J4 ›› 2012, Vol. 39 ›› Issue (2): 8-11+23.doi: 10.3969/j.issn.1001-2400.2012.02.002

• 研究论文 • 上一篇    下一篇



  1. (西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安  710071)
  • 收稿日期:2011-06-14 出版日期:2012-04-20 发布日期:2012-05-21
  • 通讯作者: 肖鹤玲
  • 作者简介:肖鹤玲(1984-),女,西安电子科技大学博士研究生,E-mail: hlxiao@stu.xidian.edu.cn.
  • 基金资助:


Application of quantum LDPC codes to quantum key distribution

XIAO Heling;CAI Ning;WANG Xiao   

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an  710071, China)
  • Received:2011-06-14 Online:2012-04-20 Published:2012-05-21
  • Contact: XIAO Heling



关键词: 信息安全, 量子密钥分配协议, 量子LDPC码, Wire-tap信道


In this paper, the security of BB84 key distribution protocol is considered. We assume that in the protocol the eavesdropper Eve intercepts/resends photons transmitted between Alice and Bob with probability ε. First, the BB84 key distribution protocol will be made equivalent to a special Wire-tap channel model, where the main channel is a binary symmetric channel with probability of flipping bits 0.25ε and the eavesdropper's channel is a binary erasure channel with probability of erasure 1-ε. Using the coding method and properties of quantum LDPC codes CSS(C1, C2) for secure communication across the Wire-tap channel in the BB84 protocol is an equivalent proof of the security of BB84 protocol. Finally, the tolerable error rate of the BB84 protocol based on quantum LDPC codes can be obtained by calculating the secrecy capacity of this special Wire-tap channel.

Key words: information security, quantum key distribution protocol, quantum LDPC codes, Wire-tap channel


  • TN918.1