Coherent detection schemes for subcarrier wave continuous variable quantum key distribution
E.O. Samsonov, R. Goncharov, M.A. Fadeev, Alexander T. Zinoviev, Danylo Kirichenko, Boris Aleksandrovich Nasedkin, Alexei D. Kiselev, V. I. Egorov · Journal of the Optical Society of America B · 2021
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.