Increasing efficiency of a linear-optical quantum gate using electronic feed-forward

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F12%3A33139252" target="_blank" >RIV/61989592:15310/12:33139252 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1103/PhysRevA.85.012305" target="_blank" >http://dx.doi.org/10.1103/PhysRevA.85.012305</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.85.012305" target="_blank" >10.1103/PhysRevA.85.012305</a>

Result language

angličtina

Original language name

Increasing efficiency of a linear-optical quantum gate using electronic feed-forward

Original language description

We have successfully used fast electronic feed-forward to increase the probability of success of a linear optical implementation of a programmable phase gate from 25% to its theoretical limit of 50%. The feed-forward applies a conditional unitary operation, which changes the incorrect output states of the data qubit to the correct ones. The gate itself rotates an arbitrary quantum state of the data qubit around the z axis of the Bloch sphere with the angle of rotation being fully determined by the stateof the program qubit. The gate implementation is based on fiber optics components. Qubits are encoded into spatial modes of single photons. The signal from the feed-forward detector is led directly to a phase modulator using only a passive voltage divider. We have verified the increase of the probability of success and characterized the gate operation by means of quantum process tomography. We have demonstrated that the use of feed-forward affects neither the process fidelity nor the ou

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BH - Optics, masers and lasers

OECD FORD branch

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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>Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2012

Confidentiality

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

Name of the periodical

Physical Review A

ISSN

1050-2947

e-ISSN

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Volume of the periodical

85

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

4

Pages from-to

"012305-1"-"012305-4"

UT code for WoS article

000298860600007

EID of the result in the Scopus database

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