Quantum metrology in a nonlinear interferometer with feedback

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Quantum metrology in a nonlinear interferometer with feedback

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Quantum metrology in a nonlinear interferometer with feedback

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

<a href="/cs/project/GA23-07169S" target="_blank" >GA23-07169S: Vícečásticová kvantová dynamika na grafech a hypergrafech – teorie a aplikace</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

PHYSICAL REVIEW A

ISSN

2469-9926

e-ISSN

2469-9934

Svazek periodika

112

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

1-10

Kód UT WoS článku

001546288500007

EID výsledku v databázi Scopus

2-s2.0-105021868665