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arXiv:2006.16543 · Journal of the Optical Society of America B

Coherent detection schemes for subcarrier wave continuous variable quantum key distribution

E.O. Samsonov, R. Goncharov, M.A. Fadeev, A. Zinoviev, Danylo Kirichenko, Boris Aleksandrovich Nasedkin, Alexei D. Kiselev, V. I. Egorov

Published Jun 11, 2021• 16 citations
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Abstract

We examine different methods to implement coherent detection in subcarrier wave quantum key distribution (SCW QKD) systems. For classical wave fields, we present the models describing homodyne-type and heterodyne-type coherent detection schemes needed to extract information from the quadrature phase-coded multimode signals used in SCW QKD. Practical feasibility of the proposed schemes is corroborated by experiments.

DOI
10.1364/josab.424516

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We propose a novel heterodyne detection scheme for continuous-variable quantum key distribution (CVQKD), which measures both quadrature components of a quantum signal encoded in optical phase space. The proposed method uses time division to achieve identical performance to conventional heterodyne detection with only a single homodyne detection system. Our method also uses a Faraday-Michelson interferometer to make it independent of polarization drift and eliminate the need for dynamic polarization control. Our method is experimentally demonstrated using the Gaussian-modulated coherent-states (GMCS) protocol over a 20.06 km optical fiber channel, achieving an expected secret key rate of up to 0.187 Mbps.
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