Long-distance continuous-variable quantum key distribution over 100- km fiber with local local oscillator

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F24%3A73621869" target="_blank" >RIV/61989592:15310/24:73621869 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.science.org/doi/epdf/10.1126/sciadv.adi9474" target="_blank" >https://www.science.org/doi/epdf/10.1126/sciadv.adi9474</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1126/sciadv.adi9474" target="_blank" >10.1126/sciadv.adi9474</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Long-distance continuous-variable quantum key distribution over 100- km fiber with local local oscillator

Popis výsledku v původním jazyce

Quantum key distribution (QKD) enables two remote parties to share encryption keys with security based on the laws of physics. Continuous-variable (CV) QKD with coherent states and coherent detection integrates well with existing telecommunication networks. Thus far, long-distance CV-QKD has only been demonstrated using a highly complex scheme where the local oscillator is transmitted, opening security loopholes for eavesdroppers and limit-ing potential applications. Here, we report a long-distance CV-QKD experiment with a locally generated local os-cillator over a 100- kilometer fiber channel with a total loss of 15.4 decibels. This record- breaking distance is achieved by controlling the phase noise–induced excess noise through a machine learning framework for carrier recovery and optimizing the modulation variance. We implement the full CV-QKD protocol and demonstrate the generation of keys secure against collective attacks in the finite- size regime. Our results mark a substantial mile-stone for realizing CV quantum access networks with a high loss budget and pave the way for large- scale deploy-ment of secure QKD.

Název v anglickém jazyce

Long-distance continuous-variable quantum key distribution over 100- km fiber with local local oscillator

Popis výsledku anglicky

Quantum key distribution (QKD) enables two remote parties to share encryption keys with security based on the laws of physics. Continuous-variable (CV) QKD with coherent states and coherent detection integrates well with existing telecommunication networks. Thus far, long-distance CV-QKD has only been demonstrated using a highly complex scheme where the local oscillator is transmitted, opening security loopholes for eavesdroppers and limit-ing potential applications. Here, we report a long-distance CV-QKD experiment with a locally generated local os-cillator over a 100- kilometer fiber channel with a total loss of 15.4 decibels. This record- breaking distance is achieved by controlling the phase noise–induced excess noise through a machine learning framework for carrier recovery and optimizing the modulation variance. We implement the full CV-QKD protocol and demonstrate the generation of keys secure against collective attacks in the finite- size regime. Our results mark a substantial mile-stone for realizing CV quantum access networks with a high loss budget and pave the way for large- scale deploy-ment of secure QKD.

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

<a href="/cs/project/GN22-28254O" target="_blank" >GN22-28254O: Praktická víceuživatelská bezpečná kvantová komunikace</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Science Advances

ISSN

2375-2548

e-ISSN

—

Svazek periodika

10

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

"eadi9474-1"-"eadi9474-7"

Kód UT WoS článku

001135659900008

EID výsledku v databázi Scopus

2-s2.0-85181629186