Frequency-multiplexed entanglement for continuous-variable quantum key distribution

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F21%3A73608654" target="_blank" >RIV/61989592:15310/21:73608654 - isvavai.cz</a>

Result on the web

<a href="https://www.osapublishing.org/prj/fulltext.cfm?uri=prj-9-12-2351&id=464822" target="_blank" >https://www.osapublishing.org/prj/fulltext.cfm?uri=prj-9-12-2351&id=464822</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1364/PRJ.434979" target="_blank" >10.1364/PRJ.434979</a>

Result language

angličtina

Original language name

Frequency-multiplexed entanglement for continuous-variable quantum key distribution

Original language description

Quantum key distribution with continuous variables already uses advantageous high-speed single-mode homodyne detection with low electronic noise at room temperature. Together with continuous-variable information encoding to nonclassical states, the distance for secure key transmission through lossy channels can approach 300 km in current optical fibers. Such protocols tolerate higher channel noise and also limited data processing efficiency compared to coherent-state protocols. The secret key rate can be further increased by increasing the system clock rates, and, further, by a suitable frequency-mode-multiplexing of optical transmission channels. However, the multiplexed modes couple together in the source or any other part of the protocol. Therefore, multiplexed communication will experience cross talk and the gain can be minuscule. Advantageously, homodyne detectors allow solving this cross-talk problem by proper data processing. It is a potential advantage over protocols with single-photon detectors, which do not enable similar data processing techniques. We demonstrate the positive outcome of this methodology on the experimentally characterized frequency-multiplexed entangled source of femtosecond optical pulses with natural cross talk between eight entangled pairs of modes. As the main result, we predict the almost 15-fold higher secret key rate. This experimental test and analysis of frequency-multiplexed entanglement source open the way for the field implementation of high-capacity quantum key distribution with continuous variables.

Czech name

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Czech description

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Type

J_imp - 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)

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)

Publication year

2021

Confidentiality

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

Name of the periodical

Photonics Research

ISSN

2327-9125

e-ISSN

—

Volume of the periodical

9

Issue of the periodical within the volume

12

Country of publishing house

CN - CHINA

Number of pages

9

Pages from-to

2351-2359

UT code for WoS article

000724596800006

EID of the result in the Scopus database

2-s2.0-85120350231