---
_id: '65575'
abstract:
- lang: eng
  text: <jats:p>For the ever-growing field of quantum information processing, large-scale,
    efficient multiport interferometers serving as photonic processors are required.
    In this context, the suitability of quantum walks as the interferometric base
    for universal computation has been theoretically proven. In this work, we bridge
    the gap between theoretical proposals and state-of-the-art experimental capabilities
    by providing the recipe for the implementation of a universal photonic processor
    in discrete-time quantum walks. Specifically, we present the protocol for translating
    arbitrary linear transformations into the coin and step operator of a quantum
    walk and map these to the experimental parameters of the established time-multiplexed
    platform [A. Schreiber , Phys. Rev. Lett. , 050502 (2010)]. We show that our interface
    is highly scalable and resource efficient due to the hybrid encoding consisting
    of multiple degrees of freedom. Finally, we prove that our system is highly resilient
    against experimental imperfections and show that it compares favorably against
    existing architectures.</jats:p>
article_number: '054011'
author:
- first_name: Jonas
  full_name: Lammers, Jonas
  last_name: Lammers
- first_name: Laura
  full_name: Ares, Laura
  last_name: Ares
- first_name: Federico
  full_name: Pegoraro, Federico
  id: '88928'
  last_name: Pegoraro
- first_name: Philip
  full_name: Held, Philip
  id: '68236'
  last_name: Held
- first_name: Benjamin
  full_name: Brecht, Benjamin
  id: '27150'
  last_name: Brecht
  orcid: '0000-0003-4140-0556 '
- 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
citation:
  ama: Lammers J, Ares L, Pegoraro F, et al. Resource-efficient universal photonic
    processors based on time-multiplexed hybrid architectures. <i>Physical Review
    Applied</i>. 2026;25(5). doi:<a href="https://doi.org/10.1103/x99y-2sms">10.1103/x99y-2sms</a>
  apa: Lammers, J., Ares, L., Pegoraro, F., Held, P., Brecht, B., Sperling, J., &#38;
    Silberhorn, C. (2026). Resource-efficient universal photonic processors based
    on time-multiplexed hybrid architectures. <i>Physical Review Applied</i>, <i>25</i>(5),
    Article 054011. <a href="https://doi.org/10.1103/x99y-2sms">https://doi.org/10.1103/x99y-2sms</a>
  bibtex: '@article{Lammers_Ares_Pegoraro_Held_Brecht_Sperling_Silberhorn_2026, title={Resource-efficient
    universal photonic processors based on time-multiplexed hybrid architectures},
    volume={25}, DOI={<a href="https://doi.org/10.1103/x99y-2sms">10.1103/x99y-2sms</a>},
    number={5054011}, journal={Physical Review Applied}, publisher={American Physical
    Society (APS)}, author={Lammers, Jonas and Ares, Laura and Pegoraro, Federico
    and Held, Philip and Brecht, Benjamin and Sperling, Jan and Silberhorn, Christine},
    year={2026} }'
  chicago: Lammers, Jonas, Laura Ares, Federico Pegoraro, Philip Held, Benjamin Brecht,
    Jan Sperling, and Christine Silberhorn. “Resource-Efficient Universal Photonic
    Processors Based on Time-Multiplexed Hybrid Architectures.” <i>Physical Review
    Applied</i> 25, no. 5 (2026). <a href="https://doi.org/10.1103/x99y-2sms">https://doi.org/10.1103/x99y-2sms</a>.
  ieee: 'J. Lammers <i>et al.</i>, “Resource-efficient universal photonic processors
    based on time-multiplexed hybrid architectures,” <i>Physical Review Applied</i>,
    vol. 25, no. 5, Art. no. 054011, 2026, doi: <a href="https://doi.org/10.1103/x99y-2sms">10.1103/x99y-2sms</a>.'
  mla: Lammers, Jonas, et al. “Resource-Efficient Universal Photonic Processors Based
    on Time-Multiplexed Hybrid Architectures.” <i>Physical Review Applied</i>, vol.
    25, no. 5, 054011, American Physical Society (APS), 2026, doi:<a href="https://doi.org/10.1103/x99y-2sms">10.1103/x99y-2sms</a>.
  short: J. Lammers, L. Ares, F. Pegoraro, P. Held, B. Brecht, J. Sperling, C. Silberhorn,
    Physical Review Applied 25 (2026).
date_created: 2026-05-07T07:00:08Z
date_updated: 2026-05-07T07:01:09Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
doi: 10.1103/x99y-2sms
intvolume: '        25'
issue: '5'
language:
- iso: eng
publication: Physical Review Applied
publication_identifier:
  issn:
  - 2331-7019
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Resource-efficient universal photonic processors based on time-multiplexed
  hybrid architectures
type: journal_article
user_id: '75127'
volume: 25
year: '2026'
...
---
_id: '65574'
article_number: '052413'
author:
- first_name: Julien
  full_name: Pinske, Julien
  last_name: Pinske
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Klaus
  full_name: Mølmer, Klaus
  last_name: Mølmer
citation:
  ama: Pinske J, Sperling J, Mølmer K. Entangling power of nonentangling channels.
    <i>Physical Review A</i>. 2026;113(5). doi:<a href="https://doi.org/10.1103/vy93-dnc8">10.1103/vy93-dnc8</a>
  apa: Pinske, J., Sperling, J., &#38; Mølmer, K. (2026). Entangling power of nonentangling
    channels. <i>Physical Review A</i>, <i>113</i>(5), Article 052413. <a href="https://doi.org/10.1103/vy93-dnc8">https://doi.org/10.1103/vy93-dnc8</a>
  bibtex: '@article{Pinske_Sperling_Mølmer_2026, title={Entangling power of nonentangling
    channels}, volume={113}, DOI={<a href="https://doi.org/10.1103/vy93-dnc8">10.1103/vy93-dnc8</a>},
    number={5052413}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Pinske, Julien and Sperling, Jan and Mølmer, Klaus}, year={2026}
    }'
  chicago: Pinske, Julien, Jan Sperling, and Klaus Mølmer. “Entangling Power of Nonentangling
    Channels.” <i>Physical Review A</i> 113, no. 5 (2026). <a href="https://doi.org/10.1103/vy93-dnc8">https://doi.org/10.1103/vy93-dnc8</a>.
  ieee: 'J. Pinske, J. Sperling, and K. Mølmer, “Entangling power of nonentangling
    channels,” <i>Physical Review A</i>, vol. 113, no. 5, Art. no. 052413, 2026, doi:
    <a href="https://doi.org/10.1103/vy93-dnc8">10.1103/vy93-dnc8</a>.'
  mla: Pinske, Julien, et al. “Entangling Power of Nonentangling Channels.” <i>Physical
    Review A</i>, vol. 113, no. 5, 052413, American Physical Society (APS), 2026,
    doi:<a href="https://doi.org/10.1103/vy93-dnc8">10.1103/vy93-dnc8</a>.
  short: J. Pinske, J. Sperling, K. Mølmer, Physical Review A 113 (2026).
date_created: 2026-05-07T06:57:10Z
date_updated: 2026-05-07T06:58:39Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
doi: 10.1103/vy93-dnc8
intvolume: '       113'
issue: '5'
language:
- iso: eng
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Entangling power of nonentangling channels
type: journal_article
user_id: '75127'
volume: 113
year: '2026'
...
---
_id: '65777'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title>\r\n                  <jats:p>In this work,
    we address the numerical identification of entanglement in dynamical scenarios.
    To this end, we consider different programs based on the restriction of the evolution
    to the set of separable (i.e., non-entangled) states, together with the discretization
    of the space of variables for numerical computations. As a first approach, we
    apply linear splitting methods to the restricted, continuous equations of motion
    derived from variational principles. We utilize an exchange interaction Hamiltonian
    to confirm that the numerical and analytical solutions coincide in the limit of
    small time steps. The application to different Hamiltonians shows the wide applicability
    of the method to detect dynamical entanglement. To avoid the derivation of analytical
    solutions for complex dynamics, we consider variational, numerical integration
    schemes, introducing a variational discretization for Lagrangians linear in velocities.
    Here, we examine and compare two approaches: one in which the system is discretized
    before the restriction is applied, and another in which the restriction precedes
    the discretization. We find that the ‘first-discretize-then-restrict’ method becomes
    numerically unstable, already for the example of an exchange-interaction Hamiltonian,
    which can be an important consideration for the numerical analysis of constrained
    quantum dynamics. Thereby, broadly applicable numerical tools, including their
    limitations, for studying entanglement over time are established for assessing
    the entangling power of processes that are used in quantum information theory.</jats:p>"
article_number: '225303'
author:
- first_name: Christian
  full_name: Offen, Christian
  last_name: Offen
- first_name: Boris Edgar
  full_name: Wembe Moafo, Boris Edgar
  id: '95394'
  last_name: Wembe Moafo
  orcid: 0000-0002-6085-8071
- first_name: Laura
  full_name: Ares, Laura
  last_name: Ares
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Sina
  full_name: Ober-Blöbaum, Sina
  id: '16494'
  last_name: Ober-Blöbaum
citation:
  ama: 'Offen C, Wembe Moafo BE, Ares L, Sperling J, Ober-Blöbaum S. Numerical approaches
    to entangling dynamics from variational principles. <i>Journal of Physics A: Mathematical
    and Theoretical</i>. 2026;59(22). doi:<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>'
  apa: 'Offen, C., Wembe Moafo, B. E., Ares, L., Sperling, J., &#38; Ober-Blöbaum,
    S. (2026). Numerical approaches to entangling dynamics from variational principles.
    <i>Journal of Physics A: Mathematical and Theoretical</i>, <i>59</i>(22), Article
    225303. <a href="https://doi.org/10.1088/1751-8121/ae6d51">https://doi.org/10.1088/1751-8121/ae6d51</a>'
  bibtex: '@article{Offen_Wembe Moafo_Ares_Sperling_Ober-Blöbaum_2026, title={Numerical
    approaches to entangling dynamics from variational principles}, volume={59}, DOI={<a
    href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>},
    number={22225303}, journal={Journal of Physics A: Mathematical and Theoretical},
    publisher={IOP Publishing}, author={Offen, Christian and Wembe Moafo, Boris Edgar
    and Ares, Laura and Sperling, Jan and Ober-Blöbaum, Sina}, year={2026} }'
  chicago: 'Offen, Christian, Boris Edgar Wembe Moafo, Laura Ares, Jan Sperling, and
    Sina Ober-Blöbaum. “Numerical Approaches to Entangling Dynamics from Variational
    Principles.” <i>Journal of Physics A: Mathematical and Theoretical</i> 59, no.
    22 (2026). <a href="https://doi.org/10.1088/1751-8121/ae6d51">https://doi.org/10.1088/1751-8121/ae6d51</a>.'
  ieee: 'C. Offen, B. E. Wembe Moafo, L. Ares, J. Sperling, and S. Ober-Blöbaum, “Numerical
    approaches to entangling dynamics from variational principles,” <i>Journal of
    Physics A: Mathematical and Theoretical</i>, vol. 59, no. 22, Art. no. 225303,
    2026, doi: <a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>.'
  mla: 'Offen, Christian, et al. “Numerical Approaches to Entangling Dynamics from
    Variational Principles.” <i>Journal of Physics A: Mathematical and Theoretical</i>,
    vol. 59, no. 22, 225303, IOP Publishing, 2026, doi:<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>.'
  short: 'C. Offen, B.E. Wembe Moafo, L. Ares, J. Sperling, S. Ober-Blöbaum, Journal
    of Physics A: Mathematical and Theoretical 59 (2026).'
date_created: 2026-06-05T07:37:43Z
date_updated: 2026-06-05T07:38:44Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
doi: 10.1088/1751-8121/ae6d51
intvolume: '        59'
issue: '22'
language:
- iso: eng
publication: 'Journal of Physics A: Mathematical and Theoretical'
publication_identifier:
  issn:
  - 1751-8113
  - 1751-8121
publication_status: published
publisher: IOP Publishing
status: public
title: Numerical approaches to entangling dynamics from variational principles
type: journal_article
user_id: '75127'
volume: 59
year: '2026'
...
---
_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: '61245'
article_number: '032404'
author:
- first_name: Franziska
  full_name: Barkhausen, Franziska
  id: '63631'
  last_name: Barkhausen
- first_name: Laura
  full_name: Ares Santos, Laura
  last_name: Ares Santos
- first_name: Stefan
  full_name: Schumacher, Stefan
  id: '27271'
  last_name: Schumacher
  orcid: 0000-0003-4042-4951
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
citation:
  ama: 'Barkhausen F, Ares Santos L, Schumacher S, Sperling J. Entanglement between
    dependent degrees of freedom: Quasiparticle correlations. <i>Physical Review A</i>.
    2025;111(3). doi:<a href="https://doi.org/10.1103/physreva.111.032404">10.1103/physreva.111.032404</a>'
  apa: 'Barkhausen, F., Ares Santos, L., Schumacher, S., &#38; Sperling, J. (2025).
    Entanglement between dependent degrees of freedom: Quasiparticle correlations.
    <i>Physical Review A</i>, <i>111</i>(3), Article 032404. <a href="https://doi.org/10.1103/physreva.111.032404">https://doi.org/10.1103/physreva.111.032404</a>'
  bibtex: '@article{Barkhausen_Ares Santos_Schumacher_Sperling_2025, title={Entanglement
    between dependent degrees of freedom: Quasiparticle correlations}, volume={111},
    DOI={<a href="https://doi.org/10.1103/physreva.111.032404">10.1103/physreva.111.032404</a>},
    number={3032404}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Barkhausen, Franziska and Ares Santos, Laura and Schumacher, Stefan
    and Sperling, Jan}, year={2025} }'
  chicago: 'Barkhausen, Franziska, Laura Ares Santos, Stefan Schumacher, and Jan Sperling.
    “Entanglement between Dependent Degrees of Freedom: Quasiparticle Correlations.”
    <i>Physical Review A</i> 111, no. 3 (2025). <a href="https://doi.org/10.1103/physreva.111.032404">https://doi.org/10.1103/physreva.111.032404</a>.'
  ieee: 'F. Barkhausen, L. Ares Santos, S. Schumacher, and J. Sperling, “Entanglement
    between dependent degrees of freedom: Quasiparticle correlations,” <i>Physical
    Review A</i>, vol. 111, no. 3, Art. no. 032404, 2025, doi: <a href="https://doi.org/10.1103/physreva.111.032404">10.1103/physreva.111.032404</a>.'
  mla: 'Barkhausen, Franziska, et al. “Entanglement between Dependent Degrees of Freedom:
    Quasiparticle Correlations.” <i>Physical Review A</i>, vol. 111, no. 3, 032404,
    American Physical Society (APS), 2025, doi:<a href="https://doi.org/10.1103/physreva.111.032404">10.1103/physreva.111.032404</a>.'
  short: F. Barkhausen, L. Ares Santos, S. Schumacher, J. Sperling, Physical Review
    A 111 (2025).
date_created: 2025-09-12T10:37:34Z
date_updated: 2025-09-12T10:42:16Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '706'
- _id: '35'
- _id: '230'
- _id: '623'
- _id: '429'
doi: 10.1103/physreva.111.032404
intvolume: '       111'
issue: '3'
language:
- iso: eng
project:
- _id: '53'
  name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
    zu funktionellen Strukturen'
- _id: '54'
  name: TRR 142 - Project Area A
- _id: '56'
  name: TRR 142 - Project Area C
- _id: '61'
  name: 'TRR 142; TP A04: Nichtlineare Quantenprozesstomographie und Photonik mit
    Polaritonen in Mikrokavitäten'
- _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 A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Entanglement between dependent degrees of freedom: Quasiparticle correlations'
type: journal_article
user_id: '16199'
volume: 111
year: '2025'
...
---
_id: '60992'
abstract:
- lang: eng
  text: Non-Hermitian systems hosting exceptional points (EPs) exhibit enhanced sensitivity
    and unconventional mode dynamics. Going beyond isolated EPs, here we report on
    the existence of exceptional rings (ERs) in planar optical resonators with specific
    form of circular dichroism and TE-TM splitting. Such exceptional rings possess
    intriguing topologies as discussed earlier for condensed matter systems, but they
    remain virtually unexplored in presence of nonlinearity, for which our photonic
    platform is ideal. We find that when Kerr-type nonlinearity (or saturable gain)
    is introduced, the linear ER splits into two concentric ERs, with the larger-radius
    ring being a ring of third-order EPs. Transitioning from linear to nonlinear regime,
    we present a rigorous analysis of spectral topology and report enhanced and adjustable
    perturbation response in the nonlinear regime. Whereas certain features are specific
    to our system, the results on non-Hermitian spectral topology and nonlinearity-enhanced
    perturbation response are generic and equally relevant to a broad class of other
    nonlinear non-Hermitian systems, providing a universal framework for engineering
    ERs and EPs in nonlinear non-Hermitian systems.
author:
- first_name: Jan
  full_name: Wingenbach, Jan
  id: '69187'
  last_name: Wingenbach
- first_name: 'Laura '
  full_name: 'Ares Santos, Laura '
  last_name: Ares Santos
- first_name: Xuekai
  full_name: Ma, Xuekai
  id: '59416'
  last_name: Ma
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Stefan
  full_name: Schumacher, Stefan
  id: '27271'
  last_name: Schumacher
  orcid: 0000-0003-4042-4951
citation:
  ama: Wingenbach J, Ares Santos L, Ma X, Sperling J, Schumacher S. Sensitivity and
    Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities.
    <i>Arxiv</i>. Published online 2025. doi:<a href="https://doi.org/10.48550/ARXIV.2507.07099">10.48550/ARXIV.2507.07099</a>
  apa: Wingenbach, J., Ares Santos, L., Ma, X., Sperling, J., &#38; Schumacher, S.
    (2025). Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian
    Planar Optical Microcavities. <i>Arxiv</i>. <a href="https://doi.org/10.48550/ARXIV.2507.07099">https://doi.org/10.48550/ARXIV.2507.07099</a>
  bibtex: '@article{Wingenbach_Ares Santos_Ma_Sperling_Schumacher_2025, title={Sensitivity
    and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities},
    DOI={<a href="https://doi.org/10.48550/ARXIV.2507.07099">10.48550/ARXIV.2507.07099</a>},
    journal={Arxiv}, publisher={Arxiv}, author={Wingenbach, Jan and Ares Santos, Laura  and
    Ma, Xuekai and Sperling, Jan and Schumacher, Stefan}, year={2025} }'
  chicago: Wingenbach, Jan, Laura  Ares Santos, Xuekai Ma, Jan Sperling, and Stefan
    Schumacher. “Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian
    Planar Optical Microcavities.” <i>Arxiv</i>, 2025. <a href="https://doi.org/10.48550/ARXIV.2507.07099">https://doi.org/10.48550/ARXIV.2507.07099</a>.
  ieee: 'J. Wingenbach, L. Ares Santos, X. Ma, J. Sperling, and S. Schumacher, “Sensitivity
    and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities,”
    <i>Arxiv</i>, 2025, doi: <a href="https://doi.org/10.48550/ARXIV.2507.07099">10.48550/ARXIV.2507.07099</a>.'
  mla: Wingenbach, Jan, et al. “Sensitivity and Topology of Exceptional Rings in Nonlinear
    Non-Hermitian Planar Optical Microcavities.” <i>Arxiv</i>, Arxiv, 2025, doi:<a
    href="https://doi.org/10.48550/ARXIV.2507.07099">10.48550/ARXIV.2507.07099</a>.
  short: J. Wingenbach, L. Ares Santos, X. Ma, J. Sperling, S. Schumacher, Arxiv (2025).
date_created: 2025-08-25T11:15:22Z
date_updated: 2025-12-05T13:55:48Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '706'
- _id: '705'
- _id: '35'
- _id: '230'
- _id: '429'
- _id: '27'
doi: 10.48550/ARXIV.2507.07099
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: '174'
  name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen
    Systemen: Eine theoretische Analyse'
- _id: '56'
  name: TRR 142 - Project Area C
publication: Arxiv
publisher: Arxiv
status: public
title: Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar
  Optical Microcavities
type: journal_article
user_id: '16199'
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: '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: '54093'
article_number: '052408'
article_type: original
author:
- first_name: Julien
  full_name: Pinske, Julien
  last_name: Pinske
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
citation:
  ama: Pinske J, Sperling J. Unbreakable and breakable quantum censorship. <i>Physical
    Review A</i>. 2024;109(5). doi:<a href="https://doi.org/10.1103/physreva.109.052408">10.1103/physreva.109.052408</a>
  apa: Pinske, J., &#38; Sperling, J. (2024). Unbreakable and breakable quantum censorship.
    <i>Physical Review A</i>, <i>109</i>(5), Article 052408. <a href="https://doi.org/10.1103/physreva.109.052408">https://doi.org/10.1103/physreva.109.052408</a>
  bibtex: '@article{Pinske_Sperling_2024, title={Unbreakable and breakable quantum
    censorship}, volume={109}, DOI={<a href="https://doi.org/10.1103/physreva.109.052408">10.1103/physreva.109.052408</a>},
    number={5052408}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Pinske, Julien and Sperling, Jan}, year={2024} }'
  chicago: Pinske, Julien, and Jan Sperling. “Unbreakable and Breakable Quantum Censorship.”
    <i>Physical Review A</i> 109, no. 5 (2024). <a href="https://doi.org/10.1103/physreva.109.052408">https://doi.org/10.1103/physreva.109.052408</a>.
  ieee: 'J. Pinske and J. Sperling, “Unbreakable and breakable quantum censorship,”
    <i>Physical Review A</i>, vol. 109, no. 5, Art. no. 052408, 2024, doi: <a href="https://doi.org/10.1103/physreva.109.052408">10.1103/physreva.109.052408</a>.'
  mla: Pinske, Julien, and Jan Sperling. “Unbreakable and Breakable Quantum Censorship.”
    <i>Physical Review A</i>, vol. 109, no. 5, 052408, American Physical Society (APS),
    2024, doi:<a href="https://doi.org/10.1103/physreva.109.052408">10.1103/physreva.109.052408</a>.
  short: J. Pinske, J. Sperling, Physical Review A 109 (2024).
date_created: 2024-05-08T13:31:37Z
date_updated: 2024-05-08T14:19:33Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
doi: 10.1103/physreva.109.052408
intvolume: '       109'
issue: '5'
language:
- iso: eng
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Unbreakable and breakable quantum censorship
type: journal_article
user_id: '75127'
volume: 109
year: '2024'
...
---
_id: '55140'
article_number: '012424'
author:
- first_name: Farha
  full_name: Yasmin, Farha
  last_name: Yasmin
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
citation:
  ama: 'Yasmin F, Sperling J. Entanglement-assisted quantum speedup: Beating local
    quantum speed limits. <i>Physical Review A</i>. 2024;110(1). doi:<a href="https://doi.org/10.1103/physreva.110.012424">10.1103/physreva.110.012424</a>'
  apa: 'Yasmin, F., &#38; Sperling, J. (2024). Entanglement-assisted quantum speedup:
    Beating local quantum speed limits. <i>Physical Review A</i>, <i>110</i>(1), Article
    012424. <a href="https://doi.org/10.1103/physreva.110.012424">https://doi.org/10.1103/physreva.110.012424</a>'
  bibtex: '@article{Yasmin_Sperling_2024, title={Entanglement-assisted quantum speedup:
    Beating local quantum speed limits}, volume={110}, DOI={<a href="https://doi.org/10.1103/physreva.110.012424">10.1103/physreva.110.012424</a>},
    number={1012424}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Yasmin, Farha and Sperling, Jan}, year={2024} }'
  chicago: 'Yasmin, Farha, and Jan Sperling. “Entanglement-Assisted Quantum Speedup:
    Beating Local Quantum Speed Limits.” <i>Physical Review A</i> 110, no. 1 (2024).
    <a href="https://doi.org/10.1103/physreva.110.012424">https://doi.org/10.1103/physreva.110.012424</a>.'
  ieee: 'F. Yasmin and J. Sperling, “Entanglement-assisted quantum speedup: Beating
    local quantum speed limits,” <i>Physical Review A</i>, vol. 110, no. 1, Art. no.
    012424, 2024, doi: <a href="https://doi.org/10.1103/physreva.110.012424">10.1103/physreva.110.012424</a>.'
  mla: 'Yasmin, Farha, and Jan Sperling. “Entanglement-Assisted Quantum Speedup: Beating
    Local Quantum Speed Limits.” <i>Physical Review A</i>, vol. 110, no. 1, 012424,
    American Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/physreva.110.012424">10.1103/physreva.110.012424</a>.'
  short: F. Yasmin, J. Sperling, Physical Review A 110 (2024).
date_created: 2024-07-09T10:27:33Z
date_updated: 2024-07-09T10:29:29Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
doi: 10.1103/physreva.110.012424
intvolume: '       110'
issue: '1'
language:
- iso: eng
project:
- _id: '174'
  grant_number: '231447078'
  name: 'TRR 142 - C10: TRR 142 -  Erzeugung und Charakterisierung von Quantenlicht
    in nichtlinearen Systemen: Eine theoretische Analyse (C10*)'
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Entanglement-assisted quantum speedup: Beating local quantum speed limits'
type: journal_article
user_id: '75127'
volume: 110
year: '2024'
...
---
_id: '55173'
article_number: '013705'
author:
- first_name: Christian
  full_name: Di Fidio, Christian
  last_name: Di Fidio
- first_name: Laura
  full_name: Ares, Laura
  last_name: Ares
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
citation:
  ama: Di Fidio C, Ares L, Sperling J. Quantum walks and entanglement in cavity networks.
    <i>Physical Review A</i>. 2024;110(1). doi:<a href="https://doi.org/10.1103/physreva.110.013705">10.1103/physreva.110.013705</a>
  apa: Di Fidio, C., Ares, L., &#38; Sperling, J. (2024). Quantum walks and entanglement
    in cavity networks. <i>Physical Review A</i>, <i>110</i>(1), Article 013705. <a
    href="https://doi.org/10.1103/physreva.110.013705">https://doi.org/10.1103/physreva.110.013705</a>
  bibtex: '@article{Di Fidio_Ares_Sperling_2024, title={Quantum walks and entanglement
    in cavity networks}, volume={110}, DOI={<a href="https://doi.org/10.1103/physreva.110.013705">10.1103/physreva.110.013705</a>},
    number={1013705}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Di Fidio, Christian and Ares, Laura and Sperling, Jan}, year={2024}
    }'
  chicago: Di Fidio, Christian, Laura Ares, and Jan Sperling. “Quantum Walks and Entanglement
    in Cavity Networks.” <i>Physical Review A</i> 110, no. 1 (2024). <a href="https://doi.org/10.1103/physreva.110.013705">https://doi.org/10.1103/physreva.110.013705</a>.
  ieee: 'C. Di Fidio, L. Ares, and J. Sperling, “Quantum walks and entanglement in
    cavity networks,” <i>Physical Review A</i>, vol. 110, no. 1, Art. no. 013705,
    2024, doi: <a href="https://doi.org/10.1103/physreva.110.013705">10.1103/physreva.110.013705</a>.'
  mla: Di Fidio, Christian, et al. “Quantum Walks and Entanglement in Cavity Networks.”
    <i>Physical Review A</i>, vol. 110, no. 1, 013705, American Physical Society (APS),
    2024, doi:<a href="https://doi.org/10.1103/physreva.110.013705">10.1103/physreva.110.013705</a>.
  short: C. Di Fidio, L. Ares, J. Sperling, Physical Review A 110 (2024).
date_created: 2024-07-11T07:20:08Z
date_updated: 2024-07-11T07:21:12Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
doi: 10.1103/physreva.110.013705
intvolume: '       110'
issue: '1'
language:
- iso: eng
project:
- _id: '266'
  grant_number: PROFILNRW-2020-067
  name: 'PhoQC: PhoQC: Photonisches Quantencomputing'
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Quantum walks and entanglement in cavity networks
type: journal_article
user_id: '75127'
volume: 110
year: '2024'
...
---
_id: '57743'
article_number: '023717'
author:
- first_name: Suchitra
  full_name: Krishnaswamy, Suchitra
  id: '78347'
  last_name: Krishnaswamy
- first_name: Fabian
  full_name: Schlue, Fabian
  id: '63579'
  last_name: Schlue
- first_name: L.
  full_name: Ares, L.
  last_name: Ares
- first_name: V.
  full_name: Dyachuk, V.
  last_name: Dyachuk
- first_name: Michael
  full_name: Stefszky, Michael
  id: '42777'
  last_name: Stefszky
- 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
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
citation:
  ama: Krishnaswamy S, Schlue F, Ares L, et al. Experimental retrieval of photon statistics
    from click detection. <i>Physical Review A</i>. 2024;110(2). doi:<a href="https://doi.org/10.1103/physreva.110.023717">10.1103/physreva.110.023717</a>
  apa: Krishnaswamy, S., Schlue, F., Ares, L., Dyachuk, V., Stefszky, M., Brecht,
    B., Silberhorn, C., &#38; Sperling, J. (2024). Experimental retrieval of photon
    statistics from click detection. <i>Physical Review A</i>, <i>110</i>(2), Article
    023717. <a href="https://doi.org/10.1103/physreva.110.023717">https://doi.org/10.1103/physreva.110.023717</a>
  bibtex: '@article{Krishnaswamy_Schlue_Ares_Dyachuk_Stefszky_Brecht_Silberhorn_Sperling_2024,
    title={Experimental retrieval of photon statistics from click detection}, volume={110},
    DOI={<a href="https://doi.org/10.1103/physreva.110.023717">10.1103/physreva.110.023717</a>},
    number={2023717}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Krishnaswamy, Suchitra and Schlue, Fabian and Ares, L. and Dyachuk,
    V. and Stefszky, Michael and Brecht, Benjamin and Silberhorn, Christine and Sperling,
    Jan}, year={2024} }'
  chicago: Krishnaswamy, Suchitra, Fabian Schlue, L. Ares, V. Dyachuk, Michael Stefszky,
    Benjamin Brecht, Christine Silberhorn, and Jan Sperling. “Experimental Retrieval
    of Photon Statistics from Click Detection.” <i>Physical Review A</i> 110, no.
    2 (2024). <a href="https://doi.org/10.1103/physreva.110.023717">https://doi.org/10.1103/physreva.110.023717</a>.
  ieee: 'S. Krishnaswamy <i>et al.</i>, “Experimental retrieval of photon statistics
    from click detection,” <i>Physical Review A</i>, vol. 110, no. 2, Art. no. 023717,
    2024, doi: <a href="https://doi.org/10.1103/physreva.110.023717">10.1103/physreva.110.023717</a>.'
  mla: Krishnaswamy, Suchitra, et al. “Experimental Retrieval of Photon Statistics
    from Click Detection.” <i>Physical Review A</i>, vol. 110, no. 2, 023717, American
    Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/physreva.110.023717">10.1103/physreva.110.023717</a>.
  short: S. Krishnaswamy, F. Schlue, L. Ares, V. Dyachuk, M. Stefszky, B. Brecht,
    C. Silberhorn, J. Sperling, Physical Review A 110 (2024).
date_created: 2024-12-11T15:33:08Z
date_updated: 2024-12-11T15:35:07Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
- _id: '623'
doi: 10.1103/physreva.110.023717
intvolume: '       110'
issue: '2'
language:
- iso: eng
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Experimental retrieval of photon statistics from click detection
type: journal_article
user_id: '75127'
volume: 110
year: '2024'
...
---
_id: '44050'
article_number: '042420'
author:
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Elizabeth
  full_name: Agudelo, Elizabeth
  last_name: Agudelo
citation:
  ama: 'Sperling J, Agudelo E. Entanglement of particles versus entanglement of fields:
    Independent quantum resources. <i>Physical Review A</i>. 2023;107(4). doi:<a href="https://doi.org/10.1103/physreva.107.042420">10.1103/physreva.107.042420</a>'
  apa: 'Sperling, J., &#38; Agudelo, E. (2023). Entanglement of particles versus entanglement
    of fields: Independent quantum resources. <i>Physical Review A</i>, <i>107</i>(4),
    Article 042420. <a href="https://doi.org/10.1103/physreva.107.042420">https://doi.org/10.1103/physreva.107.042420</a>'
  bibtex: '@article{Sperling_Agudelo_2023, title={Entanglement of particles versus
    entanglement of fields: Independent quantum resources}, volume={107}, DOI={<a
    href="https://doi.org/10.1103/physreva.107.042420">10.1103/physreva.107.042420</a>},
    number={4042420}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Sperling, Jan and Agudelo, Elizabeth}, year={2023} }'
  chicago: 'Sperling, Jan, and Elizabeth Agudelo. “Entanglement of Particles versus
    Entanglement of Fields: Independent Quantum Resources.” <i>Physical Review A</i>
    107, no. 4 (2023). <a href="https://doi.org/10.1103/physreva.107.042420">https://doi.org/10.1103/physreva.107.042420</a>.'
  ieee: 'J. Sperling and E. Agudelo, “Entanglement of particles versus entanglement
    of fields: Independent quantum resources,” <i>Physical Review A</i>, vol. 107,
    no. 4, Art. no. 042420, 2023, doi: <a href="https://doi.org/10.1103/physreva.107.042420">10.1103/physreva.107.042420</a>.'
  mla: 'Sperling, Jan, and Elizabeth Agudelo. “Entanglement of Particles versus Entanglement
    of Fields: Independent Quantum Resources.” <i>Physical Review A</i>, vol. 107,
    no. 4, 042420, American Physical Society (APS), 2023, doi:<a href="https://doi.org/10.1103/physreva.107.042420">10.1103/physreva.107.042420</a>.'
  short: J. Sperling, E. Agudelo, Physical Review A 107 (2023).
date_created: 2023-04-18T06:55:59Z
date_updated: 2023-04-20T15:03:33Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
- _id: '35'
doi: 10.1103/physreva.107.042420
intvolume: '       107'
issue: '4'
language:
- iso: eng
project:
- _id: '53'
  name: 'TRR 142: TRR 142'
- _id: '56'
  name: 'TRR 142 - C: TRR 142 - Project Area C'
- _id: '174'
  name: 'TRR 142 - C10: TRR 142 - Subproject C10'
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Entanglement of particles versus entanglement of fields: Independent quantum
  resources'
type: journal_article
user_id: '16199'
volume: 107
year: '2023'
...
---
_id: '40477'
article_number: '012426'
author:
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Ilaria
  full_name: Gianani, Ilaria
  last_name: Gianani
- first_name: Marco
  full_name: Barbieri, Marco
  last_name: Barbieri
- first_name: Elizabeth
  full_name: Agudelo, Elizabeth
  last_name: Agudelo
citation:
  ama: 'Sperling J, Gianani I, Barbieri M, Agudelo E. Detector entanglement: Quasidistributions
    for Bell-state measurements. <i>Physical Review A</i>. 2023;107(1). doi:<a href="https://doi.org/10.1103/physreva.107.012426">10.1103/physreva.107.012426</a>'
  apa: 'Sperling, J., Gianani, I., Barbieri, M., &#38; Agudelo, E. (2023). Detector
    entanglement: Quasidistributions for Bell-state measurements. <i>Physical Review
    A</i>, <i>107</i>(1), Article 012426. <a href="https://doi.org/10.1103/physreva.107.012426">https://doi.org/10.1103/physreva.107.012426</a>'
  bibtex: '@article{Sperling_Gianani_Barbieri_Agudelo_2023, title={Detector entanglement:
    Quasidistributions for Bell-state measurements}, volume={107}, DOI={<a href="https://doi.org/10.1103/physreva.107.012426">10.1103/physreva.107.012426</a>},
    number={1012426}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Sperling, Jan and Gianani, Ilaria and Barbieri, Marco and Agudelo,
    Elizabeth}, year={2023} }'
  chicago: 'Sperling, Jan, Ilaria Gianani, Marco Barbieri, and Elizabeth Agudelo.
    “Detector Entanglement: Quasidistributions for Bell-State Measurements.” <i>Physical
    Review A</i> 107, no. 1 (2023). <a href="https://doi.org/10.1103/physreva.107.012426">https://doi.org/10.1103/physreva.107.012426</a>.'
  ieee: 'J. Sperling, I. Gianani, M. Barbieri, and E. Agudelo, “Detector entanglement:
    Quasidistributions for Bell-state measurements,” <i>Physical Review A</i>, vol.
    107, no. 1, Art. no. 012426, 2023, doi: <a href="https://doi.org/10.1103/physreva.107.012426">10.1103/physreva.107.012426</a>.'
  mla: 'Sperling, Jan, et al. “Detector Entanglement: Quasidistributions for Bell-State
    Measurements.” <i>Physical Review A</i>, vol. 107, no. 1, 012426, American Physical
    Society (APS), 2023, doi:<a href="https://doi.org/10.1103/physreva.107.012426">10.1103/physreva.107.012426</a>.'
  short: J. Sperling, I. Gianani, M. Barbieri, E. Agudelo, Physical Review A 107 (2023).
date_created: 2023-01-27T08:43:45Z
date_updated: 2023-04-20T15:16:38Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
- _id: '35'
doi: 10.1103/physreva.107.012426
intvolume: '       107'
issue: '1'
language:
- iso: eng
project:
- _id: '53'
  name: 'TRR 142: TRR 142'
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Detector entanglement: Quasidistributions for Bell-state measurements'
type: journal_article
user_id: '16199'
volume: 107
year: '2023'
...
---
_id: '42973'
article_number: '113601'
article_type: letter_note
author:
- first_name: Carolin
  full_name: Lüders, Carolin
  last_name: Lüders
- first_name: Matthias
  full_name: Pukrop, Matthias
  id: '64535'
  last_name: Pukrop
- first_name: Franziska
  full_name: Barkhausen, Franziska
  id: '63631'
  last_name: Barkhausen
- first_name: Elena
  full_name: Rozas, Elena
  last_name: Rozas
- first_name: Christian
  full_name: Schneider, Christian
  last_name: Schneider
- first_name: Sven
  full_name: Höfling, Sven
  last_name: Höfling
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Stefan
  full_name: Schumacher, Stefan
  id: '27271'
  last_name: Schumacher
  orcid: 0000-0003-4042-4951
- first_name: Marc
  full_name: Aßmann, Marc
  last_name: Aßmann
citation:
  ama: Lüders C, Pukrop M, Barkhausen F, et al. Tracking Quantum Coherence in Polariton
    Condensates with Time-Resolved Tomography. <i>Physical Review Letters</i>. 2023;130(11).
    doi:<a href="https://doi.org/10.1103/physrevlett.130.113601">10.1103/physrevlett.130.113601</a>
  apa: Lüders, C., Pukrop, M., Barkhausen, F., Rozas, E., Schneider, C., Höfling,
    S., Sperling, J., Schumacher, S., &#38; Aßmann, M. (2023). Tracking Quantum Coherence
    in Polariton Condensates with Time-Resolved Tomography. <i>Physical Review Letters</i>,
    <i>130</i>(11), Article 113601. <a href="https://doi.org/10.1103/physrevlett.130.113601">https://doi.org/10.1103/physrevlett.130.113601</a>
  bibtex: '@article{Lüders_Pukrop_Barkhausen_Rozas_Schneider_Höfling_Sperling_Schumacher_Aßmann_2023,
    title={Tracking Quantum Coherence in Polariton Condensates with Time-Resolved
    Tomography}, volume={130}, DOI={<a href="https://doi.org/10.1103/physrevlett.130.113601">10.1103/physrevlett.130.113601</a>},
    number={11113601}, journal={Physical Review Letters}, publisher={American Physical
    Society (APS)}, author={Lüders, Carolin and Pukrop, Matthias and Barkhausen, Franziska
    and Rozas, Elena and Schneider, Christian and Höfling, Sven and Sperling, Jan
    and Schumacher, Stefan and Aßmann, Marc}, year={2023} }'
  chicago: Lüders, Carolin, Matthias Pukrop, Franziska Barkhausen, Elena Rozas, Christian
    Schneider, Sven Höfling, Jan Sperling, Stefan Schumacher, and Marc Aßmann. “Tracking
    Quantum Coherence in Polariton Condensates with Time-Resolved Tomography.” <i>Physical
    Review Letters</i> 130, no. 11 (2023). <a href="https://doi.org/10.1103/physrevlett.130.113601">https://doi.org/10.1103/physrevlett.130.113601</a>.
  ieee: 'C. Lüders <i>et al.</i>, “Tracking Quantum Coherence in Polariton Condensates
    with Time-Resolved Tomography,” <i>Physical Review Letters</i>, vol. 130, no.
    11, Art. no. 113601, 2023, doi: <a href="https://doi.org/10.1103/physrevlett.130.113601">10.1103/physrevlett.130.113601</a>.'
  mla: Lüders, Carolin, et al. “Tracking Quantum Coherence in Polariton Condensates
    with Time-Resolved Tomography.” <i>Physical Review Letters</i>, vol. 130, no.
    11, 113601, American Physical Society (APS), 2023, doi:<a href="https://doi.org/10.1103/physrevlett.130.113601">10.1103/physrevlett.130.113601</a>.
  short: C. Lüders, M. Pukrop, F. Barkhausen, E. Rozas, C. Schneider, S. Höfling,
    J. Sperling, S. Schumacher, M. Aßmann, Physical Review Letters 130 (2023).
date_created: 2023-03-14T07:50:56Z
date_updated: 2023-04-20T15:28:42Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '429'
- _id: '230'
- _id: '35'
- _id: '297'
doi: 10.1103/physrevlett.130.113601
intvolume: '       130'
issue: '11'
keyword:
- General Physics and Astronomy
language:
- iso: eng
project:
- _id: '53'
  name: 'TRR 142: TRR 142'
- _id: '56'
  name: 'TRR 142 - C: TRR 142 - Project Area C'
- _id: '174'
  name: 'TRR 142 - C10: TRR 142 - Subproject C10'
- _id: '173'
  name: 'TRR 142 - C09: TRR 142 - Subproject C09'
publication: Physical Review Letters
publication_identifier:
  issn:
  - 0031-9007
  - 1079-7114
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Tracking Quantum Coherence in Polariton Condensates with Time-Resolved Tomography
type: journal_article
user_id: '16199'
volume: 130
year: '2023'
...
---
_id: '61266'
abstract:
- lang: eng
  text: <jats:p>This review examines the use of continuous-variable spectroscopy techniques
    for investigating quantum coherence and light-matter interactions in semiconductor
    systems with ultrafast dynamics. Special emphasis is placed on multichannel homodyne
    detection as a powerful tool to measure the quantum coherence and the full density
    matrix of a polariton system. Observations, such as coherence times that exceed
    the nanosecond scale obtained by monitoring the temporal decay of quantum coherence
    in a polariton condensate, are discussed. Proof-of-concept experiments and numerical
    simulations that demonstrate the enhanced resourcefulness of the produced system
    states for modern quantum protocols are assessed. The combination of tailored
    resource quantifiers and ultrafast spectroscopy techniques that have recently
    been demonstrated paves the way for future applications of quantum information
    technologies.</jats:p>
article_number: '2997'
author:
- first_name: Carolin
  full_name: Lüders, Carolin
  last_name: Lüders
- first_name: Franziska
  full_name: Barkhausen, Franziska
  id: '63631'
  last_name: Barkhausen
- first_name: Matthias
  full_name: Pukrop, Matthias
  last_name: Pukrop
- first_name: Elena
  full_name: Rozas, Elena
  last_name: Rozas
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Stefan
  full_name: Schumacher, Stefan
  id: '27271'
  last_name: Schumacher
  orcid: 0000-0003-4042-4951
- first_name: Marc
  full_name: Aßmann, Marc
  last_name: Aßmann
citation:
  ama: Lüders C, Barkhausen F, Pukrop M, et al. Continuous-variable quantum optics
    and resource theory for ultrafast semiconductor spectroscopy [Invited]. <i>Optical
    Materials Express</i>. 2023;13(11). doi:<a href="https://doi.org/10.1364/ome.497006">10.1364/ome.497006</a>
  apa: Lüders, C., Barkhausen, F., Pukrop, M., Rozas, E., Sperling, J., Schumacher,
    S., &#38; Aßmann, M. (2023). Continuous-variable quantum optics and resource theory
    for ultrafast semiconductor spectroscopy [Invited]. <i>Optical Materials Express</i>,
    <i>13</i>(11), Article 2997. <a href="https://doi.org/10.1364/ome.497006">https://doi.org/10.1364/ome.497006</a>
  bibtex: '@article{Lüders_Barkhausen_Pukrop_Rozas_Sperling_Schumacher_Aßmann_2023,
    title={Continuous-variable quantum optics and resource theory for ultrafast semiconductor
    spectroscopy [Invited]}, volume={13}, DOI={<a href="https://doi.org/10.1364/ome.497006">10.1364/ome.497006</a>},
    number={112997}, journal={Optical Materials Express}, publisher={Optica Publishing
    Group}, author={Lüders, Carolin and Barkhausen, Franziska and Pukrop, Matthias
    and Rozas, Elena and Sperling, Jan and Schumacher, Stefan and Aßmann, Marc}, year={2023}
    }'
  chicago: Lüders, Carolin, Franziska Barkhausen, Matthias Pukrop, Elena Rozas, Jan
    Sperling, Stefan Schumacher, and Marc Aßmann. “Continuous-Variable Quantum Optics
    and Resource Theory for Ultrafast Semiconductor Spectroscopy [Invited].” <i>Optical
    Materials Express</i> 13, no. 11 (2023). <a href="https://doi.org/10.1364/ome.497006">https://doi.org/10.1364/ome.497006</a>.
  ieee: 'C. Lüders <i>et al.</i>, “Continuous-variable quantum optics and resource
    theory for ultrafast semiconductor spectroscopy [Invited],” <i>Optical Materials
    Express</i>, vol. 13, no. 11, Art. no. 2997, 2023, doi: <a href="https://doi.org/10.1364/ome.497006">10.1364/ome.497006</a>.'
  mla: Lüders, Carolin, et al. “Continuous-Variable Quantum Optics and Resource Theory
    for Ultrafast Semiconductor Spectroscopy [Invited].” <i>Optical Materials Express</i>,
    vol. 13, no. 11, 2997, Optica Publishing Group, 2023, doi:<a href="https://doi.org/10.1364/ome.497006">10.1364/ome.497006</a>.
  short: C. Lüders, F. Barkhausen, M. Pukrop, E. Rozas, J. Sperling, S. Schumacher,
    M. Aßmann, Optical Materials Express 13 (2023).
date_created: 2025-09-12T11:40:26Z
date_updated: 2025-09-12T11:41:42Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '706'
- _id: '35'
- _id: '230'
- _id: '27'
- _id: '623'
doi: 10.1364/ome.497006
intvolume: '        13'
issue: '11'
language:
- iso: eng
project:
- _id: '52'
  name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '266'
  name: 'PhoQC: Photonisches Quantencomputing'
publication: Optical Materials Express
publication_identifier:
  issn:
  - 2159-3930
publication_status: published
publisher: Optica Publishing Group
status: public
title: Continuous-variable quantum optics and resource theory for ultrafast semiconductor
  spectroscopy [Invited]
type: journal_article
user_id: '16199'
volume: 13
year: '2023'
...
---
_id: '43744'
abstract:
- lang: eng
  text: We demonstrate theoretically and experimentally complex correlations in the
    photon numbers of two-mode quantum states using measurement-induced nonlinearity.
    For this, we combine the interference of coherent states and single photons with
    photon sub-traction.
author:
- first_name: Torsten
  full_name: Meier, Torsten
  id: '344'
  last_name: Meier
  orcid: 0000-0001-8864-2072
- first_name: Jan Philipp
  full_name: Hoepker, Jan Philipp
  last_name: Hoepker
- first_name: Maximilian
  full_name: Protte, Maximilian
  id: '46170'
  last_name: Protte
- first_name: Christof
  full_name: Eigner, Christof
  id: '13244'
  last_name: Eigner
  orcid: https://orcid.org/0000-0002-5693-3083
- 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
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Tim
  full_name: Bartley, Tim
  id: '49683'
  last_name: Bartley
citation:
  ama: 'Meier T, Hoepker JP, Protte M, et al. Two-Mode Photon-Number Correlations
    Created by Measurement-Induced Nonlinearity. In: <i>Conference on Lasers and Electro-Optics:
    Applications and Technology</i>. Optica Publishing Group; 2022:JTu3A. 17. doi:<a
    href="https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17">10.1364/CLEO_AT.2022.JTu3A.17</a>'
  apa: 'Meier, T., Hoepker, J. P., Protte, M., Eigner, C., Silberhorn, C., Sharapova,
    P. R., Sperling, J., &#38; Bartley, T. (2022). Two-Mode Photon-Number Correlations
    Created by Measurement-Induced Nonlinearity. <i>Conference on Lasers and Electro-Optics:
    Applications and Technology</i>, JTu3A. 17. <a href="https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17">https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17</a>'
  bibtex: '@inproceedings{Meier_Hoepker_Protte_Eigner_Silberhorn_Sharapova_Sperling_Bartley_2022,
    title={Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity},
    DOI={<a href="https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17">10.1364/CLEO_AT.2022.JTu3A.17</a>},
    booktitle={Conference on Lasers and Electro-Optics: Applications and Technology},
    publisher={Optica Publishing Group}, author={Meier, Torsten and Hoepker, Jan Philipp
    and Protte, Maximilian and Eigner, Christof and Silberhorn, Christine and Sharapova,
    Polina R. and Sperling, Jan and Bartley, Tim}, year={2022}, pages={JTu3A. 17}
    }'
  chicago: 'Meier, Torsten, Jan Philipp Hoepker, Maximilian Protte, Christof Eigner,
    Christine Silberhorn, Polina R. Sharapova, Jan Sperling, and Tim Bartley. “Two-Mode
    Photon-Number Correlations Created by Measurement-Induced Nonlinearity.” In <i>Conference
    on Lasers and Electro-Optics: Applications and Technology</i>, JTu3A. 17. Optica
    Publishing Group, 2022. <a href="https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17">https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17</a>.'
  ieee: 'T. Meier <i>et al.</i>, “Two-Mode Photon-Number Correlations Created by Measurement-Induced
    Nonlinearity,” in <i>Conference on Lasers and Electro-Optics: Applications and
    Technology</i>, San Jose, California United States, 2022, p. JTu3A. 17, doi: <a
    href="https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17">10.1364/CLEO_AT.2022.JTu3A.17</a>.'
  mla: 'Meier, Torsten, et al. “Two-Mode Photon-Number Correlations Created by Measurement-Induced
    Nonlinearity.” <i>Conference on Lasers and Electro-Optics: Applications and Technology</i>,
    Optica Publishing Group, 2022, p. JTu3A. 17, doi:<a href="https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17">10.1364/CLEO_AT.2022.JTu3A.17</a>.'
  short: 'T. Meier, J.P. Hoepker, M. Protte, C. Eigner, C. Silberhorn, P.R. Sharapova,
    J. Sperling, T. Bartley, in: Conference on Lasers and Electro-Optics: Applications
    and Technology, Optica Publishing Group, 2022, p. JTu3A. 17.'
conference:
  end_date: 2022-05-20
  location: San Jose, California United States
  name: 'CLEO: Applications and Technology 2022'
  start_date: 2022-05-15
date_created: 2023-04-16T01:31:32Z
date_updated: 2023-04-21T11:10:06Z
department:
- _id: '293'
- _id: '35'
- _id: '15'
- _id: '170'
- _id: '230'
- _id: '35'
- _id: '482'
- _id: '706'
- _id: '288'
doi: 10.1364/CLEO_AT.2022.JTu3A.17
language:
- iso: eng
main_file_link:
- url: https://opg.optica.org/abstract.cfm?uri=CLEO_AT-2022-JTu3A.17
page: JTu3A. 17
publication: 'Conference on Lasers and Electro-Optics: Applications and Technology'
publication_identifier:
  isbn:
  - 978-1-957171-05-0
publication_status: published
publisher: Optica Publishing Group
status: public
title: Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity
type: conference
user_id: '16199'
year: '2022'
...
---
_id: '34884'
article_number: '263601'
author:
- first_name: Nidhin
  full_name: Prasannan, Nidhin
  id: '71403'
  last_name: Prasannan
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- 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: Prasannan N, Sperling J, Brecht B, Silberhorn C. Direct Measurement of Higher-Order
    Nonlinear Polarization Squeezing. <i>Physical Review Letters</i>. 2022;129(26).
    doi:<a href="https://doi.org/10.1103/physrevlett.129.263601">10.1103/physrevlett.129.263601</a>
  apa: Prasannan, N., Sperling, J., Brecht, B., &#38; Silberhorn, C. (2022). Direct
    Measurement of Higher-Order Nonlinear Polarization Squeezing. <i>Physical Review
    Letters</i>, <i>129</i>(26), Article 263601. <a href="https://doi.org/10.1103/physrevlett.129.263601">https://doi.org/10.1103/physrevlett.129.263601</a>
  bibtex: '@article{Prasannan_Sperling_Brecht_Silberhorn_2022, title={Direct Measurement
    of Higher-Order Nonlinear Polarization Squeezing}, volume={129}, DOI={<a href="https://doi.org/10.1103/physrevlett.129.263601">10.1103/physrevlett.129.263601</a>},
    number={26263601}, journal={Physical Review Letters}, publisher={American Physical
    Society (APS)}, author={Prasannan, Nidhin and Sperling, Jan and Brecht, Benjamin
    and Silberhorn, Christine}, year={2022} }'
  chicago: Prasannan, Nidhin, Jan Sperling, Benjamin Brecht, and Christine Silberhorn.
    “Direct Measurement of Higher-Order Nonlinear Polarization Squeezing.” <i>Physical
    Review Letters</i> 129, no. 26 (2022). <a href="https://doi.org/10.1103/physrevlett.129.263601">https://doi.org/10.1103/physrevlett.129.263601</a>.
  ieee: 'N. Prasannan, J. Sperling, B. Brecht, and C. Silberhorn, “Direct Measurement
    of Higher-Order Nonlinear Polarization Squeezing,” <i>Physical Review Letters</i>,
    vol. 129, no. 26, Art. no. 263601, 2022, doi: <a href="https://doi.org/10.1103/physrevlett.129.263601">10.1103/physrevlett.129.263601</a>.'
  mla: Prasannan, Nidhin, et al. “Direct Measurement of Higher-Order Nonlinear Polarization
    Squeezing.” <i>Physical Review Letters</i>, vol. 129, no. 26, 263601, American
    Physical Society (APS), 2022, doi:<a href="https://doi.org/10.1103/physrevlett.129.263601">10.1103/physrevlett.129.263601</a>.
  short: N. Prasannan, J. Sperling, B. Brecht, C. Silberhorn, Physical Review Letters
    129 (2022).
date_created: 2022-12-23T07:57:24Z
date_updated: 2023-04-20T15:15:18Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '288'
- _id: '230'
- _id: '35'
doi: 10.1103/physrevlett.129.263601
intvolume: '       129'
issue: '26'
keyword:
- General Physics and Astronomy
language:
- iso: eng
publication: Physical Review Letters
publication_identifier:
  issn:
  - 0031-9007
  - 1079-7114
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Direct Measurement of Higher-Order Nonlinear Polarization Squeezing
type: journal_article
user_id: '16199'
volume: 129
year: '2022'
...
---
_id: '30921'
abstract:
- lang: eng
  text: Quantum walks function as essential means to implement quantum simulators,
    allowing one to study complex and often directly inaccessible quantum processes
    in controllable systems. In this contribution, the notion of a driven Gaussian
    quantum walk is introduced. In contrast to typically considered quantum walks
    in optical settings, we describe the operation of the walk in terms of a nonlinear
    map rather than a unitary operation, e.g., by replacing a beam-splitter-type coin
    with a two-mode squeezer, being a process that is controlled and driven by a pump
    field. This opens previously unattainable possibilities for quantum walks that
    include nonlinear elements as core components of their operation, vastly extending
    their range of applications. A full framework for driven Gaussian quantum walks
    is developed, including methods to dynamically characterize nonlinear, quantum,
    and quantum-nonlinear effects. Moreover, driven Gaussian quantum walks are compared
    with their classically interfering and linear counterparts, which are based on
    classical coherence of light rather than quantum superpositions. In particular,
    the generation and boost of highly multimode entanglement, squeezing, and other
    quantum effects are studied over the duration of the nonlinear walk. Importantly,
    we prove the quantumness of the evolution itself, regardless of the input state.
    A scheme for an experimental realization is proposed. Furthermore, nonlinear properties
    of driven Gaussian quantum walks are explored, such as amplification that leads
    to an ever increasing number of correlated quantum particles, constituting a source
    of new walkers during the walk. Therefore, a concept for quantum walks is proposed
    that leads to—and even produces—directly accessible quantum phenomena, and that
    renders the quantum simulation of nonlinear processes possible.
article_number: '042210'
article_type: original
author:
- first_name: Philip
  full_name: Held, Philip
  id: '68236'
  last_name: Held
- first_name: Melanie
  full_name: Engelkemeier, Melanie
  last_name: Engelkemeier
- first_name: Syamsundar
  full_name: De, Syamsundar
  last_name: De
- first_name: Sonja
  full_name: Barkhofen, Sonja
  id: '48188'
  last_name: Barkhofen
- 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
citation:
  ama: Held P, Engelkemeier M, De S, Barkhofen S, Sperling J, Silberhorn C. Driven
    Gaussian quantum walks. <i>Physical Review A</i>. 2022;105(4). doi:<a href="https://doi.org/10.1103/physreva.105.042210">10.1103/physreva.105.042210</a>
  apa: Held, P., Engelkemeier, M., De, S., Barkhofen, S., Sperling, J., &#38; Silberhorn,
    C. (2022). Driven Gaussian quantum walks. <i>Physical Review A</i>, <i>105</i>(4),
    Article 042210. <a href="https://doi.org/10.1103/physreva.105.042210">https://doi.org/10.1103/physreva.105.042210</a>
  bibtex: '@article{Held_Engelkemeier_De_Barkhofen_Sperling_Silberhorn_2022, title={Driven
    Gaussian quantum walks}, volume={105}, DOI={<a href="https://doi.org/10.1103/physreva.105.042210">10.1103/physreva.105.042210</a>},
    number={4042210}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Held, Philip and Engelkemeier, Melanie and De, Syamsundar and
    Barkhofen, Sonja and Sperling, Jan and Silberhorn, Christine}, year={2022} }'
  chicago: Held, Philip, Melanie Engelkemeier, Syamsundar De, Sonja Barkhofen, Jan
    Sperling, and Christine Silberhorn. “Driven Gaussian Quantum Walks.” <i>Physical
    Review A</i> 105, no. 4 (2022). <a href="https://doi.org/10.1103/physreva.105.042210">https://doi.org/10.1103/physreva.105.042210</a>.
  ieee: 'P. Held, M. Engelkemeier, S. De, S. Barkhofen, J. Sperling, and C. Silberhorn,
    “Driven Gaussian quantum walks,” <i>Physical Review A</i>, vol. 105, no. 4, Art.
    no. 042210, 2022, doi: <a href="https://doi.org/10.1103/physreva.105.042210">10.1103/physreva.105.042210</a>.'
  mla: Held, Philip, et al. “Driven Gaussian Quantum Walks.” <i>Physical Review A</i>,
    vol. 105, no. 4, 042210, American Physical Society (APS), 2022, doi:<a href="https://doi.org/10.1103/physreva.105.042210">10.1103/physreva.105.042210</a>.
  short: P. Held, M. Engelkemeier, S. De, S. Barkhofen, J. Sperling, C. Silberhorn,
    Physical Review A 105 (2022).
date_created: 2022-04-20T06:38:07Z
date_updated: 2026-01-09T09:50:22Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
- _id: '288'
- _id: '230'
- _id: '429'
- _id: '35'
doi: 10.1103/physreva.105.042210
intvolume: '       105'
issue: '4'
language:
- iso: eng
main_file_link:
- url: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.105.042210
project:
- _id: '56'
  name: 'TRR 142 - C: TRR 142 - Project Area C'
- _id: '53'
  name: 'TRR 142: TRR 142'
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Driven Gaussian quantum walks
type: journal_article
user_id: '68236'
volume: 105
year: '2022'
...