spectral and temporal properties of type-II parametric down-conversion: The
  impact of losses during state generation'
type: journal_article
user_id: '16199'
volume: 7
year: '2025'
...
---
_id: '62980'
abstract:
- lang: eng
  text: <jats:p>We introduce a new classification of multimode states with a fixed
    number of photons. This classification is based on the factorizability of homogeneous
    multivariate polynomials and is invariant under unitary transformations. The classes
    physically correspond to field excitations in terms of single and multiple photons,
    each of which is in an arbitrary irreducible superposition of quantized modes.
    We further show how the transitions between classes are rendered possible by photon
    addition, photon subtraction, and photon-projection nonlinearities. We explicitly
    put forward a design for a multilayer interferometer in which the states for different
    classes can be generated with state-of-the-art experimental techniques. Limitations
    of the proposed designs are analyzed using the introduced classification, providing
    a benchmark for the robustness of certain states and classes.</jats:p>
article_number: '033062'
author:
- first_name: Denis A.
  full_name: Kopylov, Denis A.
  last_name: Kopylov
- first_name: Christian
  full_name: Offen, Christian
  id: '85279'
  last_name: Offen
  orcid: 0000-0002-5940-8057
- first_name: Laura
  full_name: Ares, Laura
  last_name: Ares
- first_name: Boris Edgar
  full_name: Wembe Moafo, Boris Edgar
  id: '95394'
  last_name: Wembe Moafo
- first_name: Sina
  full_name: Ober-Blöbaum, Sina
  id: '16494'
  last_name: Ober-Blöbaum
- first_name: Torsten
  full_name: Meier, Torsten
  id: '344'
  last_name: Meier
  orcid: 0000-0001-8864-2072
- first_name: Polina R.
  full_name: Sharapova, Polina R.
  id: '60286'
  last_name: Sharapova
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
citation:
  ama: Kopylov DA, Offen C, Ares L, et al. Multiphoton, multimode state classification
    for nonlinear optical circuits. <i>Physical Review Research</i>. 2025;7(3). doi:<a
    href="https://doi.org/10.1103/sv6z-v1gk">10.1103/sv6z-v1gk</a>
  apa: Kopylov, D. A., Offen, C., Ares, L., Wembe Moafo, B. E., Ober-Blöbaum, S.,
    Meier, T., Sharapova, P. R., &#38; Sperling, J. (2025). Multiphoton, multimode
    state classification for nonlinear optical circuits. <i>Physical Review Research</i>,
    <i>7</i>(3), Article 033062. <a href="https://doi.org/10.1103/sv6z-v1gk">https://doi.org/10.1103/sv6z-v1gk</a>
  bibtex: '@article{Kopylov_Offen_Ares_Wembe Moafo_Ober-Blöbaum_Meier_Sharapova_Sperling_2025,
    title={Multiphoton, multimode state classification for nonlinear optical circuits},
    volume={7}, DOI={<a href="https://doi.org/10.1103/sv6z-v1gk">10.1103/sv6z-v1gk</a>},
    number={3033062}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Kopylov, Denis A. and Offen, Christian and Ares, Laura
    and Wembe Moafo, Boris Edgar and Ober-Blöbaum, Sina and Meier, Torsten and Sharapova,
    Polina R. and Sperling, Jan}, year={2025} }'
  chicago: Kopylov, Denis A., Christian Offen, Laura Ares, Boris Edgar Wembe Moafo,
    Sina Ober-Blöbaum, Torsten Meier, Polina R. Sharapova, and Jan Sperling. “Multiphoton,
    Multimode State Classification for Nonlinear Optical Circuits.” <i>Physical Review
    Research</i> 7, no. 3 (2025). <a href="https://doi.org/10.1103/sv6z-v1gk">https://doi.org/10.1103/sv6z-v1gk</a>.
  ieee: 'D. A. Kopylov <i>et al.</i>, “Multiphoton, multimode state classification
    for nonlinear optical circuits,” <i>Physical Review Research</i>, vol. 7, no.
    3, Art. no. 033062, 2025, doi: <a href="https://doi.org/10.1103/sv6z-v1gk">10.1103/sv6z-v1gk</a>.'
  mla: Kopylov, Denis A., et al. “Multiphoton, Multimode State Classification for
    Nonlinear Optical Circuits.” <i>Physical Review Research</i>, vol. 7, no. 3, 033062,
    American Physical Society (APS), 2025, doi:<a href="https://doi.org/10.1103/sv6z-v1gk">10.1103/sv6z-v1gk</a>.
  short: D.A. Kopylov, C. Offen, L. Ares, B.E. Wembe Moafo, S. Ober-Blöbaum, T. Meier,
    P.R. Sharapova, J. Sperling, Physical Review Research 7 (2025).
date_created: 2025-12-09T09:08:39Z
date_updated: 2025-12-09T09:10:01Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '293'
- _id: '706'
- _id: '636'
- _id: '35'
- _id: '230'
- _id: '429'
- _id: '623'
doi: 10.1103/sv6z-v1gk
intvolume: '         7'
issue: '3'
language:
- iso: eng
project:
- _id: '53'
  name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
    zu funktionellen Strukturen'
- _id: '56'
  name: TRR 142 - Project Area C
- _id: '174'
  name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen
    Systemen: Eine theoretische Analyse'
- _id: '266'
  name: 'PhoQC: Photonisches Quantencomputing'
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Multiphoton, multimode state classification for nonlinear optical circuits
type: journal_article
user_id: '16199'
volume: 7
year: '2025'
...
---
_id: '63021'
abstract:
- lang: eng
  text: <jats:p>Bell measurements, entailing the projection onto one of the Bell states,
    play a key role in quantum information and communication, where the outcome of
    a variety of protocols crucially depends on the success probability of such measurements.
    Although in the case of qubit systems, Bell measurements can be implemented using
    only linear optical components, the same result is no longer true for qudits,
    where at least the use of ancillary photons is required. In order to circumvent
    this limitation, one possibility is to introduce nonlinear effects. In this work,
    we adopt the latter approach and propose a scalable Bell measurement scheme for
    high-dimensional states, exploiting multiple squeezer devices applied to a linear
    optical circuit for discriminating the different Bell states. Our approach does
    not require ancillary photons, is not limited by the dimension of the quantum
    states, and is experimentally scalable, thus paving the way toward the realization
    of an effective high-dimensional Bell measurement.</jats:p>
article_number: '023038'
author:
- first_name: Luca
  full_name: Bianchi, Luca
  last_name: Bianchi
- first_name: Carlo
  full_name: Marconi, Carlo
  last_name: Marconi
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Davide
  full_name: Bacco, Davide
  last_name: Bacco
citation:
  ama: Bianchi L, Marconi C, Sperling J, Bacco D. Predetection squeezing as a resource
    for high-dimensional Bell-state measurements. <i>Physical Review Research</i>.
    2025;7(2). doi:<a href="https://doi.org/10.1103/physrevresearch.7.023038">10.1103/physrevresearch.7.023038</a>
  apa: Bianchi, L., Marconi, C., Sperling, J., &#38; Bacco, D. (2025). Predetection
    squeezing as a resource for high-dimensional Bell-state measurements. <i>Physical
    Review Research</i>, <i>7</i>(2), Article 023038. <a href="https://doi.org/10.1103/physrevresearch.7.023038">https://doi.org/10.1103/physrevresearch.7.023038</a>
  bibtex: '@article{Bianchi_Marconi_Sperling_Bacco_2025, title={Predetection squeezing
    as a resource for high-dimensional Bell-state measurements}, volume={7}, DOI={<a
    href="https://doi.org/10.1103/physrevresearch.7.023038">10.1103/physrevresearch.7.023038</a>},
    number={2023038}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Bianchi, Luca and Marconi, Carlo and Sperling, Jan and
    Bacco, Davide}, year={2025} }'
  chicago: Bianchi, Luca, Carlo Marconi, Jan Sperling, and Davide Bacco. “Predetection
    Squeezing as a Resource for High-Dimensional Bell-State Measurements.” <i>Physical
    Review Research</i> 7, no. 2 (2025). <a href="https://doi.org/10.1103/physrevresearch.7.023038">https://doi.org/10.1103/physrevresearch.7.023038</a>.
  ieee: 'L. Bianchi, C. Marconi, J. Sperling, and D. Bacco, “Predetection squeezing
    as a resource for high-dimensional Bell-state measurements,” <i>Physical Review
    Research</i>, vol. 7, no. 2, Art. no. 023038, 2025, doi: <a href="https://doi.org/10.1103/physrevresearch.7.023038">10.1103/physrevresearch.7.023038</a>.'
  mla: Bianchi, Luca, et al. “Predetection Squeezing as a Resource for High-Dimensional
    Bell-State Measurements.” <i>Physical Review Research</i>, vol. 7, no. 2, 023038,
    American Physical Society (APS), 2025, doi:<a href="https://doi.org/10.1103/physrevresearch.7.023038">10.1103/physrevresearch.7.023038</a>.
  short: L. Bianchi, C. Marconi, J. Sperling, D. Bacco, Physical Review Research 7
    (2025).
date_created: 2025-12-10T13:34:53Z
date_updated: 2025-12-10T13:36:11Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
doi: 10.1103/physrevresearch.7.023038
intvolume: '         7'
issue: '2'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Predetection squeezing as a resource for high-dimensional Bell-state measurements
type: journal_article
user_id: '75127'
volume: 7
year: '2025'
...
---
_id: '62859'
abstract:
- lang: eng
  text: <jats:p>Frequency-filtered photon correlations have been proven to be extremely
    useful in grasping how the detection process alters photon statistics. Harnessing
    the spectral correlations also permits refinement of the emission and unraveling
    of previously hidden strong correlations in a plethora of quantum-optical systems
    under continuous-wave excitation. In this work, we investigate such correlations
    for time-dependent excitation and develop a methodology to compute efficiently
    time-integrated correlations, which are at the heart of the photon-counting theory,
    and subsequently apply it to analyze the photon emission of pulsed systems. By
    combining this formalism with the —which facilitates frequency-resolved correlations—we
    demonstrate how spectral filtering enhances single-photon purity and suppresses
    multiphoton noise in time-bin-encoded quantum states. Specifically, filtering
    the central spectral peak of a dynamically driven two-level system boosts temporal
    coherence and improves the fidelity of time-bin entanglement preparation, even
    under conditions favoring multiphoton emission. These results establish spectral
    filtering as a critical tool for tailoring photon statistics in pulsed quantum
    light sources.</jats:p>
article_number: '033296'
author:
- first_name: Santiago
  full_name: Bermúdez-Feijóo, Santiago
  last_name: Bermúdez-Feijóo
- first_name: Eduardo
  full_name: Zubizarreta Casalengua, Eduardo
  last_name: Zubizarreta Casalengua
- first_name: Kai
  full_name: Müller, Kai
  last_name: Müller
- first_name: Klaus
  full_name: Jöns, Klaus
  id: '85353'
  last_name: Jöns
citation:
  ama: Bermúdez-Feijóo S, Zubizarreta Casalengua E, Müller K, Jöns K. Spectral correlations
    of dynamical resonance fluorescence. <i>Physical Review Research</i>. 2025;7(3).
    doi:<a href="https://doi.org/10.1103/jmy9-bd3l">10.1103/jmy9-bd3l</a>
  apa: Bermúdez-Feijóo, S., Zubizarreta Casalengua, E., Müller, K., &#38; Jöns, K.
    (2025). Spectral correlations of dynamical resonance fluorescence. <i>Physical
    Review Research</i>, <i>7</i>(3), Article 033296. <a href="https://doi.org/10.1103/jmy9-bd3l">https://doi.org/10.1103/jmy9-bd3l</a>
  bibtex: '@article{Bermúdez-Feijóo_Zubizarreta Casalengua_Müller_Jöns_2025, title={Spectral
    correlations of dynamical resonance fluorescence}, volume={7}, DOI={<a href="https://doi.org/10.1103/jmy9-bd3l">10.1103/jmy9-bd3l</a>},
    number={3033296}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Bermúdez-Feijóo, Santiago and Zubizarreta Casalengua,
    Eduardo and Müller, Kai and Jöns, Klaus}, year={2025} }'
  chicago: Bermúdez-Feijóo, Santiago, Eduardo Zubizarreta Casalengua, Kai Müller,
    and Klaus Jöns. “Spectral Correlations of Dynamical Resonance Fluorescence.” <i>Physical
    Review Research</i> 7, no. 3 (2025). <a href="https://doi.org/10.1103/jmy9-bd3l">https://doi.org/10.1103/jmy9-bd3l</a>.
  ieee: 'S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, and K. Jöns, “Spectral
    correlations of dynamical resonance fluorescence,” <i>Physical Review Research</i>,
    vol. 7, no. 3, Art. no. 033296, 2025, doi: <a href="https://doi.org/10.1103/jmy9-bd3l">10.1103/jmy9-bd3l</a>.'
  mla: Bermúdez-Feijóo, Santiago, et al. “Spectral Correlations of Dynamical Resonance
    Fluorescence.” <i>Physical Review Research</i>, vol. 7, no. 3, 033296, American
    Physical Society (APS), 2025, doi:<a href="https://doi.org/10.1103/jmy9-bd3l">10.1103/jmy9-bd3l</a>.
  short: S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, K. Jöns, Physical
    Review Research 7 (2025).
date_created: 2025-12-04T12:19:04Z
date_updated: 2025-12-11T12:52:24Z
department:
- _id: '623'
- _id: '15'
- _id: '429'
- _id: '642'
doi: 10.1103/jmy9-bd3l
intvolume: '         7'
issue: '3'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Spectral correlations of dynamical resonance fluorescence
type: journal_article
user_id: '48188'
volume: 7
year: '2025'
...
---
_id: '63213'
abstract:
- lang: eng
  text: '<jats:p>Quantum uncertainty relations impose fundamental limits on the joint
    knowledge that can be acquired from complementary observables: Perfect knowledge
    of a quantum state in one basis implies maximal indetermination in all other mutually
    unbiased bases (MUBs). Uncertainty relations derived from joint properties of
    the MUBs are generally assumed to be uniform, irrespective of the specific observables
    chosen within a set. In this work, we demonstrate instead that the uncertainty
    relations can depend on the choice of observables. Through both experimental observation
    and numerical methods, we show that selecting different sets of three MUBs in
    a five-dimensional quantum system results in distinct uncertainty bounds, i.e.,
    in varying degrees of complementarity, in terms of both entropy and variance.</jats:p>'
article_number: '033152'
article_type: original
author:
- first_name: Laura Maria
  full_name: Serino, Laura Maria
  id: '88242'
  last_name: Serino
- first_name: Giovanni
  full_name: Chesi, Giovanni
  last_name: Chesi
- first_name: Benjamin
  full_name: Brecht, Benjamin
  id: '27150'
  last_name: Brecht
  orcid: '0000-0003-4140-0556 '
- first_name: Lorenzo
  full_name: Maccone, Lorenzo
  last_name: Maccone
- first_name: Chiara
  full_name: Macchiavello, Chiara
  last_name: Macchiavello
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
citation:
  ama: 'Serino LM, Chesi G, Brecht B, Maccone L, Macchiavello C, Silberhorn C. Complementarity-based
    complementarity: The choice of mutually unbiased observables shapes quantum uncertainty
    relations. <i>Physical Review Research</i>. 2025;7(3). doi:<a href="https://doi.org/10.1103/v24q-sl6n">10.1103/v24q-sl6n</a>'
  apa: 'Serino, L. M., Chesi, G., Brecht, B., Maccone, L., Macchiavello, C., &#38;
    Silberhorn, C. (2025). Complementarity-based complementarity: The choice of mutually
    unbiased observables shapes quantum uncertainty relations. <i>Physical Review
    Research</i>, <i>7</i>(3), Article 033152. <a href="https://doi.org/10.1103/v24q-sl6n">https://doi.org/10.1103/v24q-sl6n</a>'
  bibtex: '@article{Serino_Chesi_Brecht_Maccone_Macchiavello_Silberhorn_2025, title={Complementarity-based
    complementarity: The choice of mutually unbiased observables shapes quantum uncertainty
    relations}, volume={7}, DOI={<a href="https://doi.org/10.1103/v24q-sl6n">10.1103/v24q-sl6n</a>},
    number={3033152}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Serino, Laura Maria and Chesi, Giovanni and Brecht, Benjamin
    and Maccone, Lorenzo and Macchiavello, Chiara and Silberhorn, Christine}, year={2025}
    }'
  chicago: 'Serino, Laura Maria, Giovanni Chesi, Benjamin Brecht, Lorenzo Maccone,
    Chiara Macchiavello, and Christine Silberhorn. “Complementarity-Based Complementarity:
    The Choice of Mutually Unbiased Observables Shapes Quantum Uncertainty Relations.”
    <i>Physical Review Research</i> 7, no. 3 (2025). <a href="https://doi.org/10.1103/v24q-sl6n">https://doi.org/10.1103/v24q-sl6n</a>.'
  ieee: 'L. M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, and C. Silberhorn,
    “Complementarity-based complementarity: The choice of mutually unbiased observables
    shapes quantum uncertainty relations,” <i>Physical Review Research</i>, vol. 7,
    no. 3, Art. no. 033152, 2025, doi: <a href="https://doi.org/10.1103/v24q-sl6n">10.1103/v24q-sl6n</a>.'
  mla: 'Serino, Laura Maria, et al. “Complementarity-Based Complementarity: The Choice
    of Mutually Unbiased Observables Shapes Quantum Uncertainty Relations.” <i>Physical
    Review Research</i>, vol. 7, no. 3, 033152, American Physical Society (APS), 2025,
    doi:<a href="https://doi.org/10.1103/v24q-sl6n">10.1103/v24q-sl6n</a>.'
  short: L.M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, C. Silberhorn,
    Physical Review Research 7 (2025).
date_created: 2025-12-18T16:04:45Z
date_updated: 2025-12-18T16:05:45Z
department:
- _id: '15'
- _id: '623'
doi: 10.1103/v24q-sl6n
intvolume: '         7'
issue: '3'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Complementarity-based complementarity: The choice of mutually unbiased observables
  shapes quantum uncertainty relations'
type: journal_article
user_id: '27150'
volume: 7
year: '2025'
...
---
_id: '63534'
abstract:
- lang: eng
  text: <jats:p>Boson sampling is a key candidate for demonstrating quantum advantage
    and has already yielded significant advances in quantum simulation, machine learning,
    and graph theory. In this work, a unification and extension of distinct forms
    of boson sampling is developed. The devised protocol merges discrete-variable
    scattershot boson sampling with continuous-variable Gaussian boson sampling. Therefore,
    it is rendered possible to harness the complexity of more interesting states,
    such as squeezed photons, in advanced sampling protocols. A generating function
    formalism is developed for the joint description of multiphoton and multimode
    light undergoing Gaussian transformations. The resulting analytical tools enable
    one to explore interfaces of different photonic quantum-information-processing
    platforms. A numerical simulation of unified sampling is carried out, benchmarking
    its performance, complexity, and scalability. Entanglement is characterized to
    exemplify the generation of quantum correlations from the nonlinear interactions
    of a unified sampler.</jats:p>
article_number: L042068
author:
- first_name: Luca
  full_name: Bianchi, Luca
  last_name: Bianchi
- first_name: Carlo
  full_name: Marconi, Carlo
  last_name: Marconi
- first_name: Laura
  full_name: Ares, Laura
  last_name: Ares
- first_name: Davide
  full_name: Bacco, Davide
  last_name: Bacco
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
citation:
  ama: Bianchi L, Marconi C, Ares L, Bacco D, Sperling J. Unified boson sampling.
    <i>Physical Review Research</i>. 2025;7(4). doi:<a href="https://doi.org/10.1103/8hy1-m5gg">10.1103/8hy1-m5gg</a>
  apa: Bianchi, L., Marconi, C., Ares, L., Bacco, D., &#38; Sperling, J. (2025). Unified
    boson sampling. <i>Physical Review Research</i>, <i>7</i>(4), Article L042068.
    <a href="https://doi.org/10.1103/8hy1-m5gg">https://doi.org/10.1103/8hy1-m5gg</a>
  bibtex: '@article{Bianchi_Marconi_Ares_Bacco_Sperling_2025, title={Unified boson
    sampling}, volume={7}, DOI={<a href="https://doi.org/10.1103/8hy1-m5gg">10.1103/8hy1-m5gg</a>},
    number={4L042068}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Bianchi, Luca and Marconi, Carlo and Ares, Laura and Bacco,
    Davide and Sperling, Jan}, year={2025} }'
  chicago: Bianchi, Luca, Carlo Marconi, Laura Ares, Davide Bacco, and Jan Sperling.
    “Unified Boson Sampling.” <i>Physical Review Research</i> 7, no. 4 (2025). <a
    href="https://doi.org/10.1103/8hy1-m5gg">https://doi.org/10.1103/8hy1-m5gg</a>.
  ieee: 'L. Bianchi, C. Marconi, L. Ares, D. Bacco, and J. Sperling, “Unified boson
    sampling,” <i>Physical Review Research</i>, vol. 7, no. 4, Art. no. L042068, 2025,
    doi: <a href="https://doi.org/10.1103/8hy1-m5gg">10.1103/8hy1-m5gg</a>.'
  mla: Bianchi, Luca, et al. “Unified Boson Sampling.” <i>Physical Review Research</i>,
    vol. 7, no. 4, L042068, American Physical Society (APS), 2025, doi:<a href="https://doi.org/10.1103/8hy1-m5gg">10.1103/8hy1-m5gg</a>.
  short: L. Bianchi, C. Marconi, L. Ares, D. Bacco, J. Sperling, Physical Review Research
    7 (2025).
date_created: 2026-01-09T08:02:57Z
date_updated: 2026-01-09T08:03:38Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
doi: 10.1103/8hy1-m5gg
intvolume: '         7'
issue: '4'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Unified boson sampling
type: journal_article
user_id: '75127'
volume: 7
year: '2025'
...
---
_id: '50829'
article_number: L012017
author:
- first_name: Nils
  full_name: Heinisch, Nils
  id: '90283'
  last_name: Heinisch
- first_name: Nikolas
  full_name: Köcher, Nikolas
  id: '79191'
  last_name: Köcher
- first_name: David
  full_name: Bauch, David
  id: '44172'
  last_name: Bauch
- first_name: Stefan
  full_name: Schumacher, Stefan
  id: '27271'
  last_name: Schumacher
  orcid: 0000-0003-4042-4951
citation:
  ama: 'Heinisch N, Köcher N, Bauch D, Schumacher S. Swing-up dynamics in quantum
    emitter cavity systems: Near ideal single photons and entangled photon pairs.
    <i>Physical Review Research</i>. 2024;6(1). doi:<a href="https://doi.org/10.1103/PhysRevResearch.6.L012017">10.1103/PhysRevResearch.6.L012017</a>'
  apa: 'Heinisch, N., Köcher, N., Bauch, D., &#38; Schumacher, S. (2024). Swing-up
    dynamics in quantum emitter cavity systems: Near ideal single photons and entangled
    photon pairs. <i>Physical Review Research</i>, <i>6</i>(1), Article L012017. <a
    href="https://doi.org/10.1103/PhysRevResearch.6.L012017">https://doi.org/10.1103/PhysRevResearch.6.L012017</a>'
  bibtex: '@article{Heinisch_Köcher_Bauch_Schumacher_2024, title={Swing-up dynamics
    in quantum emitter cavity systems: Near ideal single photons and entangled photon
    pairs}, volume={6}, DOI={<a href="https://doi.org/10.1103/PhysRevResearch.6.L012017">10.1103/PhysRevResearch.6.L012017</a>},
    number={1L012017}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Heinisch, Nils and Köcher, Nikolas and Bauch, David and
    Schumacher, Stefan}, year={2024} }'
  chicago: 'Heinisch, Nils, Nikolas Köcher, David Bauch, and Stefan Schumacher. “Swing-up
    Dynamics in Quantum Emitter Cavity Systems: Near Ideal Single Photons and Entangled
    Photon Pairs.” <i>Physical Review Research</i> 6, no. 1 (2024). <a href="https://doi.org/10.1103/PhysRevResearch.6.L012017">https://doi.org/10.1103/PhysRevResearch.6.L012017</a>.'
  ieee: 'N. Heinisch, N. Köcher, D. Bauch, and S. Schumacher, “Swing-up dynamics in
    quantum emitter cavity systems: Near ideal single photons and entangled photon
    pairs,” <i>Physical Review Research</i>, vol. 6, no. 1, Art. no. L012017, 2024,
    doi: <a href="https://doi.org/10.1103/PhysRevResearch.6.L012017">10.1103/PhysRevResearch.6.L012017</a>.'
  mla: 'Heinisch, Nils, et al. “Swing-up Dynamics in Quantum Emitter Cavity Systems:
    Near Ideal Single Photons and Entangled Photon Pairs.” <i>Physical Review Research</i>,
    vol. 6, no. 1, L012017, American Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/PhysRevResearch.6.L012017">10.1103/PhysRevResearch.6.L012017</a>.'
  short: N. Heinisch, N. Köcher, D. Bauch, S. Schumacher, Physical Review Research
    6 (2024).
date_created: 2024-01-24T15:17:37Z
date_updated: 2024-01-24T16:07:57Z
department:
- _id: '230'
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '297'
doi: 10.1103/PhysRevResearch.6.L012017
intvolume: '         6'
issue: '1'
language:
- iso: eng
project:
- _id: '173'
  grant_number: '231447078'
  name: 'TRR 142 - C09: TRR 142 - Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch
    bei Telekom Wellenlängen (C09*)'
- _id: '52'
  name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons
  and entangled photon pairs'
type: journal_article
user_id: '90283'
volume: 6
year: '2024'
...
---
_id: '55737'
abstract:
- lang: eng
  text: "<jats:p>We report on a photonic simulator of the critical state forming at
    the quantum phase transition between topologically distinct Anderson insulator
    phases. We observe a time-staggered profile in the circular photon polarization,
    which originates from the interplay of a chiral and sublattice symmetry, and has
    recently been suggested as a signature for topological Anderson criticality within
    the setup. We discuss the role of statistical detuning from criticality and show
    that the controlled breaking of phase coherence removes the signal, revealing
    its origin in quantum coherence.</jats:p>\r\n          <jats:sec>\r\n            <jats:title/>\r\n
    \           <jats:supplementary-material>\r\n              <jats:permissions>\r\n
    \               <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>\r\n
    \               <jats:copyright-year>2024</jats:copyright-year>\r\n              </jats:permissions>\r\n
    \           </jats:supplementary-material>\r\n          </jats:sec>"
article_number: '033194'
author:
- first_name: Sonja
  full_name: Barkhofen, Sonja
  id: '48188'
  last_name: Barkhofen
- first_name: Syamsundar
  full_name: De, Syamsundar
  last_name: De
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
- first_name: Alexander
  full_name: Altland, Alexander
  last_name: Altland
- first_name: Dmitry
  full_name: Bagrets, Dmitry
  last_name: Bagrets
- first_name: Kun Woo
  full_name: Kim, Kun Woo
  last_name: Kim
- first_name: Tobias
  full_name: Micklitz, Tobias
  last_name: Micklitz
citation:
  ama: Barkhofen S, De S, Sperling J, et al. Experimental observation of topological
    quantum criticality. <i>Physical Review Research</i>. 2024;6(3). doi:<a href="https://doi.org/10.1103/physrevresearch.6.033194">10.1103/physrevresearch.6.033194</a>
  apa: Barkhofen, S., De, S., Sperling, J., Silberhorn, C., Altland, A., Bagrets,
    D., Kim, K. W., &#38; Micklitz, T. (2024). Experimental observation of topological
    quantum criticality. <i>Physical Review Research</i>, <i>6</i>(3), Article 033194.
    <a href="https://doi.org/10.1103/physrevresearch.6.033194">https://doi.org/10.1103/physrevresearch.6.033194</a>
  bibtex: '@article{Barkhofen_De_Sperling_Silberhorn_Altland_Bagrets_Kim_Micklitz_2024,
    title={Experimental observation of topological quantum criticality}, volume={6},
    DOI={<a href="https://doi.org/10.1103/physrevresearch.6.033194">10.1103/physrevresearch.6.033194</a>},
    number={3033194}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Barkhofen, Sonja and De, Syamsundar and Sperling, Jan
    and Silberhorn, Christine and Altland, Alexander and Bagrets, Dmitry and Kim,
    Kun Woo and Micklitz, Tobias}, year={2024} }'
  chicago: Barkhofen, Sonja, Syamsundar De, Jan Sperling, Christine Silberhorn, Alexander
    Altland, Dmitry Bagrets, Kun Woo Kim, and Tobias Micklitz. “Experimental Observation
    of Topological Quantum Criticality.” <i>Physical Review Research</i> 6, no. 3
    (2024). <a href="https://doi.org/10.1103/physrevresearch.6.033194">https://doi.org/10.1103/physrevresearch.6.033194</a>.
  ieee: 'S. Barkhofen <i>et al.</i>, “Experimental observation of topological quantum
    criticality,” <i>Physical Review Research</i>, vol. 6, no. 3, Art. no. 033194,
    2024, doi: <a href="https://doi.org/10.1103/physrevresearch.6.033194">10.1103/physrevresearch.6.033194</a>.'
  mla: Barkhofen, Sonja, et al. “Experimental Observation of Topological Quantum Criticality.”
    <i>Physical Review Research</i>, vol. 6, no. 3, 033194, American Physical Society
    (APS), 2024, doi:<a href="https://doi.org/10.1103/physrevresearch.6.033194">10.1103/physrevresearch.6.033194</a>.
  short: S. Barkhofen, S. De, J. Sperling, C. Silberhorn, A. Altland, D. Bagrets,
    K.W. Kim, T. Micklitz, Physical Review Research 6 (2024).
date_created: 2024-08-22T10:47:06Z
date_updated: 2024-08-22T10:47:57Z
department:
- _id: '623'
doi: 10.1103/physrevresearch.6.033194
intvolume: '         6'
issue: '3'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Experimental observation of topological quantum criticality
type: journal_article
user_id: '48188'
volume: 6
year: '2024'
...
---
_id: '61253'
abstract:
- lang: eng
  text: "<jats:p>In the SUPER scheme (Swing-UP of the quantum EmitteR population),
    excitation of a quantum emitter is achieved with two off-resonant, red-detuned
    laser pulses. This allows the generation of high-quality single photons without
    the need of complex laser stray light suppression or careful spectral filtering.
    In the present work, we extend this promising method to quantum emitters, specifically
    semiconductor quantum dots, inside a resonant optical cavity. A significant advantage
    of the SUPER scheme is identified in that it eliminates re-excitation of the quantum
    emitter by suppressing photon emission during the excitation cycle. This, in turn,
    leads to almost ideal single-photon purity, overcoming a major factor typically
    limiting the quality of photons generated with quantum emitters in high-quality
    cavities. We further find that for cavity-mediated biexciton emission of degenerate
    photon pairs, the SUPER scheme leads to near-perfect biexciton initialization
    with very high values of polarization entanglement of emitted photon pairs.</jats:p>\r\n
    \         <jats:sec>\r\n            <jats:title/>\r\n            <jats:supplementary-material>\r\n
    \             <jats:permissions>\r\n                <jats:copyright-statement>Published
    by the American Physical Society</jats:copyright-statement>\r\n                <jats:copyright-year>2024</jats:copyright-year>\r\n
    \             </jats:permissions>\r\n            </jats:supplementary-material>\r\n
    \         </jats:sec>"
article_number: L012017
author:
- first_name: Nils
  full_name: Heinisch, Nils
  id: '90283'
  last_name: Heinisch
  orcid: 0009-0006-0984-2097
- first_name: Nikolas
  full_name: Köcher, Nikolas
  id: '79191'
  last_name: Köcher
- first_name: David
  full_name: Bauch, David
  last_name: Bauch
- first_name: Stefan
  full_name: Schumacher, Stefan
  id: '27271'
  last_name: Schumacher
  orcid: 0000-0003-4042-4951
citation:
  ama: 'Heinisch N, Köcher N, Bauch D, Schumacher S. Swing-up dynamics in quantum
    emitter cavity systems: Near ideal single photons and entangled photon pairs.
    <i>Physical Review Research</i>. 2024;6(1). doi:<a href="https://doi.org/10.1103/physrevresearch.6.l012017">10.1103/physrevresearch.6.l012017</a>'
  apa: 'Heinisch, N., Köcher, N., Bauch, D., &#38; Schumacher, S. (2024). Swing-up
    dynamics in quantum emitter cavity systems: Near ideal single photons and entangled
    photon pairs. <i>Physical Review Research</i>, <i>6</i>(1), Article L012017. <a
    href="https://doi.org/10.1103/physrevresearch.6.l012017">https://doi.org/10.1103/physrevresearch.6.l012017</a>'
  bibtex: '@article{Heinisch_Köcher_Bauch_Schumacher_2024, title={Swing-up dynamics
    in quantum emitter cavity systems: Near ideal single photons and entangled photon
    pairs}, volume={6}, DOI={<a href="https://doi.org/10.1103/physrevresearch.6.l012017">10.1103/physrevresearch.6.l012017</a>},
    number={1L012017}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Heinisch, Nils and Köcher, Nikolas and Bauch, David and
    Schumacher, Stefan}, year={2024} }'
  chicago: 'Heinisch, Nils, Nikolas Köcher, David Bauch, and Stefan Schumacher. “Swing-up
    Dynamics in Quantum Emitter Cavity Systems: Near Ideal Single Photons and Entangled
    Photon Pairs.” <i>Physical Review Research</i> 6, no. 1 (2024). <a href="https://doi.org/10.1103/physrevresearch.6.l012017">https://doi.org/10.1103/physrevresearch.6.l012017</a>.'
  ieee: 'N. Heinisch, N. Köcher, D. Bauch, and S. Schumacher, “Swing-up dynamics in
    quantum emitter cavity systems: Near ideal single photons and entangled photon
    pairs,” <i>Physical Review Research</i>, vol. 6, no. 1, Art. no. L012017, 2024,
    doi: <a href="https://doi.org/10.1103/physrevresearch.6.l012017">10.1103/physrevresearch.6.l012017</a>.'
  mla: 'Heinisch, Nils, et al. “Swing-up Dynamics in Quantum Emitter Cavity Systems:
    Near Ideal Single Photons and Entangled Photon Pairs.” <i>Physical Review Research</i>,
    vol. 6, no. 1, L012017, American Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/physrevresearch.6.l012017">10.1103/physrevresearch.6.l012017</a>.'
  short: N. Heinisch, N. Köcher, D. Bauch, S. Schumacher, Physical Review Research
    6 (2024).
date_created: 2025-09-12T11:16:31Z
date_updated: 2025-09-12T11:18:05Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '35'
- _id: '230'
- _id: '429'
- _id: '27'
doi: 10.1103/physrevresearch.6.l012017
intvolume: '         6'
issue: '1'
language:
- iso: eng
project:
- _id: '52'
  name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '53'
  name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
    zu funktionellen Strukturen'
- _id: '56'
  name: TRR 142 - Project Area C
- _id: '173'
  name: 'TRR 142; TP C09: Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch
    bei Telekom Wellenlängen'
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons
  and entangled photon pairs'
type: journal_article
user_id: '16199'
volume: 6
year: '2024'
...
---
_id: '61257'
abstract:
- lang: eng
  text: "<jats:p>Exceptional points (EPs), with their intriguing spectral topology,
    have attracted considerable attention in a broad range of physical systems, with
    potential sensing applications driving much of the present research in this field.
    Here, we investigate spectral topology and EPs in systems with significant nonlinearity,
    exemplified by a nonequilibrium exciton-polariton condensate. With the possibility
    to control loss and gain and nonlinearity by optical means, this system allows
    for a comprehensive analysis of the interplay of nonlinearities (Kerr type and
    saturable gain) and non-Hermiticity. Not only do we find that EPs can be intentionally
    shifted in parameter space by the saturable gain, but we also observe intriguing
    rotations and intersections of Riemann surfaces and find nonlinearity-enhanced
    sensing capabilities. With this, our results illustrate the potential of tailoring
    spectral topology and related phenomena in non-Hermitian systems by nonlinearity.</jats:p>\r\n
    \         <jats:sec>\r\n            <jats:title/>\r\n            <jats:supplementary-material>\r\n
    \             <jats:permissions>\r\n                <jats:copyright-statement>Published
    by the American Physical Society</jats:copyright-statement>\r\n                <jats:copyright-year>2024</jats:copyright-year>\r\n
    \             </jats:permissions>\r\n            </jats:supplementary-material>\r\n
    \         </jats:sec>"
article_number: '013148'
author:
- first_name: Jan
  full_name: Wingenbach, Jan
  id: '69187'
  last_name: Wingenbach
- first_name: Stefan
  full_name: Schumacher, Stefan
  id: '27271'
  last_name: Schumacher
  orcid: 0000-0003-4042-4951
- first_name: Xuekai
  full_name: Ma, Xuekai
  id: '59416'
  last_name: Ma
citation:
  ama: Wingenbach J, Schumacher S, Ma X. Manipulating spectral topology and exceptional
    points by nonlinearity in non-Hermitian polariton systems. <i>Physical Review
    Research</i>. 2024;6(1). doi:<a href="https://doi.org/10.1103/physrevresearch.6.013148">10.1103/physrevresearch.6.013148</a>
  apa: Wingenbach, J., Schumacher, S., &#38; Ma, X. (2024). Manipulating spectral
    topology and exceptional points by nonlinearity in non-Hermitian polariton systems.
    <i>Physical Review Research</i>, <i>6</i>(1), Article 013148. <a href="https://doi.org/10.1103/physrevresearch.6.013148">https://doi.org/10.1103/physrevresearch.6.013148</a>
  bibtex: '@article{Wingenbach_Schumacher_Ma_2024, title={Manipulating spectral topology
    and exceptional points by nonlinearity in non-Hermitian polariton systems}, volume={6},
    DOI={<a href="https://doi.org/10.1103/physrevresearch.6.013148">10.1103/physrevresearch.6.013148</a>},
    number={1013148}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Wingenbach, Jan and Schumacher, Stefan and Ma, Xuekai},
    year={2024} }'
  chicago: Wingenbach, Jan, Stefan Schumacher, and Xuekai Ma. “Manipulating Spectral
    Topology and Exceptional Points by Nonlinearity in Non-Hermitian Polariton Systems.”
    <i>Physical Review Research</i> 6, no. 1 (2024). <a href="https://doi.org/10.1103/physrevresearch.6.013148">https://doi.org/10.1103/physrevresearch.6.013148</a>.
  ieee: 'J. Wingenbach, S. Schumacher, and X. Ma, “Manipulating spectral topology
    and exceptional points by nonlinearity in non-Hermitian polariton systems,” <i>Physical
    Review Research</i>, vol. 6, no. 1, Art. no. 013148, 2024, doi: <a href="https://doi.org/10.1103/physrevresearch.6.013148">10.1103/physrevresearch.6.013148</a>.'
  mla: Wingenbach, Jan, et al. “Manipulating Spectral Topology and Exceptional Points
    by Nonlinearity in Non-Hermitian Polariton Systems.” <i>Physical Review Research</i>,
    vol. 6, no. 1, 013148, American Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/physrevresearch.6.013148">10.1103/physrevresearch.6.013148</a>.
  short: J. Wingenbach, S. Schumacher, X. Ma, Physical Review Research 6 (2024).
date_created: 2025-09-12T11:23:33Z
date_updated: 2025-09-12T11:24:59Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '705'
- _id: '35'
- _id: '230'
- _id: '27'
- _id: '429'
doi: 10.1103/physrevresearch.6.013148
intvolume: '         6'
issue: '1'
language:
- iso: eng
project:
- _id: '52'
  name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '53'
  name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
    zu funktionellen Strukturen'
- _id: '54'
  name: TRR 142 - Project Area A
- _id: '61'
  name: 'TRR 142; TP A04: Nichtlineare Quantenprozesstomographie und Photonik mit
    Polaritonen in Mikrokavitäten'
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian
  polariton systems
type: journal_article
user_id: '16199'
volume: 6
year: '2024'
...
---
_id: '52876'
article_number: L012043
author:
- first_name: Christian
  full_name: Arends, Christian
  id: '43994'
  last_name: Arends
- first_name: Lasse Lennart
  full_name: Wolf, Lasse Lennart
  id: '45027'
  last_name: Wolf
  orcid: 0000-0001-8893-2045
- first_name: Jasmin
  full_name: Meinecke, Jasmin
  last_name: Meinecke
- first_name: Sonja
  full_name: Barkhofen, Sonja
  id: '48188'
  last_name: Barkhofen
- first_name: Tobias
  full_name: Weich, Tobias
  id: '49178'
  last_name: Weich
  orcid: 0000-0002-9648-6919
- first_name: Tim
  full_name: Bartley, Tim
  id: '49683'
  last_name: Bartley
citation:
  ama: Arends C, Wolf LL, Meinecke J, Barkhofen S, Weich T, Bartley T. Decomposing
    large unitaries into multimode devices of arbitrary size. <i>Physical Review Research</i>.
    2024;6(1). doi:<a href="https://doi.org/10.1103/physrevresearch.6.l012043">10.1103/physrevresearch.6.l012043</a>
  apa: Arends, C., Wolf, L. L., Meinecke, J., Barkhofen, S., Weich, T., &#38; Bartley,
    T. (2024). Decomposing large unitaries into multimode devices of arbitrary size.
    <i>Physical Review Research</i>, <i>6</i>(1), Article L012043. <a href="https://doi.org/10.1103/physrevresearch.6.l012043">https://doi.org/10.1103/physrevresearch.6.l012043</a>
  bibtex: '@article{Arends_Wolf_Meinecke_Barkhofen_Weich_Bartley_2024, title={Decomposing
    large unitaries into multimode devices of arbitrary size}, volume={6}, DOI={<a
    href="https://doi.org/10.1103/physrevresearch.6.l012043">10.1103/physrevresearch.6.l012043</a>},
    number={1L012043}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Arends, Christian and Wolf, Lasse Lennart and Meinecke,
    Jasmin and Barkhofen, Sonja and Weich, Tobias and Bartley, Tim}, year={2024} }'
  chicago: Arends, Christian, Lasse Lennart Wolf, Jasmin Meinecke, Sonja Barkhofen,
    Tobias Weich, and Tim Bartley. “Decomposing Large Unitaries into Multimode Devices
    of Arbitrary Size.” <i>Physical Review Research</i> 6, no. 1 (2024). <a href="https://doi.org/10.1103/physrevresearch.6.l012043">https://doi.org/10.1103/physrevresearch.6.l012043</a>.
  ieee: 'C. Arends, L. L. Wolf, J. Meinecke, S. Barkhofen, T. Weich, and T. Bartley,
    “Decomposing large unitaries into multimode devices of arbitrary size,” <i>Physical
    Review Research</i>, vol. 6, no. 1, Art. no. L012043, 2024, doi: <a href="https://doi.org/10.1103/physrevresearch.6.l012043">10.1103/physrevresearch.6.l012043</a>.'
  mla: Arends, Christian, et al. “Decomposing Large Unitaries into Multimode Devices
    of Arbitrary Size.” <i>Physical Review Research</i>, vol. 6, no. 1, L012043, American
    Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/physrevresearch.6.l012043">10.1103/physrevresearch.6.l012043</a>.
  short: C. Arends, L.L. Wolf, J. Meinecke, S. Barkhofen, T. Weich, T. Bartley, Physical
    Review Research 6 (2024).
date_created: 2024-03-26T08:52:05Z
date_updated: 2025-12-04T13:38:49Z
department:
- _id: '623'
- _id: '15'
doi: 10.1103/physrevresearch.6.l012043
intvolume: '         6'
issue: '1'
keyword:
- General Physics and Astronomy
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Decomposing large unitaries into multimode devices of arbitrary size
type: journal_article
user_id: '48188'
volume: 6
year: '2024'
...
---
_id: '54288'
abstract:
- lang: eng
  text: "<jats:p>The ability to apply user-chosen large-scale unitary operations with
    high fidelity to a quantum state is key to realizing future photonic quantum technologies.
    Here, we realize the implementation of programmable unitary operations on up to
    64 frequency-bin modes. To benchmark the performance of our system, we probe different
    quantum walk unitary operations, in particular, Grover walks on four-dimensional
    hypercubes with similarities exceeding 95% and quantum walks with 400 steps on
    circles and finite lines with similarities of 98%. Our results open a path toward
    implementing high-quality unitary operations, which can form the basis for applications
    in complex tasks, such as Gaussian boson sampling.</jats:p>\r\n          <jats:sec>\r\n
    \           <jats:title/>\r\n            <jats:supplementary-material>\r\n              <jats:permissions>\r\n
    \               <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>\r\n
    \               <jats:copyright-year>2024</jats:copyright-year>\r\n              </jats:permissions>\r\n
    \           </jats:supplementary-material>\r\n          </jats:sec>"
article_number: L022040
author:
- first_name: Syamsundar
  full_name: De, Syamsundar
  last_name: De
- first_name: Vahid
  full_name: Ansari, Vahid
  last_name: Ansari
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Sonja
  full_name: Barkhofen, Sonja
  id: '48188'
  last_name: Barkhofen
- first_name: Benjamin
  full_name: Brecht, Benjamin
  id: '27150'
  last_name: Brecht
  orcid: '0000-0003-4140-0556 '
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
citation:
  ama: De S, Ansari V, Sperling J, Barkhofen S, Brecht B, Silberhorn C. Realization
    of high-fidelity unitary operations on up to 64 frequency bins. <i>Physical Review
    Research</i>. 2024;6(2). doi:<a href="https://doi.org/10.1103/physrevresearch.6.l022040">10.1103/physrevresearch.6.l022040</a>
  apa: De, S., Ansari, V., Sperling, J., Barkhofen, S., Brecht, B., &#38; Silberhorn,
    C. (2024). Realization of high-fidelity unitary operations on up to 64 frequency
    bins. <i>Physical Review Research</i>, <i>6</i>(2), Article L022040. <a href="https://doi.org/10.1103/physrevresearch.6.l022040">https://doi.org/10.1103/physrevresearch.6.l022040</a>
  bibtex: '@article{De_Ansari_Sperling_Barkhofen_Brecht_Silberhorn_2024, title={Realization
    of high-fidelity unitary operations on up to 64 frequency bins}, volume={6}, DOI={<a
    href="https://doi.org/10.1103/physrevresearch.6.l022040">10.1103/physrevresearch.6.l022040</a>},
    number={2L022040}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={De, Syamsundar and Ansari, Vahid and Sperling, Jan and
    Barkhofen, Sonja and Brecht, Benjamin and Silberhorn, Christine}, year={2024}
    }'
  chicago: De, Syamsundar, Vahid Ansari, Jan Sperling, Sonja Barkhofen, Benjamin Brecht,
    and Christine Silberhorn. “Realization of High-Fidelity Unitary Operations on
    up to 64 Frequency Bins.” <i>Physical Review Research</i> 6, no. 2 (2024). <a
    href="https://doi.org/10.1103/physrevresearch.6.l022040">https://doi.org/10.1103/physrevresearch.6.l022040</a>.
  ieee: 'S. De, V. Ansari, J. Sperling, S. Barkhofen, B. Brecht, and C. Silberhorn,
    “Realization of high-fidelity unitary operations on up to 64 frequency bins,”
    <i>Physical Review Research</i>, vol. 6, no. 2, Art. no. L022040, 2024, doi: <a
    href="https://doi.org/10.1103/physrevresearch.6.l022040">10.1103/physrevresearch.6.l022040</a>.'
  mla: De, Syamsundar, et al. “Realization of High-Fidelity Unitary Operations on
    up to 64 Frequency Bins.” <i>Physical Review Research</i>, vol. 6, no. 2, L022040,
    American Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/physrevresearch.6.l022040">10.1103/physrevresearch.6.l022040</a>.
  short: S. De, V. Ansari, J. Sperling, S. Barkhofen, B. Brecht, C. Silberhorn, Physical
    Review Research 6 (2024).
date_created: 2024-05-14T12:40:48Z
date_updated: 2025-12-18T16:14:39Z
department:
- _id: '623'
- _id: '288'
- _id: '15'
doi: 10.1103/physrevresearch.6.l022040
intvolume: '         6'
issue: '2'
language:
- iso: eng
project:
- _id: '216'
  name: 'QuPoPCoRN: QUPOPCORN: Quantum Particles on Programmable Complex Reconfigurable
    Networks'
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Realization of high-fidelity unitary operations on up to 64 frequency bins
type: journal_article
user_id: '27150'
volume: 6
year: '2024'
...
---
_id: '59272'
abstract:
- lang: eng
  text: 'Ferroelectrics such as LiNbO3 (LN) are wide-band-gap insulators that may
    show a high local electric conductivity at the domain walls (DWs). The latter
    are interfaces separating regions of noncollinear polarization, which can be manipulated
    to build integrated nanoelectronic elements. In the present work, we model different
    DW types in LN from first principles. Our models reveal the DW morphology and
    shed light on their electronic properties: A strong band bending is predicted
    for charged DWs, leading to local metallicity. Defect trapping at the DW may further
    enhance the electric conductivity.'
article_number: L042015
author:
- first_name: Leonard M.
  full_name: Verhoff, Leonard M.
  last_name: Verhoff
- first_name: Mike N.
  full_name: Pionteck, Mike N.
  last_name: Pionteck
- first_name: Michael
  full_name: Rüsing, Michael
  id: '22501'
  last_name: Rüsing
  orcid: 0000-0003-4682-4577
- first_name: Holger
  full_name: Fritze, Holger
  last_name: Fritze
- first_name: Lukas M.
  full_name: Eng, Lukas M.
  last_name: Eng
- first_name: Simone
  full_name: Sanna, Simone
  last_name: Sanna
citation:
  ama: 'Verhoff LM, Pionteck MN, Rüsing M, Fritze H, Eng LM, Sanna S. Two-dimensional
    electronic conductivity in insulating ferroelectrics: Peculiar properties of domain
    walls. <i>Physical Review Research</i>. 2024;6(4). doi:<a href="https://doi.org/10.1103/physrevresearch.6.l042015">10.1103/physrevresearch.6.l042015</a>'
  apa: 'Verhoff, L. M., Pionteck, M. N., Rüsing, M., Fritze, H., Eng, L. M., &#38;
    Sanna, S. (2024). Two-dimensional electronic conductivity in insulating ferroelectrics:
    Peculiar properties of domain walls. <i>Physical Review Research</i>, <i>6</i>(4),
    Article L042015. <a href="https://doi.org/10.1103/physrevresearch.6.l042015">https://doi.org/10.1103/physrevresearch.6.l042015</a>'
  bibtex: '@article{Verhoff_Pionteck_Rüsing_Fritze_Eng_Sanna_2024, title={Two-dimensional
    electronic conductivity in insulating ferroelectrics: Peculiar properties of domain
    walls}, volume={6}, DOI={<a href="https://doi.org/10.1103/physrevresearch.6.l042015">10.1103/physrevresearch.6.l042015</a>},
    number={4L042015}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Verhoff, Leonard M. and Pionteck, Mike N. and Rüsing,
    Michael and Fritze, Holger and Eng, Lukas M. and Sanna, Simone}, year={2024} }'
  chicago: 'Verhoff, Leonard M., Mike N. Pionteck, Michael Rüsing, Holger Fritze,
    Lukas M. Eng, and Simone Sanna. “Two-Dimensional Electronic Conductivity in Insulating
    Ferroelectrics: Peculiar Properties of Domain Walls.” <i>Physical Review Research</i>
    6, no. 4 (2024). <a href="https://doi.org/10.1103/physrevresearch.6.l042015">https://doi.org/10.1103/physrevresearch.6.l042015</a>.'
  ieee: 'L. M. Verhoff, M. N. Pionteck, M. Rüsing, H. Fritze, L. M. Eng, and S. Sanna,
    “Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar
    properties of domain walls,” <i>Physical Review Research</i>, vol. 6, no. 4, Art.
    no. L042015, 2024, doi: <a href="https://doi.org/10.1103/physrevresearch.6.l042015">10.1103/physrevresearch.6.l042015</a>.'
  mla: 'Verhoff, Leonard M., et al. “Two-Dimensional Electronic Conductivity in Insulating
    Ferroelectrics: Peculiar Properties of Domain Walls.” <i>Physical Review Research</i>,
    vol. 6, no. 4, L042015, American Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/physrevresearch.6.l042015">10.1103/physrevresearch.6.l042015</a>.'
  short: L.M. Verhoff, M.N. Pionteck, M. Rüsing, H. Fritze, L.M. Eng, S. Sanna, Physical
    Review Research 6 (2024).
date_created: 2025-04-02T16:08:55Z
date_updated: 2025-04-02T16:10:59Z
department:
- _id: '623'
- _id: '288'
- _id: '15'
doi: 10.1103/physrevresearch.6.l042015
intvolume: '         6'
issue: '4'
language:
- iso: eng
main_file_link:
- url: https://jlupub.ub.uni-giessen.de/server/api/core/bitstreams/fb2b09e6-c0f8-4209-99a1-79fc81d9b1f9/content
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar
  properties of domain walls'
type: journal_article
user_id: '22501'
volume: 6
year: '2024'
...
---
_id: '49117'
article_number: '043158'
author:
- first_name: D.
  full_name: Scharwald, D.
  last_name: Scharwald
- first_name: T.
  full_name: Meier, T.
  last_name: Meier
- first_name: P. R.
  full_name: Sharapova, P. R.
  last_name: Sharapova
citation:
  ama: Scharwald D, Meier T, Sharapova PR. Phase sensitivity of spatially broadband
    high-gain &#60;mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"&#62;&#60;mml:mrow&#62;&#60;mml:mi&#62;SU&#60;/mml:mi&#62;&#60;mml:mo&#62;(&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;,&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;)&#60;/mml:mo&#62;&#60;/mml:mrow&#62;&#60;/mml:math&#62;
    interferometers. <i>Physical Review Research</i>. 2023;5(4). doi:<a href="https://doi.org/10.1103/physrevresearch.5.043158">10.1103/physrevresearch.5.043158</a>
  apa: Scharwald, D., Meier, T., &#38; Sharapova, P. R. (2023). Phase sensitivity
    of spatially broadband high-gain &#60;mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"&#62;&#60;mml:mrow&#62;&#60;mml:mi&#62;SU&#60;/mml:mi&#62;&#60;mml:mo&#62;(&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;,&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;)&#60;/mml:mo&#62;&#60;/mml:mrow&#62;&#60;/mml:math&#62;
    interferometers. <i>Physical Review Research</i>, <i>5</i>(4), Article 043158.
    <a href="https://doi.org/10.1103/physrevresearch.5.043158">https://doi.org/10.1103/physrevresearch.5.043158</a>
  bibtex: '@article{Scharwald_Meier_Sharapova_2023, title={Phase sensitivity of spatially
    broadband high-gain &#60;mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"&#62;&#60;mml:mrow&#62;&#60;mml:mi&#62;SU&#60;/mml:mi&#62;&#60;mml:mo&#62;(&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;,&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;)&#60;/mml:mo&#62;&#60;/mml:mrow&#62;&#60;/mml:math&#62;
    interferometers}, volume={5}, DOI={<a href="https://doi.org/10.1103/physrevresearch.5.043158">10.1103/physrevresearch.5.043158</a>},
    number={4043158}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Scharwald, D. and Meier, T. and Sharapova, P. R.}, year={2023}
    }'
  chicago: Scharwald, D., T. Meier, and P. R. Sharapova. “Phase Sensitivity of Spatially
    Broadband High-Gain &#60;mml:Math Xmlns:Mml="http://Www.W3.Org/1998/Math/MathML"&#62;&#60;mml:Mrow&#62;&#60;mml:Mi&#62;SU&#60;/Mml:Mi&#62;&#60;mml:Mo&#62;(&#60;/Mml:Mo&#62;&#60;mml:Mn&#62;1&#60;/Mml:Mn&#62;&#60;mml:Mo&#62;,&#60;/Mml:Mo&#62;&#60;mml:Mn&#62;1&#60;/Mml:Mn&#62;&#60;mml:Mo&#62;)&#60;/Mml:Mo&#62;&#60;/Mml:Mrow&#62;&#60;/Mml:Math&#62;
    Interferometers.” <i>Physical Review Research</i> 5, no. 4 (2023). <a href="https://doi.org/10.1103/physrevresearch.5.043158">https://doi.org/10.1103/physrevresearch.5.043158</a>.
  ieee: 'D. Scharwald, T. Meier, and P. R. Sharapova, “Phase sensitivity of spatially
    broadband high-gain &#60;mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"&#62;&#60;mml:mrow&#62;&#60;mml:mi&#62;SU&#60;/mml:mi&#62;&#60;mml:mo&#62;(&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;,&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;)&#60;/mml:mo&#62;&#60;/mml:mrow&#62;&#60;/mml:math&#62;
    interferometers,” <i>Physical Review Research</i>, vol. 5, no. 4, Art. no. 043158,
    2023, doi: <a href="https://doi.org/10.1103/physrevresearch.5.043158">10.1103/physrevresearch.5.043158</a>.'
  mla: Scharwald, D., et al. “Phase Sensitivity of Spatially Broadband High-Gain &#60;mml:Math
    Xmlns:Mml="http://Www.W3.Org/1998/Math/MathML"&#62;&#60;mml:Mrow&#62;&#60;mml:Mi&#62;SU&#60;/Mml:Mi&#62;&#60;mml:Mo&#62;(&#60;/Mml:Mo&#62;&#60;mml:Mn&#62;1&#60;/Mml:Mn&#62;&#60;mml:Mo&#62;,&#60;/Mml:Mo&#62;&#60;mml:Mn&#62;1&#60;/Mml:Mn&#62;&#60;mml:Mo&#62;)&#60;/Mml:Mo&#62;&#60;/Mml:Mrow&#62;&#60;/Mml:Math&#62;
    Interferometers.” <i>Physical Review Research</i>, vol. 5, no. 4, 043158, American
    Physical Society (APS), 2023, doi:<a href="https://doi.org/10.1103/physrevresearch.5.043158">10.1103/physrevresearch.5.043158</a>.
  short: D. Scharwald, T. Meier, P.R. Sharapova, Physical Review Research 5 (2023).
date_created: 2023-11-22T09:18:02Z
date_updated: 2023-11-22T09:19:02Z
department:
- _id: '15'
- _id: '170'
- _id: '230'
- _id: '569'
- _id: '429'
doi: 10.1103/physrevresearch.5.043158
intvolume: '         5'
issue: '4'
keyword:
- General Physics and Astronomy
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Phase sensitivity of spatially broadband high-gain <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>SU</mml:mi><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mo>,</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>
  interferometers
type: journal_article
user_id: '60286'
volume: 5
year: '2023'
...
---
_id: '52122'
article_number: '043152'
author:
- first_name: Usman
  full_name: Ali, Usman
  last_name: Ali
- first_name: Martin
  full_name: Holthaus, Martin
  last_name: Holthaus
- first_name: Torsten
  full_name: Meier, Torsten
  id: '344'
  last_name: Meier
  orcid: 0000-0001-8864-2072
citation:
  ama: Ali U, Holthaus M, Meier T. Chirped Bloch-harmonic oscillations in a parametrically
    forced optical lattice. <i>Physical Review Research</i>. 2023;5(4). doi:<a href="https://doi.org/10.1103/physrevresearch.5.043152">10.1103/physrevresearch.5.043152</a>
  apa: Ali, U., Holthaus, M., &#38; Meier, T. (2023). Chirped Bloch-harmonic oscillations
    in a parametrically forced optical lattice. <i>Physical Review Research</i>, <i>5</i>(4),
    Article 043152. <a href="https://doi.org/10.1103/physrevresearch.5.043152">https://doi.org/10.1103/physrevresearch.5.043152</a>
  bibtex: '@article{Ali_Holthaus_Meier_2023, title={Chirped Bloch-harmonic oscillations
    in a parametrically forced optical lattice}, volume={5}, DOI={<a href="https://doi.org/10.1103/physrevresearch.5.043152">10.1103/physrevresearch.5.043152</a>},
    number={4043152}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Ali, Usman and Holthaus, Martin and Meier, Torsten}, year={2023}
    }'
  chicago: Ali, Usman, Martin Holthaus, and Torsten Meier. “Chirped Bloch-Harmonic
    Oscillations in a Parametrically Forced Optical Lattice.” <i>Physical Review Research</i>
    5, no. 4 (2023). <a href="https://doi.org/10.1103/physrevresearch.5.043152">https://doi.org/10.1103/physrevresearch.5.043152</a>.
  ieee: 'U. Ali, M. Holthaus, and T. Meier, “Chirped Bloch-harmonic oscillations in
    a parametrically forced optical lattice,” <i>Physical Review Research</i>, vol.
    5, no. 4, Art. no. 043152, 2023, doi: <a href="https://doi.org/10.1103/physrevresearch.5.043152">10.1103/physrevresearch.5.043152</a>.'
  mla: Ali, Usman, et al. “Chirped Bloch-Harmonic Oscillations in a Parametrically
    Forced Optical Lattice.” <i>Physical Review Research</i>, vol. 5, no. 4, 043152,
    American Physical Society (APS), 2023, doi:<a href="https://doi.org/10.1103/physrevresearch.5.043152">10.1103/physrevresearch.5.043152</a>.
  short: U. Ali, M. Holthaus, T. Meier, Physical Review Research 5 (2023).
date_created: 2024-02-27T13:57:01Z
date_updated: 2024-02-28T12:53:40Z
department:
- _id: '15'
- _id: '170'
- _id: '293'
- _id: '230'
doi: 10.1103/physrevresearch.5.043152
intvolume: '         5'
issue: '4'
keyword:
- General Physics and Astronomy
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice
type: journal_article
user_id: '16199'
volume: 5
year: '2023'
...