Process-fidelity estimation of a linear optical quantum-controlled-Z gate: A comparative study
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F14%3A33149933" target="_blank" >RIV/61989592:15310/14:33149933 - isvavai.cz</a>
Result on the web
<a href="http://journals.aps.org/pra/pdf/10.1103/PhysRevA.89.042304" target="_blank" >http://journals.aps.org/pra/pdf/10.1103/PhysRevA.89.042304</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevA.89.042304" target="_blank" >10.1103/PhysRevA.89.042304</a>
Alternative languages
Result language
angličtina
Original language name
Process-fidelity estimation of a linear optical quantum-controlled-Z gate: A comparative study
Original language description
We present a systematic comparison of different methods of fidelity estimation of a linear optical quantumcontrolled-Z gate implemented by two-photon interference on a partially polarizing beam splitter. We utilize a linear fidelity estimator based on the Monte Carlo sampling technique as well as a nonlinear estimator based on maximum likelihood reconstruction of a full quantum-process matrix. In addition, we evaluate the lower bound on quantum-gate fidelity determined by average quantum-state fidelities for two mutually unbiased bases. In order to probe various regimes of operation of the gate we introduce a tunable time delay between the two photons. This allows us to move from high-fidelity operation to a regime where the photons become distinguishable and the success probability of the scheme significantly depends on the input state. We discuss in detail possible systematic effects that could influence the gate-fidelity estimation.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BH - Optics, masers and lasers
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach
Others
Publication year
2014
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
1050-2947
e-ISSN
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Volume of the periodical
89
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
"042304-1"-"042304-10"
UT code for WoS article
000333990800003
EID of the result in the Scopus database
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