Improving Key Rate of Optical Fiber Quantum Key Distribution System Based on Channel Tomography

被引：5
|
作者：
Zhu, Chang-Hua [1 ]
Quan, Dong-Xiao [1 ]
Zhang, Fang [1 ]
Pei, Chang-Xing [1 ]
机构：
[1] Xidian Univ, State Key Lab Integrated Serv Networks, Xian 710071, Peoples R China
来源：
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS | 2013年 / 52卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Quantum key distribution; Tomography; Information reconciliation; Quantum bit error rate; Eavesdropping;
D O I：
10.1007/s10773-012-1365-6
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate the key rate of polarization-coded optical fiber-based quantum key distribution system (QKD) with BB84 protocol by channel tomography. The quantum bit error rate (QBER) of the QKD system under depolarizing channel is obtained by analyzing output density operators, transmission rate of channel, transmission rate of the receiver and dark count of single photon detector. According to the estimated QBER an LDPC chosen adaptively is applied to information reconciliation and the practical final key rate is discussed. Analysis results show that compared with cascade scheme and no channel knowledge the key rate can be improved by the proposed reconciliation scheme with channel tomography.
引用
收藏
页码：596 / 603
页数：8
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