High-efficiency reconciliation for continuous variable quantum key distribution

被引：27
|
作者：
Bai, Zengliang [1 ,2 ]
Yang, Shenshen [1 ,2 ]
Li, Yongmin [1 ,2 ]
机构：
[1] Shanxi Univ, Inst Optoelect, State Key Lab Quantum Opt & Quantum Opt Devices, Taiyuan 030006, Peoples R China
[2] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2017年 / 56卷 / 04期
基金：
中国国家自然科学基金;
关键词：
PARITY-CHECK CODES; INFORMATION; SECURITY; DESIGN;
D O I：
10.7567/JJAP.56.044401
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Quantum key distribution (QKD) is the most mature application of quantum information technology. Information reconciliation is a crucial step in QKD and significantly affects the final secret key rates shared between two legitimate parties. We analyze and compare various construction methods of low-density parity-check (LDPC) codes and design high-performance irregular LDPC codes with a block length of 10(6). Starting from these good codes and exploiting the slice reconciliation technique based on multilevel coding and multistage decoding, we realize high-efficiency Gaussian key reconciliation with efficiency higher than 95% for signal-to-noise ratios above 1. Our demonstrated method can be readily applied in continuous variable QKD. (C) 2017 The Japan Society of Applied Physics
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页数：5
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