Rate compatible reconciliation for continuous-variable quantum key distribution using Raptor-like LDPC codes

作     者：Chao Zhou Xiang Yu Wang ZhiGuo Zhang Song Yu ZiYang Chen Hong Guo Chao Zhou;XiangYu Wang;ZhiGuo Zhang;Song Yu;ZiYang Chen;Hong Guo

作者机构：State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Advanced Optical CommunicationSystems and NetworksDepartment of Electronicsand Center for Quantum Information TechnologyPeking UniversityBeijing 100871China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2021年第64卷第6期

页      面：26-34页

核心收录：

学科分类：11[军事学] 1105[军事学-军队指挥学] 07[理学] 0839[工学-网络空间安全] 08[工学] 070201[理学-理论物理] 110505[军事学-密码学] 110503[军事学-军事通信学] 0702[理学-物理学] 

基　　金：supported by the Key Program of National Natural Science Foundation of China(Grant No.61531003) the National Natural Science Foundation of China(Grant No.62001041) the Fund of State Key Laboratory of Information Photonics and Optical Communications 

主　　题：continuous-variable quantum key distribution reconciliation Raptor-like LDPC codes 

摘      要：In the practical continuous-variable quantum key distribution(CV-QKD)system,the postprocessing process,particularly the error correction part,significantly impacts the system ***-edge type low-density parity-check(MET-LDPC)codes are suitable for CV-QKD systems because of their Shannon-limit-approaching performance at a low signal-to-noise ratio(SNR).However,the process of designing a low-rate MET-LDPC code with good performance is extremely ***,we introduce Raptor-like LDPC(RL-LDPC)codes into the CV-QKD system,exhibiting both the rate compatible property of the Raptor code and capacity-approaching performance of MET-LDPC ***,this technique can significantly reduce the cost of constructing a new *** design the RL-LDPC matrix with a code rate of 0.02 and easily and effectively adjust this rate from 0.016 to *** results show that we can achieve more than 98%reconciliation efficiency in a range of code rate variation using only one RL-LDPC code that can support high-speed decoding with an SNR less than-16.45 d *** code allows the system to maintain a high key extraction rate under various SNRs,paving the way for practical applications of CV-QKD systems with different transmission distances.