Process-fidelity estimation of a linear optical quantum-controlled-Z gate: A comparative study

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Process-fidelity estimation of a linear optical quantum-controlled-Z gate: A comparative study

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Process-fidelity estimation of a linear optical quantum-controlled-Z gate: A comparative study

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BH - Optika, masery a lasery

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Physical Review A

ISSN

1050-2947

e-ISSN

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Svazek periodika

89

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

"042304-1"-"042304-10"

Kód UT WoS článku

000333990800003

EID výsledku v databázi Scopus

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