Coexistence of Continuous-Variable Quantum Key Distribution and Classical Data over 120 km Fiber

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Coexistence of Continuous-Variable Quantum Key Distribution and Classical Data over 120 km Fiber

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Coexistence of Continuous-Variable Quantum Key Distribution and Classical Data over 120 km Fiber

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

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)

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

PHYSICAL REVIEW LETTERS

ISSN

0031-9007

e-ISSN

1079-7114

Svazek periodika

135

Číslo periodika v rámci svazku

17

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

"170804-1"-"170804-6"

Kód UT WoS článku

001616060900004

EID výsledku v databázi Scopus

2-s2.0-105021199967