Reconciliation for CV-QKD using globally-coupled LDPC codes  

作　　者：Jin-Jing Shi Bo-Peng Li Duan Huang 石金晶;李伯鹏;黄端(School of Computer Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]School of Computer Science and Engineering,Central South University,Changsha 410083,China

出　　处：《Chinese Physics B》2020年第4期139-145,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.61801522,61972418,and 61872390);the Natural Science Foundation of Hunan Province,China(Grant Nos.2019JJ40352 and 2017JJ3415);the Special Foundation for Distinguished Young Scientists of Changsha City,China(Grant No.kq1905058)。

摘　　要：Reconciliation is a necessary step in postprocessing of continuous-variable quantum key distribution(CV-QKD)system.We use globally coupled low-density parity-check(GC-LDPC)codes in reconciliation to extract a precise secret key from the raw keys over the authenticated classical public channel between two users.GC-LDPC codes have excellent performance over both the additive Gaussian white noise and binary-erasure channels.The reconciliation based on GC-LDPC codes can improve the reconciliation efficiency to 95.42% and reduce the frame error rate to 3.25×10^-3.Using distillation,the decoding speed can achieve 23.8 Mbits/s and decrease the cost of memory.Given decoding speed and low memory usage,this makes the proposed reconciliation method viable approach for high-speed CV-QKD system.

关 键 词：continuous-variable quantum key distribution globally COUPLED LOW-DENSITY parity-check RECONCILIATION efficiency frame error rate 

分 类 号：TN918[电子电信—通信与信息系统] O413[电子电信—信息与通信工程]