Quantum key distribution solution over indoor visible light communication networks

Abstract

In this paper, we study an application of quantum key distribution (QKD) for indoor visible light communication (VLC) networks. Continuous variable QKD (CV-QKD) is used due to the fact that it is less expensive, working at room temperature, and much easier to implement. We design and analyze the security performance of the CV-QKD protocol based on sub-carrier intensity modulation (SIM) over indoor VLC systems taking into account the effects of VLC channel and other physical layer impairments. The mathematical expressions for quantum bit-error rate (QBER) and secret-key rate are derived. Based on the mathematical expressions, various systems' metrics, including the modulation depth and the dual-threshold scale coefficient, can be determined so as to QBER and secret-key rate meet the design criteria.