Phase-matching quantum key distribution with advantage distillation
Rui-Qiang Wang, Chun-Mei Zhang, Zhen−Qiang Yin, Hong-Wei Li, Shuang Wang, Wei Chen, Guang‐Can Guo, Zheng‐Fu Han · New Journal of Physics · 2022
Abstract Phase-matching quantum key distribution (PM-QKD) provides a promising solution to surpass the fundamental rate–distance bound without quantum repeaters. In this paper, we insert an additional advantage distillation (AD) step after quantum communication to improve the performance of PM-QKD. Simulation results show that, by splitting the raw key into blocks of only a few bits so as to identify highly correlated bit pairs, the AD method can tolerate high system misalignment errors and improve the secret key rate and transmission distance significantly, which is very promising in current PM-QKD systems.