Coexistence of Continuous-Variable Quantum Key Distribution and Classical Data over 120 km Fiber
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73632078" target="_blank" >RIV/61989592:15310/25:73632078 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prl/pdf/10.1103/zy2d-m3ch" target="_blank" >https://journals.aps.org/prl/pdf/10.1103/zy2d-m3ch</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/zy2d-m3ch" target="_blank" >10.1103/zy2d-m3ch</a>
Alternative languages
Result language
angličtina
Original language name
Coexistence of Continuous-Variable Quantum Key Distribution and Classical Data over 120 km Fiber
Original language description
Integrating quantum key distribution (QKD) with classical data transmission over the same fiber is crucial for scalable quantum-secured communication. However, noise from classical channels limits QKD distance. We demonstrate the longest-distance continuous-variable QKD (CV-QKD) over 120 km (20 dB loss) in the asymptotic regime, and over 100 km (17 dB loss) in the finite-size regime, both coexisting with a fully populated coarse wavelength division multiplexing system. Natural mode filtering of the local oscillator and phase noise mitigation enabled this without additional filtering or wavelength reallocation. Benchmarking against a commercial discrete-variable QKD system and considering finite-size effects confirms the feasibility of CV-QKD as a plug-and-play solution for typical 80–100 km long-haul optical networks. Our results set a record fiber distance for CV-QKD, showing its potential for cost-effective, large-scale deployment in existing network infrastructure.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - 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)
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)
Others
Publication year
2025
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 LETTERS
ISSN
0031-9007
e-ISSN
1079-7114
Volume of the periodical
135
Issue of the periodical within the volume
17
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
"170804-1"-"170804-6"
UT code for WoS article
001616060900004
EID of the result in the Scopus database
2-s2.0-105021199967