Quantum metrology in a nonlinear interferometer with feedback
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00385689" target="_blank" >RIV/68407700:21340/25:00385689 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/4qm6-6bzl" target="_blank" >https://doi.org/10.1103/4qm6-6bzl</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/4qm6-6bzl" target="_blank" >10.1103/4qm6-6bzl</a>
Alternative languages
Result language
angličtina
Original language name
Quantum metrology in a nonlinear interferometer with feedback
Original language description
In this paper, we propose a nonlinear interferometer with feedback loops and explore its efficiency for phase estimation. We analyze two feedback schemes, one where both modes of the interferometer are fed back into the device and another where only one mode is fed back. The quantum Fisher information (QFI) for phase estimation in each feedback scheme increases with each feedback loop, and similar to the standard SU(1,1) nonlinear interferometer, phase estimation in this scheme is sensitive to photon loss when the inputs are vacuum state. In terms of resources, we show that, in the low-loss regime, our scheme performs better than the standard nonlinear interferometer. The feedback scheme provides the minimum phase variance when the unknown phase is small. We also provide a special case where the feedback scheme provided enhanced QFI even for large phase values. This is achieved by switching between squeezing and antisqueezing operators after every few loops.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)
Result continuities
Project
<a href="/en/project/GA23-07169S" target="_blank" >GA23-07169S: Multipartite quantum dynamics on graphs and hypergraphs – theory and applications</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
PHYSICAL REVIEW A
ISSN
2469-9926
e-ISSN
2469-9934
Volume of the periodical
112
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
1-10
UT code for WoS article
001546288500007
EID of the result in the Scopus database
2-s2.0-105021868665