Continuous-variable quantum key distribution at 10 GBaud using an integrated photonic-electronic receiver

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F24%3A73626073" target="_blank" >RIV/61989592:15310/24:73626073 - isvavai.cz</a>
Result on the web
<a href="https://opg.optica.org/directpdfaccess/39a0ce73-2b85-4210-972c5ea802f030a3_554789/optica-11-9-1197.pdf" target="_blank" >https://opg.optica.org/directpdfaccess/39a0ce73-2b85-4210-972c5ea802f030a3_554789/optica-11-9-1197.pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1364/OPTICA.530080" target="_blank" >10.1364/OPTICA.530080</a>

Result language
angličtina
Original language name
Continuous-variable quantum key distribution at 10 GBaud using an integrated photonic-electronic receiver
Original language description
Quantum key distribution (QKD) is a widely recognized application of quantum information theory, guaranteeing information-theoretically secure key exchange. However, commercial viability of QKD systems is currently impeded by issues such as scalability, network integration, and high manufacturing costs. Low-cost, high-volume production of photonic and electronic integrated circuits could be the breakthrough needed for broad-scale deployment of cutting-edge QKD systems. Here, we present a continuous-variable (CV) QKD system that is based on an integrated photonic-electronic receiver. It combines a silicon photonic integrated circuit, featuring a phase-diverse receiver, with custom-designed GaAs pHEMT transimpedance amplifiers. Operating at a classical telecom symbol rate of 10 GBaud, our QKD system generates high secret key rates - exceeding 0.7 Gb/s over a 5 km distance and 0.3 Gb/s over a 10 km. The secret keys are secure against collective attacks, even when accounting for finite-size effects in the parameter estimation, thanks to well-designed digital signal processing that enables broadband system operation. Our experiment sets a record for secure key exchange and paves the way for the implementation of real-time broadband CV-QKD systems.
Czech name
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Czech description
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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)

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

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