---
_id: '66414'
author:
- first_name: Lorenzo Manuel
full_name: Procopio Peña, Lorenzo Manuel
id: '105816'
last_name: Procopio Peña
- first_name: Raul
full_name: Aguero-Santacruz, Raul
last_name: Aguero-Santacruz
- first_name: David
full_name: Bermudez, David
last_name: Bermudez
- first_name: Ulf
full_name: Leonhardt, Ulf
last_name: Leonhardt
citation:
ama: Procopio Peña LM, Aguero-Santacruz R, Bermudez D, Leonhardt U. Backreaction
of stimulated Hawking radiation in an optical analogue. Nature. 2026;655(8122):336-341.
doi:10.1038/s41586-026-10720-3
apa: Procopio Peña, L. M., Aguero-Santacruz, R., Bermudez, D., & Leonhardt,
U. (2026). Backreaction of stimulated Hawking radiation in an optical analogue.
Nature, 655(8122), 336–341. https://doi.org/10.1038/s41586-026-10720-3
bibtex: '@article{Procopio Peña_Aguero-Santacruz_Bermudez_Leonhardt_2026, title={Backreaction
of stimulated Hawking radiation in an optical analogue}, volume={655}, DOI={10.1038/s41586-026-10720-3},
number={8122}, journal={Nature}, publisher={Springer Science and Business Media
LLC}, author={Procopio Peña, Lorenzo Manuel and Aguero-Santacruz, Raul and Bermudez,
David and Leonhardt, Ulf}, year={2026}, pages={336–341} }'
chicago: 'Procopio Peña, Lorenzo Manuel, Raul Aguero-Santacruz, David Bermudez,
and Ulf Leonhardt. “Backreaction of Stimulated Hawking Radiation in an Optical
Analogue.” Nature 655, no. 8122 (2026): 336–41. https://doi.org/10.1038/s41586-026-10720-3.'
ieee: 'L. M. Procopio Peña, R. Aguero-Santacruz, D. Bermudez, and U. Leonhardt,
“Backreaction of stimulated Hawking radiation in an optical analogue,” Nature,
vol. 655, no. 8122, pp. 336–341, 2026, doi: 10.1038/s41586-026-10720-3.'
mla: Procopio Peña, Lorenzo Manuel, et al. “Backreaction of Stimulated Hawking Radiation
in an Optical Analogue.” Nature, vol. 655, no. 8122, Springer Science and
Business Media LLC, 2026, pp. 336–41, doi:10.1038/s41586-026-10720-3.
short: L.M. Procopio Peña, R. Aguero-Santacruz, D. Bermudez, U. Leonhardt, Nature
655 (2026) 336–341.
date_created: 2026-07-09T07:30:44Z
date_updated: 2026-07-09T07:31:49Z
doi: 10.1038/s41586-026-10720-3
intvolume: ' 655'
issue: '8122'
language:
- iso: eng
page: 336-341
publication: Nature
publication_identifier:
issn:
- 0028-0836
- 1476-4687
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: Backreaction of stimulated Hawking radiation in an optical analogue
type: journal_article
user_id: '105816'
volume: 655
year: '2026'
...
---
_id: '66075'
abstract:
- lang: eng
text: Indefinite causal order (ICO) has the potential to be a new resource
for quantum information processing. In most of its experiments, ICO has been investigated
in a photonic platform. Here, we investigate ICO in a cavity quantum electrodynamics
system composed of two cavities. Our results show that ICO can create highly entangled
states of two distant cavity fields that never interact directly independent of
the initial (excited or ground) state of the atom. These entangled states can
have the form of one- or two-photon NOON states. We show that ICO can interchange
one photon between both cavities without changing the state of the atom, something
that is impossible to achieve for two cavities in well-defined order. Furthermore,
the vacuum Rabi oscillations either disappear or lose their sinusoidal form with
ICO. Our results show the potential that ICO can offer in the paradigm of light-matter
interaction for coherently controlling atom-field observables.
article_number: '023295'
article_type: original
author:
- first_name: Luis Octavio
full_name: Castaños-Cervantes, Luis Octavio
last_name: Castaños-Cervantes
- first_name: Lorenzo Manuel
full_name: Procopio Peña, Lorenzo Manuel
id: '105816'
last_name: Procopio Peña
- first_name: Tim J.
full_name: Bartley, Tim J.
last_name: Bartley
citation:
ama: Castaños-Cervantes LO, Procopio Peña LM, Bartley TJ. Indefinite causal order
in cavity quantum electrodynamics. Physical Review Research. 2026;8(2).
doi:10.1103/wgr6-1g5m
apa: Castaños-Cervantes, L. O., Procopio Peña, L. M., & Bartley, T. J. (2026).
Indefinite causal order in cavity quantum electrodynamics. Physical Review
Research, 8(2), Article 023295. https://doi.org/10.1103/wgr6-1g5m
bibtex: '@article{Castaños-Cervantes_Procopio Peña_Bartley_2026, title={Indefinite
causal order in cavity quantum electrodynamics}, volume={8}, DOI={10.1103/wgr6-1g5m},
number={2023295}, journal={Physical Review Research}, publisher={American Physical
Society (APS)}, author={Castaños-Cervantes, Luis Octavio and Procopio Peña, Lorenzo
Manuel and Bartley, Tim J.}, year={2026} }'
chicago: Castaños-Cervantes, Luis Octavio, Lorenzo Manuel Procopio Peña, and Tim
J. Bartley. “Indefinite Causal Order in Cavity Quantum Electrodynamics.” Physical
Review Research 8, no. 2 (2026). https://doi.org/10.1103/wgr6-1g5m.
ieee: 'L. O. Castaños-Cervantes, L. M. Procopio Peña, and T. J. Bartley, “Indefinite
causal order in cavity quantum electrodynamics,” Physical Review Research,
vol. 8, no. 2, Art. no. 023295, 2026, doi: 10.1103/wgr6-1g5m.'
mla: Castaños-Cervantes, Luis Octavio, et al. “Indefinite Causal Order in Cavity
Quantum Electrodynamics.” Physical Review Research, vol. 8, no. 2, 023295,
American Physical Society (APS), 2026, doi:10.1103/wgr6-1g5m.
short: L.O. Castaños-Cervantes, L.M. Procopio Peña, T.J. Bartley, Physical Review
Research 8 (2026).
date_created: 2026-06-29T08:08:42Z
date_updated: 2026-07-07T07:29:09Z
doi: 10.1103/wgr6-1g5m
intvolume: ' 8'
issue: '2'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
issn:
- 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Indefinite causal order in cavity quantum electrodynamics
type: journal_article
user_id: '105816'
volume: 8
year: '2026'
...
---
_id: '60136'
abstract:
- lang: eng
text: Modulation conditioned on measurements on entangled photonic quantum
states is a cornerstone technology of optical quantum information processing.
Performing this task with low latency requires combining single-photon-level detectors
with both electronic logic processing and optical modulation in close proximity.
Here, we demonstrate low-latency feedforward using a quasi-photon-number-resolved
measurement on a quantum light source. Specifically, we use a multipixel superconducting
nanowire single-photon detector, amplifier, logic, and an integrated electro-optic
modulator in situ below 4 K. We modulate
the signal mode of a spontaneous parametric down-conversion source, conditional
on a photon-number measurement of the idler mode, with a total latency of (23±3)ns.
Furthermore, we investigate the resulting change in the photon statistics. This
represents an important benchmark for the fastest quantum photonic feedforward
experiments comprising measurement, amplification, logic, and modulation. This
has direct applications in quantum computing, communication, and simulation protocols.
article_number: '720'
author:
- first_name: Frederik
full_name: Thiele, Frederik
id: '50819'
last_name: Thiele
orcid: 0000-0003-0663-5587
- first_name: Niklas
full_name: Lamberty, Niklas
id: '75307'
last_name: Lamberty
- first_name: Thomas
full_name: Hummel, Thomas
id: '83846'
last_name: Hummel
orcid: 0000-0001-8627-2119
- first_name: Nina Amelie
full_name: Lange, Nina Amelie
id: '56843'
last_name: Lange
orcid: 0000-0001-6624-7098
- first_name: Lorenzo Manuel
full_name: Procopio Peña, Lorenzo Manuel
id: '105816'
last_name: Procopio Peña
- first_name: Aishi
full_name: Barua, Aishi
id: '104502'
last_name: Barua
- first_name: Sebastian
full_name: Lengeling, Sebastian
id: '44373'
last_name: Lengeling
- first_name: Viktor
full_name: Quiring, Viktor
last_name: Quiring
- 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: Tim
full_name: Bartley, Tim
id: '49683'
last_name: Bartley
citation:
ama: Thiele F, Lamberty N, Hummel T, et al. Cryogenic feedforward of a photonic
quantum state. Optica. 2025;12(5). doi:10.1364/optica.551287
apa: Thiele, F., Lamberty, N., Hummel, T., Lange, N. A., Procopio Peña, L. M., Barua,
A., Lengeling, S., Quiring, V., Eigner, C., Silberhorn, C., & Bartley, T.
(2025). Cryogenic feedforward of a photonic quantum state. Optica, 12(5),
Article 720. https://doi.org/10.1364/optica.551287
bibtex: '@article{Thiele_Lamberty_Hummel_Lange_Procopio Peña_Barua_Lengeling_Quiring_Eigner_Silberhorn_et
al._2025, title={Cryogenic feedforward of a photonic quantum state}, volume={12},
DOI={10.1364/optica.551287},
number={5720}, journal={Optica}, publisher={Optica Publishing Group}, author={Thiele,
Frederik and Lamberty, Niklas and Hummel, Thomas and Lange, Nina Amelie and Procopio
Peña, Lorenzo Manuel and Barua, Aishi and Lengeling, Sebastian and Quiring, Viktor
and Eigner, Christof and Silberhorn, Christine and et al.}, year={2025} }'
chicago: Thiele, Frederik, Niklas Lamberty, Thomas Hummel, Nina Amelie Lange, Lorenzo
Manuel Procopio Peña, Aishi Barua, Sebastian Lengeling, et al. “Cryogenic Feedforward
of a Photonic Quantum State.” Optica 12, no. 5 (2025). https://doi.org/10.1364/optica.551287.
ieee: 'F. Thiele et al., “Cryogenic feedforward of a photonic quantum state,”
Optica, vol. 12, no. 5, Art. no. 720, 2025, doi: 10.1364/optica.551287.'
mla: Thiele, Frederik, et al. “Cryogenic Feedforward of a Photonic Quantum State.”
Optica, vol. 12, no. 5, 720, Optica Publishing Group, 2025, doi:10.1364/optica.551287.
short: F. Thiele, N. Lamberty, T. Hummel, N.A. Lange, L.M. Procopio Peña, A. Barua,
S. Lengeling, V. Quiring, C. Eigner, C. Silberhorn, T. Bartley, Optica 12 (2025).
date_created: 2025-06-04T18:34:16Z
date_updated: 2025-06-12T09:56:47Z
doi: 10.1364/optica.551287
intvolume: ' 12'
issue: '5'
language:
- iso: eng
publication: Optica
publication_identifier:
issn:
- 2334-2536
publication_status: published
publisher: Optica Publishing Group
status: public
title: Cryogenic feedforward of a photonic quantum state
type: journal_article
user_id: '56843'
volume: 12
year: '2025'
...