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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Long-distance continuous-variable quantum key distribution over 100- km fiber with local local oscillator
Original language description
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.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10306 - Optics (including laser optics and quantum optics)

Project
<a href="/en/project/GN22-28254O" target="_blank" >GN22-28254O: Practical multi-user secure quantum communication</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)