We examine different methods to implement coherent detection in the subcarrier wave quantum key distribution (SCW QKD) systems. For classical wavefields, 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 the experiments.
@article{arxiv.2006.16543,
title = {Coherent detection schemes for subcarrier wave continuous variable quantum key distribution},
author = {Eduard Samsonov and Roman Goncharov and Maxim Fadeev and Alexandr Zinoviev and Daniil Kirichenko and Boris Nasedkin and Alexei Kiselev and Vladimir Egorov},
journal= {arXiv preprint arXiv:2006.16543},
year = {2021}
}