作者
Eduard Samsonov, Roman Goncharov, Andrei Gaidash, Anton Kozubov, Vladimir Egorov, Artur Gleim
发表日期
2020/6/22
期刊
Scientific Reports
卷号
10
期号
1
页码范围
10034
出版商
Nature Publishing Group UK
简介
In this paper we report a continuous-variable quantum key distribution protocol using multimode coherent states generated on subcarrier frequencies of the optical spectrum. We propose a coherent detection scheme where power from a carrier wave is used as a local oscillator. We compose a mathematical model of the proposed scheme and perform its security analysis in the finite-size regime using fully quantum asymptotic equipartition property technique. We calculate a lower bound on the secret key rate for the system under the assumption that the quantum channel noise is negligible compared to detector dark counts, and an eavesdropper is restricted to collective attacks. Our calculation shows that the current realistic system implementation would allow distributing secret keys over channels with losses up to 9 dB.
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E Samsonov, R Goncharov, A Gaidash, A Kozubov… - Scientific Reports, 2020