Modulation leakage vulnerability in continuous-variable quantum key distribution

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F21%3A73607369" target="_blank" >RIV/61989592:15310/21:73607369 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/2058-9565/ac0d4c/pdf" target="_blank" >https://iopscience.iop.org/article/10.1088/2058-9565/ac0d4c/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/2058-9565/ac0d4c" target="_blank" >10.1088/2058-9565/ac0d4c</a>

Result language

angličtina

Original language name

Modulation leakage vulnerability in continuous-variable quantum key distribution

Original language description

Flaws in the process of modulation, or encoding of key bits in the quadratures of the electromagnetic light field, can make continuous-variable quantum key distribution systems susceptible to leakage of secret information. Here, we report such a modulation leakage vulnerability in a system that uses an optical in-phase and quadrature modulator to implement a single sideband encoding scheme. The leakage arises from the limited suppression of a quantum-information-carrying sideband during modulation. Based on the results from a proof-of-concept experiment, we theoretically analyze the impact of this vulnerability and show that the leakage reduces the range over which secret key can be obtained, and can even lead to a security breach, if disregarded. We also study the efficacy of additional trusted noise to counter this vulnerability.

Czech name

—

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

Quantum Science and Technology

ISSN

2058-9565

e-ISSN

—

Volume of the periodical

6

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

"045001-1"-"045001-11"

UT code for WoS article

000680167800001

EID of the result in the Scopus database

2-s2.0-85112785582