Long-distance continuous-variable measurement-device-independent quantum key distribution with discrete modulation

作     者：Hong-Xin Ma Peng Huang Dong-Yun Bai Tao Wang Shi-Yu Wang Wan-Su Bao Gui-Hua Zeng 

作者机构：Zhengzhou Information Science and Technology Institute Zhengzhou 450004 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China State Key Laboratory of Advanced Optical Communication Systems and Networks and Center of Quantum Information Sensing and Processing Shanghai Jiao Tong University Shanghai 200240 China 

出 版 物：《Physical Review A》 (Phys. Rev. A)

年 卷 期：2019年第99卷第2期

页      面：022322-022322页

核心收录：

基　　金：National Natural Science Foundation of China, NSFC, (11304397, 61332019, 61505261, 61605248, 61671287, 61675235) National Natural Science Foundation of China, NSFC National Basic Research Program of China (973 Program), (2013CB338002, 2016YFA0302600) National Basic Research Program of China (973 Program) 

主　　题：Quantum communication Quantum cryptography Quantum information processing with continuous variables 

摘      要：We propose a long-distance continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol with discrete modulation. This kind of discrete-modulated scheme has good compatibility with efficient error correction code, which leads to higher reconciliation efficiency even at low signal-to-noise ratio. Security analysis shows that the proposed protocol is secure against arbitrary collective attacks in the asymptotic limit with the proper use of decoy states. With the use of discrete modulation, the proposed CV-MDI-QKD protocol has simpler implementation and outperforms previous protocols in terms of achievable maximal transmission distance, which precisely solved the bottleneck of the original Gaussian-modulated CV-MDI-QKD protocol.