Phase estimation in driven discrete-time quantum walks
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00368750" target="_blank" >RIV/68407700:21340/23:00368750 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevA.108.042607" target="_blank" >https://doi.org/10.1103/PhysRevA.108.042607</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevA.108.042607" target="_blank" >10.1103/PhysRevA.108.042607</a>
Alternative languages
Result language
angličtina
Original language name
Phase estimation in driven discrete-time quantum walks
Original language description
Quantum walks have been shown to be important for quantum metrological tasks, in particular for the estimation of the evolution parameters of the walk. In this work, we address the enhancement of this parameter estimation using the driven discrete-time quantum walk (DDTQW), which is a variant of the discrete-time quantum walk with multiple walkers. DDTQW has two regimes based on the interference between the walker number, i.e., phase matched and phase mismatched. We derive an expression for the quantum Fisher information (QFI) in the phase-matched regime of DDTQW driven using the squeezing operator, demonstrating an exponential increase in QFI. In the phase-mismatched regime, QFI varies as t2, consistent with previous studies. Our analysis shows that parameter estimation can be improved by driving the walk using squeezing operators.
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
2023
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
108
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
1-11
UT code for WoS article
001089579800008
EID of the result in the Scopus database
2-s2.0-85174538934