Abstract
A novel method of quantum key distribution (QKD) based on hybrid fiber-wireless system is proposed in this paper. Quantum key from a center station (i.e., Alice) is transmitted through an optical fiber to a base station and then wirelessly forwarded to mobile nodes (i.e., Bobs). QKD protocol is implemented by using subcarrier intensity modulation, where binary phase shift keying (BPSK) signaling is used for encoding and direct detection with a dual-threshold receiver is employed for decoding. We derive the mathematical expressions for security analysis of the proposed system in terms of quantum bit error rate and ergodic secret-key rate taking into account the channel loss and receiver noise. The feasibility of the proposed QKD system is validated via the numerical results.
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