量子密钥分配
连续变量
协议(科学)
钥匙(锁)
计算机科学
变量(数学)
量子
分布式计算
理论计算机科学
数学
计算机安全
数学优化
物理
量子力学
医学
数学分析
替代医学
病理
作者
Xueqin Jiang,S. Xue,Jiahao Tang,Peng Huang,Guihua Zeng
出处
期刊:Quantum science and technology
[IOP Publishing]
日期:2024-02-08
卷期号:9 (2): 025008-025008
被引量:3
标识
DOI:10.1088/2058-9565/ad1f3c
摘要
Abstract In continuous-variable quantum key distribution systems, reconciliation is a crucial step that significantly affects the secret key rate (SKR). The rateless protocol based on Raptor codes can achieve high reconciliation efficiency at low signal-to-noise ratios (SNRs). However, the high complexity of low-density parity-check (LDPC) codes used for the precoding in Raptor codes limits the speed of reconciliation. In this paper, we propose an adaptive reconciliation protocol by modifying Raptor codes. The length of random binary sequences is increased because we remove the LDPC precoding that adds redundancy. The modified Raptor codes reduce the complexity of encoding with better performance. The proposed protocol gives a reconciliation efficiency higher than 98.1% in the SNR below −20 dB and maintains a certain SKR in long-distance transmission.
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