基于Polar码的纠错延后量子协商协议  

A reconciliation protocol with delayed error correction for quantum key distribution

作　　者：肖红[1] 施鹏[1] 赵生妹[1] 

机构地区：[1]南京邮电大学信号处理与传输研究院,南京210009

出　　处：《中国科学：技术科学》2015年第8期843-848,共6页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:61271238;61475075);教育部高等学校博士学科点专项科研基金(编号:20123223110003);江苏省高校自然科学研究项目(编号:11KJA510002);江苏高校优势学科建设工程项目资助

摘　　要：提出了一种基于纠错(EC)延后的量子密钥分发协商协议.该协议不直接对密钥进行EC,而是将EC延后到信息交换后进行.这种量子密钥分发协商协议具有两个优点:1)EC延后可使量子密钥分发网络中不直接相连的两个节点通过共同的可信节点共享密钥串;2)EC延后可简化整个协商过程,只通过简单的信道编码就能完成EC,还能同时纠正通信过程中产生的误码和信息本身存在的误码.本文理论上分析了所提协议的密钥利用率;并以误比特率为标准,结合Polar信道编码,通过数值仿真说明所提协议的可靠性与安全性,并与等同条件下应用低密度奇偶校验码(LDPC码)的量子密钥分发协商协议进行比较,结果表明基于Polar码的协商协议可获得更加完善的性能.A delayed error-correction（EC） reconciliation protocol for quantum key distribution（QKD） is proposed in the paper, where the error correction operation is operated after the messages have been transmitted. There are two advantages of the proposed protocol. First, it is possible for the two nodes without a direct quantum link to share secret keys, when the two nodes are separately connected to a common trusted relay in the QKD network. Besides, the reconciliation protocol with the delayed EC also simplifies the whole reconciliation process. It corrects both errors caused by communications during QKD process and that inherent in message bits. The key generation rate of the delayed EC protocol is presented. Finally, the bit error rate of the proposed protocol is analyzed when using polar codes as the error correction codes. The results show that the performance of the delayed EC reconciliation protocol with polar codes were better than those using low-density parity check code.

关 键 词：量子密钥分发协商 纠错延后 Polar码 

分 类 号：TN918.4[电子电信—通信与信息系统]