---
_id: '63656'
article_number: '012220'
article_type: original
author:
- first_name: Laura
full_name: Ares, Laura
last_name: Ares
- first_name: Julien
full_name: Pinske, Julien
last_name: Pinske
- first_name: Benjamin
full_name: Hinrichs, Benjamin
id: '99427'
last_name: Hinrichs
orcid: 0000-0001-9074-1205
- first_name: Martin
full_name: Kolb, Martin
id: '48880'
last_name: Kolb
- first_name: Jan
full_name: Sperling, Jan
id: '75127'
last_name: Sperling
orcid: 0000-0002-5844-3205
citation:
ama: Ares L, Pinske J, Hinrichs B, Kolb M, Sperling J. Restricted Monte Carlo wave-function
method and Lindblad equation for identifying entangling open-quantum-system dynamics.
Physical Review A. 2026;113(1). doi:10.1103/hcj7-8zlg
apa: Ares, L., Pinske, J., Hinrichs, B., Kolb, M., & Sperling, J. (2026). Restricted
Monte Carlo wave-function method and Lindblad equation for identifying entangling
open-quantum-system dynamics. Physical Review A, 113(1), Article
012220. https://doi.org/10.1103/hcj7-8zlg
bibtex: '@article{Ares_Pinske_Hinrichs_Kolb_Sperling_2026, title={Restricted Monte
Carlo wave-function method and Lindblad equation for identifying entangling open-quantum-system
dynamics}, volume={113}, DOI={10.1103/hcj7-8zlg},
number={1012220}, journal={Physical Review A}, publisher={American Physical Society
(APS)}, author={Ares, Laura and Pinske, Julien and Hinrichs, Benjamin and Kolb,
Martin and Sperling, Jan}, year={2026} }'
chicago: Ares, Laura, Julien Pinske, Benjamin Hinrichs, Martin Kolb, and Jan Sperling.
“Restricted Monte Carlo Wave-Function Method and Lindblad Equation for Identifying
Entangling Open-Quantum-System Dynamics.” Physical Review A 113, no. 1
(2026). https://doi.org/10.1103/hcj7-8zlg.
ieee: 'L. Ares, J. Pinske, B. Hinrichs, M. Kolb, and J. Sperling, “Restricted Monte
Carlo wave-function method and Lindblad equation for identifying entangling open-quantum-system
dynamics,” Physical Review A, vol. 113, no. 1, Art. no. 012220, 2026, doi:
10.1103/hcj7-8zlg.'
mla: Ares, Laura, et al. “Restricted Monte Carlo Wave-Function Method and Lindblad
Equation for Identifying Entangling Open-Quantum-System Dynamics.” Physical
Review A, vol. 113, no. 1, 012220, American Physical Society (APS), 2026,
doi:10.1103/hcj7-8zlg.
short: L. Ares, J. Pinske, B. Hinrichs, M. Kolb, J. Sperling, Physical Review A
113 (2026).
date_created: 2026-01-18T18:08:18Z
date_updated: 2026-01-18T18:15:01Z
department:
- _id: '799'
doi: 10.1103/hcj7-8zlg
external_id:
arxiv:
- '2412.08735'
intvolume: ' 113'
issue: '1'
language:
- iso: eng
project:
- _id: '266'
name: 'PhoQC: Photonisches Quantencomputing'
- _id: '174'
name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen
Systemen: Eine theoretische Analyse'
publication: Physical Review A
publication_identifier:
issn:
- 2469-9926
- 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Restricted Monte Carlo wave-function method and Lindblad equation for identifying
entangling open-quantum-system dynamics
type: journal_article
user_id: '99427'
volume: 113
year: '2026'
...
---
_id: '63657'
article_number: L010403
article_type: letter_note
author:
- first_name: Julien
full_name: Pinske, Julien
last_name: Pinske
- first_name: Laura
full_name: Ares, Laura
last_name: Ares
- first_name: Benjamin
full_name: Hinrichs, Benjamin
id: '99427'
last_name: Hinrichs
orcid: 0000-0001-9074-1205
- first_name: Martin
full_name: Kolb, Martin
id: '48880'
last_name: Kolb
- first_name: Jan
full_name: Sperling, Jan
id: '75127'
last_name: Sperling
orcid: 0000-0002-5844-3205
citation:
ama: Pinske J, Ares L, Hinrichs B, Kolb M, Sperling J. Separability Lindblad equation for
dynamical open-system entanglement. Physical Review A. 2026;113(1). doi:10.1103/kd3b-bfxq
apa: Pinske, J., Ares, L., Hinrichs, B., Kolb, M., & Sperling, J. (2026). Separability
Lindblad equation for dynamical open-system entanglement. Physical Review A,
113(1), Article L010403. https://doi.org/10.1103/kd3b-bfxq
bibtex: '@article{Pinske_Ares_Hinrichs_Kolb_Sperling_2026, title={Separability Lindblad
equation for dynamical open-system entanglement}, volume={113}, DOI={10.1103/kd3b-bfxq},
number={1L010403}, journal={Physical Review A}, publisher={American Physical Society
(APS)}, author={Pinske, Julien and Ares, Laura and Hinrichs, Benjamin and Kolb,
Martin and Sperling, Jan}, year={2026} }'
chicago: Pinske, Julien, Laura Ares, Benjamin Hinrichs, Martin Kolb, and Jan Sperling.
“Separability Lindblad Equation for Dynamical Open-System Entanglement.” Physical
Review A 113, no. 1 (2026). https://doi.org/10.1103/kd3b-bfxq.
ieee: 'J. Pinske, L. Ares, B. Hinrichs, M. Kolb, and J. Sperling, “Separability
Lindblad equation for dynamical open-system entanglement,” Physical Review
A, vol. 113, no. 1, Art. no. L010403, 2026, doi: 10.1103/kd3b-bfxq.'
mla: Pinske, Julien, et al. “Separability Lindblad Equation for Dynamical Open-System
Entanglement.” Physical Review A, vol. 113, no. 1, L010403, American Physical
Society (APS), 2026, doi:10.1103/kd3b-bfxq.
short: J. Pinske, L. Ares, B. Hinrichs, M. Kolb, J. Sperling, Physical Review A
113 (2026).
date_created: 2026-01-18T18:11:27Z
date_updated: 2026-01-18T18:15:26Z
department:
- _id: '799'
doi: 10.1103/kd3b-bfxq
external_id:
arxiv:
- '2412.08724'
intvolume: ' 113'
issue: '1'
language:
- iso: eng
project:
- _id: '266'
name: 'PhoQC: Photonisches Quantencomputing'
- _id: '174'
name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen
Systemen: Eine theoretische Analyse'
publication: Physical Review A
publication_identifier:
issn:
- 2469-9926
- 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Separability Lindblad equation for dynamical open-system entanglement
type: journal_article
user_id: '99427'
volume: 113
year: '2026'
...
---
_id: '58544'
abstract:
- lang: eng
text: '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 being 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. '
author:
- first_name: Denis
full_name: Kopylov, Denis
id: '98502'
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
full_name: Sharapova, Polina
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 D, Offen C, Ares L, et al. Multiphoton, multimode state classification
for nonlinear optical circuits .
apa: Kopylov, D., Offen, C., Ares, L., Wembe Moafo, B. E., Ober-Blöbaum, S., Meier,
T., Sharapova, P., & Sperling, J. (n.d.). Multiphoton, multimode state
classification for nonlinear optical circuits .
bibtex: '@article{Kopylov_Offen_Ares_Wembe Moafo_Ober-Blöbaum_Meier_Sharapova_Sperling,
title={Multiphoton, multimode state classification for nonlinear optical circuits
}, author={Kopylov, Denis and Offen, Christian and Ares, Laura and Wembe Moafo,
Boris Edgar and Ober-Blöbaum, Sina and Meier, Torsten and Sharapova, Polina and
Sperling, Jan} }'
chicago: Kopylov, Denis, Christian Offen, Laura Ares, Boris Edgar Wembe Moafo, Sina
Ober-Blöbaum, Torsten Meier, Polina Sharapova, and Jan Sperling. “Multiphoton,
Multimode State Classification for Nonlinear Optical Circuits ,” n.d.
ieee: D. Kopylov et al., “Multiphoton, multimode state classification for
nonlinear optical circuits .” .
mla: Kopylov, Denis, et al. Multiphoton, Multimode State Classification for Nonlinear
Optical Circuits .
short: D. Kopylov, C. Offen, L. Ares, B.E. Wembe Moafo, S. Ober-Blöbaum, T. Meier,
P. Sharapova, J. Sperling, (n.d.).
date_created: 2025-02-10T08:26:45Z
date_updated: 2025-02-10T08:36:12Z
department:
- _id: '623'
- _id: '15'
- _id: '636'
external_id:
arxiv:
- '2502.05123'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2502.05123
oa: '1'
publication_status: submitted
status: public
title: 'Multiphoton, multimode state classification for nonlinear optical circuits '
type: preprint
user_id: '85279'
year: '2025'
...
---
_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. Physical Review A.
2025;111(3). doi:10.1103/physreva.111.032404'
apa: 'Barkhausen, F., Ares Santos, L., Schumacher, S., & Sperling, J. (2025).
Entanglement between dependent degrees of freedom: Quasiparticle correlations.
Physical Review A, 111(3), Article 032404. https://doi.org/10.1103/physreva.111.032404'
bibtex: '@article{Barkhausen_Ares Santos_Schumacher_Sperling_2025, title={Entanglement
between dependent degrees of freedom: Quasiparticle correlations}, volume={111},
DOI={10.1103/physreva.111.032404},
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.”
Physical Review A 111, no. 3 (2025). https://doi.org/10.1103/physreva.111.032404.'
ieee: 'F. Barkhausen, L. Ares Santos, S. Schumacher, and J. Sperling, “Entanglement
between dependent degrees of freedom: Quasiparticle correlations,” Physical
Review A, vol. 111, no. 3, Art. no. 032404, 2025, doi: 10.1103/physreva.111.032404.'
mla: 'Barkhausen, Franziska, et al. “Entanglement between Dependent Degrees of Freedom:
Quasiparticle Correlations.” Physical Review A, vol. 111, no. 3, 032404,
American Physical Society (APS), 2025, doi:10.1103/physreva.111.032404.'
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.
Arxiv. Published online 2025. doi:10.48550/ARXIV.2507.07099
apa: Wingenbach, J., Ares Santos, L., Ma, X., Sperling, J., & Schumacher, S.
(2025). Sensitivity and Topology of Exceptional Rings in Nonlinear Non-Hermitian
Planar Optical Microcavities. Arxiv. https://doi.org/10.48550/ARXIV.2507.07099
bibtex: '@article{Wingenbach_Ares Santos_Ma_Sperling_Schumacher_2025, title={Sensitivity
and Topology of Exceptional Rings in Nonlinear Non-Hermitian Planar Optical Microcavities},
DOI={10.48550/ARXIV.2507.07099},
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.” Arxiv, 2025. https://doi.org/10.48550/ARXIV.2507.07099.
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,”
Arxiv, 2025, doi: 10.48550/ARXIV.2507.07099.'
mla: Wingenbach, Jan, et al. “Sensitivity and Topology of Exceptional Rings in Nonlinear
Non-Hermitian Planar Optical Microcavities.” Arxiv, Arxiv, 2025, doi:10.48550/ARXIV.2507.07099.
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: 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.
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. Physical Review Research. 2025;7(3). doi:10.1103/sv6z-v1gk
apa: Kopylov, D. A., Offen, C., Ares, L., Wembe Moafo, B. E., Ober-Blöbaum, S.,
Meier, T., Sharapova, P. R., & Sperling, J. (2025). Multiphoton, multimode
state classification for nonlinear optical circuits. Physical Review Research,
7(3), Article 033062. https://doi.org/10.1103/sv6z-v1gk
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={10.1103/sv6z-v1gk},
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.” Physical Review
Research 7, no. 3 (2025). https://doi.org/10.1103/sv6z-v1gk.
ieee: 'D. A. Kopylov et al., “Multiphoton, multimode state classification
for nonlinear optical circuits,” Physical Review Research, vol. 7, no.
3, Art. no. 033062, 2025, doi: 10.1103/sv6z-v1gk.'
mla: Kopylov, Denis A., et al. “Multiphoton, Multimode State Classification for
Nonlinear Optical Circuits.” Physical Review Research, vol. 7, no. 3, 033062,
American Physical Society (APS), 2025, doi:10.1103/sv6z-v1gk.
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: '62979'
abstract:
- lang: eng
text: 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 being 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.
author:
- 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
- first_name: Sina
full_name: Ober-Blöbaum, Sina
id: '16494'
last_name: Ober-Blöbaum
- first_name: Boris Edgar
full_name: Wembe Moafo, Boris Edgar
id: '95394'
last_name: Wembe Moafo
- first_name: Christian
full_name: Offen, Christian
id: '85279'
last_name: Offen
orcid: 0000-0002-5940-8057
citation:
ama: Meier T, Sharapova PR, Sperling J, Ober-Blöbaum S, Wembe Moafo BE, Offen C.
Multiphoton, multimode state classification for nonlinear optical circuits. Published
online 2025.
apa: Meier, T., Sharapova, P. R., Sperling, J., Ober-Blöbaum, S., Wembe Moafo, B.
E., & Offen, C. (2025). Multiphoton, multimode state classification for
nonlinear optical circuits.
bibtex: '@article{Meier_Sharapova_Sperling_Ober-Blöbaum_Wembe Moafo_Offen_2025,
title={Multiphoton, multimode state classification for nonlinear optical circuits},
author={Meier, Torsten and Sharapova, Polina R. and Sperling, Jan and Ober-Blöbaum,
Sina and Wembe Moafo, Boris Edgar and Offen, Christian}, year={2025} }'
chicago: Meier, Torsten, Polina R. Sharapova, Jan Sperling, Sina Ober-Blöbaum, Boris
Edgar Wembe Moafo, and Christian Offen. “Multiphoton, Multimode State Classification
for Nonlinear Optical Circuits,” 2025.
ieee: T. Meier, P. R. Sharapova, J. Sperling, S. Ober-Blöbaum, B. E. Wembe Moafo,
and C. Offen, “Multiphoton, multimode state classification for nonlinear optical
circuits.” 2025.
mla: Meier, Torsten, et al. Multiphoton, Multimode State Classification for Nonlinear
Optical Circuits. 2025.
short: T. Meier, P.R. Sharapova, J. Sperling, S. Ober-Blöbaum, B.E. Wembe Moafo,
C. Offen, (2025).
date_created: 2025-12-09T08:59:27Z
date_updated: 2025-12-09T09:10:23Z
department:
- _id: '15'
- _id: '170'
- _id: '293'
- _id: '706'
- _id: '636'
- _id: '230'
- _id: '623'
- _id: '429'
- _id: '35'
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'
status: public
title: Multiphoton, multimode state classification for nonlinear optical circuits
type: preprint
user_id: '16199'
year: '2025'
...
---
_id: '63021'
abstract:
- lang: eng
text: 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.
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. Physical Review Research.
2025;7(2). doi:10.1103/physrevresearch.7.023038
apa: Bianchi, L., Marconi, C., Sperling, J., & Bacco, D. (2025). Predetection
squeezing as a resource for high-dimensional Bell-state measurements. Physical
Review Research, 7(2), Article 023038. https://doi.org/10.1103/physrevresearch.7.023038
bibtex: '@article{Bianchi_Marconi_Sperling_Bacco_2025, title={Predetection squeezing
as a resource for high-dimensional Bell-state measurements}, volume={7}, DOI={10.1103/physrevresearch.7.023038},
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.” Physical
Review Research 7, no. 2 (2025). https://doi.org/10.1103/physrevresearch.7.023038.
ieee: 'L. Bianchi, C. Marconi, J. Sperling, and D. Bacco, “Predetection squeezing
as a resource for high-dimensional Bell-state measurements,” Physical Review
Research, vol. 7, no. 2, Art. no. 023038, 2025, doi: 10.1103/physrevresearch.7.023038.'
mla: Bianchi, Luca, et al. “Predetection Squeezing as a Resource for High-Dimensional
Bell-State Measurements.” Physical Review Research, vol. 7, no. 2, 023038,
American Physical Society (APS), 2025, doi:10.1103/physrevresearch.7.023038.
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: 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.
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.
Physical Review Research. 2025;7(4). doi:10.1103/8hy1-m5gg
apa: Bianchi, L., Marconi, C., Ares, L., Bacco, D., & Sperling, J. (2025). Unified
boson sampling. Physical Review Research, 7(4), Article L042068.
https://doi.org/10.1103/8hy1-m5gg
bibtex: '@article{Bianchi_Marconi_Ares_Bacco_Sperling_2025, title={Unified boson
sampling}, volume={7}, DOI={10.1103/8hy1-m5gg},
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.” Physical Review Research 7, no. 4 (2025). https://doi.org/10.1103/8hy1-m5gg.
ieee: 'L. Bianchi, C. Marconi, L. Ares, D. Bacco, and J. Sperling, “Unified boson
sampling,” Physical Review Research, vol. 7, no. 4, Art. no. L042068, 2025,
doi: 10.1103/8hy1-m5gg.'
mla: Bianchi, Luca, et al. “Unified Boson Sampling.” Physical Review Research,
vol. 7, no. 4, L042068, American Physical Society (APS), 2025, doi:10.1103/8hy1-m5gg.
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. Physical
Review A. 2024;109(5). doi:10.1103/physreva.109.052408
apa: Pinske, J., & Sperling, J. (2024). Unbreakable and breakable quantum censorship.
Physical Review A, 109(5), Article 052408. https://doi.org/10.1103/physreva.109.052408
bibtex: '@article{Pinske_Sperling_2024, title={Unbreakable and breakable quantum
censorship}, volume={109}, DOI={10.1103/physreva.109.052408},
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.”
Physical Review A 109, no. 5 (2024). https://doi.org/10.1103/physreva.109.052408.
ieee: 'J. Pinske and J. Sperling, “Unbreakable and breakable quantum censorship,”
Physical Review A, vol. 109, no. 5, Art. no. 052408, 2024, doi: 10.1103/physreva.109.052408.'
mla: Pinske, Julien, and Jan Sperling. “Unbreakable and Breakable Quantum Censorship.”
Physical Review A, vol. 109, no. 5, 052408, American Physical Society (APS),
2024, doi:10.1103/physreva.109.052408.
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: '54812'
article_number: '240802'
author:
- first_name: Lisa T.
full_name: Weinbrenner, Lisa T.
last_name: Weinbrenner
- first_name: Nidhin
full_name: Prasannan, Nidhin
id: '71403'
last_name: Prasannan
- first_name: Kiara
full_name: Hansenne, Kiara
last_name: Hansenne
- first_name: Sophia
full_name: Denker, Sophia
last_name: Denker
- 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
- first_name: Otfried
full_name: Gühne, Otfried
last_name: Gühne
citation:
ama: 'Weinbrenner LT, Prasannan N, Hansenne K, et al. Certifying the Topology of
Quantum Networks: Theory and Experiment. Physical Review Letters. 2024;132(24).
doi:10.1103/physrevlett.132.240802'
apa: 'Weinbrenner, L. T., Prasannan, N., Hansenne, K., Denker, S., Sperling, J.,
Brecht, B., Silberhorn, C., & Gühne, O. (2024). Certifying the Topology of
Quantum Networks: Theory and Experiment. Physical Review Letters, 132(24),
Article 240802. https://doi.org/10.1103/physrevlett.132.240802'
bibtex: '@article{Weinbrenner_Prasannan_Hansenne_Denker_Sperling_Brecht_Silberhorn_Gühne_2024,
title={Certifying the Topology of Quantum Networks: Theory and Experiment}, volume={132},
DOI={10.1103/physrevlett.132.240802},
number={24240802}, journal={Physical Review Letters}, publisher={American Physical
Society (APS)}, author={Weinbrenner, Lisa T. and Prasannan, Nidhin and Hansenne,
Kiara and Denker, Sophia and Sperling, Jan and Brecht, Benjamin and Silberhorn,
Christine and Gühne, Otfried}, year={2024} }'
chicago: 'Weinbrenner, Lisa T., Nidhin Prasannan, Kiara Hansenne, Sophia Denker,
Jan Sperling, Benjamin Brecht, Christine Silberhorn, and Otfried Gühne. “Certifying
the Topology of Quantum Networks: Theory and Experiment.” Physical Review Letters
132, no. 24 (2024). https://doi.org/10.1103/physrevlett.132.240802.'
ieee: 'L. T. Weinbrenner et al., “Certifying the Topology of Quantum Networks:
Theory and Experiment,” Physical Review Letters, vol. 132, no. 24, Art.
no. 240802, 2024, doi: 10.1103/physrevlett.132.240802.'
mla: 'Weinbrenner, Lisa T., et al. “Certifying the Topology of Quantum Networks:
Theory and Experiment.” Physical Review Letters, vol. 132, no. 24, 240802,
American Physical Society (APS), 2024, doi:10.1103/physrevlett.132.240802.'
short: L.T. Weinbrenner, N. Prasannan, K. Hansenne, S. Denker, J. Sperling, B. Brecht,
C. Silberhorn, O. Gühne, Physical Review Letters 132 (2024).
date_created: 2024-06-19T06:36:54Z
date_updated: 2024-06-19T06:59:45Z
department:
- _id: '15'
- _id: '623'
- _id: '288'
doi: 10.1103/physrevlett.132.240802
intvolume: ' 132'
issue: '24'
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: 'Certifying the Topology of Quantum Networks: Theory and Experiment'
type: journal_article
user_id: '27150'
volume: 132
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. Physical Review A. 2024;110(1). doi:10.1103/physreva.110.012424'
apa: 'Yasmin, F., & Sperling, J. (2024). Entanglement-assisted quantum speedup:
Beating local quantum speed limits. Physical Review A, 110(1), Article
012424. https://doi.org/10.1103/physreva.110.012424'
bibtex: '@article{Yasmin_Sperling_2024, title={Entanglement-assisted quantum speedup:
Beating local quantum speed limits}, volume={110}, DOI={10.1103/physreva.110.012424},
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.” Physical Review A 110, no. 1 (2024).
https://doi.org/10.1103/physreva.110.012424.'
ieee: 'F. Yasmin and J. Sperling, “Entanglement-assisted quantum speedup: Beating
local quantum speed limits,” Physical Review A, vol. 110, no. 1, Art. no.
012424, 2024, doi: 10.1103/physreva.110.012424.'
mla: 'Yasmin, Farha, and Jan Sperling. “Entanglement-Assisted Quantum Speedup: Beating
Local Quantum Speed Limits.” Physical Review A, vol. 110, no. 1, 012424,
American Physical Society (APS), 2024, doi:10.1103/physreva.110.012424.'
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.
Physical Review A. 2024;110(1). doi:10.1103/physreva.110.013705
apa: Di Fidio, C., Ares, L., & Sperling, J. (2024). Quantum walks and entanglement
in cavity networks. Physical Review A, 110(1), Article 013705. https://doi.org/10.1103/physreva.110.013705
bibtex: '@article{Di Fidio_Ares_Sperling_2024, title={Quantum walks and entanglement
in cavity networks}, volume={110}, DOI={10.1103/physreva.110.013705},
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.” Physical Review A 110, no. 1 (2024). https://doi.org/10.1103/physreva.110.013705.
ieee: 'C. Di Fidio, L. Ares, and J. Sperling, “Quantum walks and entanglement in
cavity networks,” Physical Review A, vol. 110, no. 1, Art. no. 013705,
2024, doi: 10.1103/physreva.110.013705.'
mla: Di Fidio, Christian, et al. “Quantum Walks and Entanglement in Cavity Networks.”
Physical Review A, vol. 110, no. 1, 013705, American Physical Society (APS),
2024, doi:10.1103/physreva.110.013705.
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: '55737'
abstract:
- lang: eng
text: "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.\r\n \r\n \r\n
\ \r\n \r\n
\ Published by the American Physical Society\r\n
\ 2024\r\n \r\n
\ \r\n "
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. Physical Review Research. 2024;6(3). doi:10.1103/physrevresearch.6.033194
apa: Barkhofen, S., De, S., Sperling, J., Silberhorn, C., Altland, A., Bagrets,
D., Kim, K. W., & Micklitz, T. (2024). Experimental observation of topological
quantum criticality. Physical Review Research, 6(3), Article 033194.
https://doi.org/10.1103/physrevresearch.6.033194
bibtex: '@article{Barkhofen_De_Sperling_Silberhorn_Altland_Bagrets_Kim_Micklitz_2024,
title={Experimental observation of topological quantum criticality}, volume={6},
DOI={10.1103/physrevresearch.6.033194},
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.” Physical Review Research 6, no. 3
(2024). https://doi.org/10.1103/physrevresearch.6.033194.
ieee: 'S. Barkhofen et al., “Experimental observation of topological quantum
criticality,” Physical Review Research, vol. 6, no. 3, Art. no. 033194,
2024, doi: 10.1103/physrevresearch.6.033194.'
mla: Barkhofen, Sonja, et al. “Experimental Observation of Topological Quantum Criticality.”
Physical Review Research, vol. 6, no. 3, 033194, American Physical Society
(APS), 2024, doi:10.1103/physrevresearch.6.033194.
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: '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. Physical Review A. 2024;110(2). doi:10.1103/physreva.110.023717
apa: Krishnaswamy, S., Schlue, F., Ares, L., Dyachuk, V., Stefszky, M., Brecht,
B., Silberhorn, C., & Sperling, J. (2024). Experimental retrieval of photon
statistics from click detection. Physical Review A, 110(2), Article
023717. https://doi.org/10.1103/physreva.110.023717
bibtex: '@article{Krishnaswamy_Schlue_Ares_Dyachuk_Stefszky_Brecht_Silberhorn_Sperling_2024,
title={Experimental retrieval of photon statistics from click detection}, volume={110},
DOI={10.1103/physreva.110.023717},
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.” Physical Review A 110, no.
2 (2024). https://doi.org/10.1103/physreva.110.023717.
ieee: 'S. Krishnaswamy et al., “Experimental retrieval of photon statistics
from click detection,” Physical Review A, vol. 110, no. 2, Art. no. 023717,
2024, doi: 10.1103/physreva.110.023717.'
mla: Krishnaswamy, Suchitra, et al. “Experimental Retrieval of Photon Statistics
from Click Detection.” Physical Review A, vol. 110, no. 2, 023717, American
Physical Society (APS), 2024, doi:10.1103/physreva.110.023717.
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: '54288'
abstract:
- lang: eng
text: "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.\r\n \r\n
\ \r\n \r\n \r\n
\ Published by the American Physical Society\r\n
\ 2024\r\n \r\n
\ \r\n "
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. Physical Review
Research. 2024;6(2). doi:10.1103/physrevresearch.6.l022040
apa: De, S., Ansari, V., Sperling, J., Barkhofen, S., Brecht, B., & Silberhorn,
C. (2024). Realization of high-fidelity unitary operations on up to 64 frequency
bins. Physical Review Research, 6(2), Article L022040. https://doi.org/10.1103/physrevresearch.6.l022040
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={10.1103/physrevresearch.6.l022040},
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.” Physical Review Research 6, no. 2 (2024). https://doi.org/10.1103/physrevresearch.6.l022040.
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,”
Physical Review Research, vol. 6, no. 2, Art. no. L022040, 2024, doi: 10.1103/physrevresearch.6.l022040.'
mla: De, Syamsundar, et al. “Realization of High-Fidelity Unitary Operations on
up to 64 Frequency Bins.” Physical Review Research, vol. 6, no. 2, L022040,
American Physical Society (APS), 2024, doi:10.1103/physrevresearch.6.l022040.
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: '50840'
abstract:
- lang: eng
text: Superconducting nanowire single-photon detectors (SNSPDs) have been
widely used to study the discrete nature of quantum states of light in the form
of photon-counting experiments. We show that SNSPDs can also be used to study
continuous variables of optical quantum states by performing homodyne detection
at a bandwidth of 400 kHz. By measuring the interference of a continuous-wave
field of a local oscillator with the field of the vacuum state using two SNSPDs,
we show that the variance of the difference in count rates is linearly proportional
to the photon flux of the local oscillator over almost five orders of magnitude.
The resulting shot-noise clearance of (46.0 ± 1.1) dB is the highest reported
clearance for a balanced optical homodyne detector, demonstrating their potential
for measuring highly squeezed states in the continuous-wave regime. In addition,
we measured a CMRR = 22.4 dB. From the joint click counting statistics, we also
measure the phase-dependent quadrature of a weak coherent state to demonstrate
our device’s functionality as a homodyne detector.
article_number: '1'
author:
- first_name: Maximilian
full_name: Protte, Maximilian
id: '46170'
last_name: Protte
- first_name: Timon
full_name: Schapeler, Timon
id: '55629'
last_name: Schapeler
orcid: 0000-0001-7652-1716
- 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: Protte M, Schapeler T, Sperling J, Bartley T. Low-noise balanced homodyne detection
with superconducting nanowire single-photon detectors. Optica Quantum.
2024;2(1). doi:10.1364/opticaq.502201
apa: Protte, M., Schapeler, T., Sperling, J., & Bartley, T. (2024). Low-noise
balanced homodyne detection with superconducting nanowire single-photon detectors.
Optica Quantum, 2(1), Article 1. https://doi.org/10.1364/opticaq.502201
bibtex: '@article{Protte_Schapeler_Sperling_Bartley_2024, title={Low-noise balanced
homodyne detection with superconducting nanowire single-photon detectors}, volume={2},
DOI={10.1364/opticaq.502201},
number={11}, journal={Optica Quantum}, publisher={Optica Publishing Group}, author={Protte,
Maximilian and Schapeler, Timon and Sperling, Jan and Bartley, Tim}, year={2024}
}'
chicago: Protte, Maximilian, Timon Schapeler, Jan Sperling, and Tim Bartley. “Low-Noise
Balanced Homodyne Detection with Superconducting Nanowire Single-Photon Detectors.”
Optica Quantum 2, no. 1 (2024). https://doi.org/10.1364/opticaq.502201.
ieee: 'M. Protte, T. Schapeler, J. Sperling, and T. Bartley, “Low-noise balanced
homodyne detection with superconducting nanowire single-photon detectors,” Optica
Quantum, vol. 2, no. 1, Art. no. 1, 2024, doi: 10.1364/opticaq.502201.'
mla: Protte, Maximilian, et al. “Low-Noise Balanced Homodyne Detection with Superconducting
Nanowire Single-Photon Detectors.” Optica Quantum, vol. 2, no. 1, 1, Optica
Publishing Group, 2024, doi:10.1364/opticaq.502201.
short: M. Protte, T. Schapeler, J. Sperling, T. Bartley, Optica Quantum 2 (2024).
date_created: 2024-01-25T11:48:02Z
date_updated: 2025-12-18T17:06:27Z
department:
- _id: '15'
- _id: '623'
doi: 10.1364/opticaq.502201
intvolume: ' 2'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
project:
- _id: '191'
name: 'PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform'
- _id: '239'
name: 'ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors
in Low-Light Applications'
- _id: '209'
name: 'ISOQC: Quantenkommunikation mit integrierter Optik im Zusammenhang mit supraleitender
Elektronik'
publication: Optica Quantum
publication_identifier:
issn:
- 2837-6714
publication_status: published
publisher: Optica Publishing Group
status: public
title: Low-noise balanced homodyne detection with superconducting nanowire single-photon
detectors
type: journal_article
user_id: '55629'
volume: 2
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. Physical Review A. 2023;107(4). doi:10.1103/physreva.107.042420'
apa: 'Sperling, J., & Agudelo, E. (2023). Entanglement of particles versus entanglement
of fields: Independent quantum resources. Physical Review A, 107(4),
Article 042420. https://doi.org/10.1103/physreva.107.042420'
bibtex: '@article{Sperling_Agudelo_2023, title={Entanglement of particles versus
entanglement of fields: Independent quantum resources}, volume={107}, DOI={10.1103/physreva.107.042420},
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.” Physical Review A
107, no. 4 (2023). https://doi.org/10.1103/physreva.107.042420.'
ieee: 'J. Sperling and E. Agudelo, “Entanglement of particles versus entanglement
of fields: Independent quantum resources,” Physical Review A, vol. 107,
no. 4, Art. no. 042420, 2023, doi: 10.1103/physreva.107.042420.'
mla: 'Sperling, Jan, and Elizabeth Agudelo. “Entanglement of Particles versus Entanglement
of Fields: Independent Quantum Resources.” Physical Review A, vol. 107,
no. 4, 042420, American Physical Society (APS), 2023, doi:10.1103/physreva.107.042420.'
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. Physical Review A. 2023;107(1). doi:10.1103/physreva.107.012426'
apa: 'Sperling, J., Gianani, I., Barbieri, M., & Agudelo, E. (2023). Detector
entanglement: Quasidistributions for Bell-state measurements. Physical Review
A, 107(1), Article 012426. https://doi.org/10.1103/physreva.107.012426'
bibtex: '@article{Sperling_Gianani_Barbieri_Agudelo_2023, title={Detector entanglement:
Quasidistributions for Bell-state measurements}, volume={107}, DOI={10.1103/physreva.107.012426},
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.” Physical
Review A 107, no. 1 (2023). https://doi.org/10.1103/physreva.107.012426.'
ieee: 'J. Sperling, I. Gianani, M. Barbieri, and E. Agudelo, “Detector entanglement:
Quasidistributions for Bell-state measurements,” Physical Review A, vol.
107, no. 1, Art. no. 012426, 2023, doi: 10.1103/physreva.107.012426.'
mla: 'Sperling, Jan, et al. “Detector Entanglement: Quasidistributions for Bell-State
Measurements.” Physical Review A, vol. 107, no. 1, 012426, American Physical
Society (APS), 2023, doi:10.1103/physreva.107.012426.'
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. Physical Review Letters. 2023;130(11).
doi:10.1103/physrevlett.130.113601
apa: Lüders, C., Pukrop, M., Barkhausen, F., Rozas, E., Schneider, C., Höfling,
S., Sperling, J., Schumacher, S., & Aßmann, M. (2023). Tracking Quantum Coherence
in Polariton Condensates with Time-Resolved Tomography. Physical Review Letters,
130(11), Article 113601. https://doi.org/10.1103/physrevlett.130.113601
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={10.1103/physrevlett.130.113601},
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.” Physical
Review Letters 130, no. 11 (2023). https://doi.org/10.1103/physrevlett.130.113601.
ieee: 'C. Lüders et al., “Tracking Quantum Coherence in Polariton Condensates
with Time-Resolved Tomography,” Physical Review Letters, vol. 130, no.
11, Art. no. 113601, 2023, doi: 10.1103/physrevlett.130.113601.'
mla: Lüders, Carolin, et al. “Tracking Quantum Coherence in Polariton Condensates
with Time-Resolved Tomography.” Physical Review Letters, vol. 130, no.
11, 113601, American Physical Society (APS), 2023, doi:10.1103/physrevlett.130.113601.
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'
...