PM-QKD协议的共纤传输研究

Quantum key distribution (QKD) allows secure communication with the quantum theoretical guarantees. The Twin-Field QKD (TF-QKD) protocol breaks the quantum channel secret key capacity limit for the first time without a quantum repeater. The Phase Matching QKD (PM-QKD) protocol proves that the TF-QKD protocol is unconditionally secure. With the development of quantum communication networks, it is feasible and economical to combine quantum key distribution with classical optical communication over the same optical fibre using dense wavelength division multiplexing (DWDM) technology. In this paper, a scheme for the PM-QKD protocol using DWDM technology is proposed and its performance is analysed, considering the effects of quantum channel count and crosstalk noise on the secure key rate. The simulation results show that the scheme further improves the key rate of PM-QKD. Thus, the scheme provides a method to improve thesecert key rate for real quantum networks.