Quantum communication network is one step closer! Chinese scientists realize pattern matching Quantum key Distribution
According to news from CTOnews.com on February 5, Pan Jianwei and Chen Tengyun of the University of Science and Technology of China, in cooperation with Ma Xiongfeng of Tsinghua University, realized pattern matching quantum key distribution for the first time in experiments.
CTOnews.com learned that the relevant research results have been published in the international academic journal physical Review KuaiBao, DOI:10.1103/PhysRevLett.130.030801.
The research results show that pattern matching quantum key distribution can achieve long-distance secure coding without laser frequency and phase locking, and has a high code rate in metropolitan distance, which greatly reduces the difficulty of protocol implementation. it is of great significance to the construction of quantum communication network in the future.
▲ diagram source: quantum key distribution (QKD) of University of Science and Technology of China (USTC) is based on the basic principles of quantum mechanics and can achieve unconditionally secure secure communication in theory, so it has been a hot topic in academic circles in recent decades.
According to reports, pattern matching Quantum key Distribution Protocol (MP-QKD) is a new measurement device-independent quantum key distribution protocol proposed by Ma Xiongfeng Research Group of Tsinghua University in 2022. Compared with the original measurement device-independent protocol (MDI-QKD), more detection events can be used for coding, thus greatly improving the bit rate. Compared with dual-field quantum key distribution protocol (TF-QKD) and phase matching protocol (PM-QKD), it can save cost and reduce the difficulty of practical application, and has better anti-jamming ability to environmental noise.
In this project, Pan Jianwei and Chen Tengyun's research team based on the MP-QKD protocol proposed by Ma Xiongfeng Research Group of Tsinghua University, used the data post-processing method of maximum likelihood estimation to accurately estimate the frequency difference of two independent lasers for parameter estimation, and combined with the high efficiency single photon detector developed by you Lixing team of Shanghai Institute of Microsystems, Chinese Academy of Sciences. The security coding of laboratory standard optical fiber 100km, 200km, 300km and ultra-low loss optical fiber 400km is realized. Compared with the original MDI experiment, the bit rate is significantly improved, and the code rate at 300km and 400km distance is three orders of magnitude higher than that of previous experiments.
