中国物理B ›› 2015, Vol. 24 ›› Issue (5): 50309-050309.doi: 10.1088/1674-1056/24/5/050309

• GENERAL • 上一篇    下一篇

A long-distance quantum key distribution scheme based on pre-detection of optical pulse with auxiliary state

权东晓, 朱畅华, 刘世全, 裴昌幸   

  1. State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China
  • 收稿日期:2014-09-02 修回日期:2014-11-20 出版日期:2015-05-05 发布日期:2015-05-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61372076), the Programme of Introducing Talents of Discipline to Universities, China (Grant No. B08038), and the Fundamental Research Funds for the Central Universities, China (Grant No. K5051201021).

A long-distance quantum key distribution scheme based on pre-detection of optical pulse with auxiliary state

Quan Dong-Xiao (权东晓), Zhu Chang-Hua (朱畅华), Liu Shi-Quan (刘世全), Pei Chang-Xing (裴昌幸)   

  1. State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China
  • Received:2014-09-02 Revised:2014-11-20 Online:2015-05-05 Published:2015-05-05
  • Contact: Quan Dong-Xiao E-mail:dxquan@xidian.edu.cn
  • About author:03.67.Hk; 03.67.Dd; 03.67.Ac
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61372076), the Programme of Introducing Talents of Discipline to Universities, China (Grant No. B08038), and the Fundamental Research Funds for the Central Universities, China (Grant No. K5051201021).

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摘要： We construct a circuit based on PBS and CNOT gates, which can be used to determine whether the input pulse is empty or not according to the detection result of the auxiliary state, while the input state will not be changed. The circuit can be treated as a pre-detection device. Equipping the pre-detection device in the front of the receiver of the quantum key distribution (QKD) can reduce the influence of the dark count of the detector, hence increasing the secure communication distance significantly. Simulation results show that the secure communication distance can reach 516 km and 479 km for QKD with perfect single photon source and decoy-state QKD with weak coherent photon source, respectively.

关键词: quantum key distribution, pre-detection, secure communication distance, decoy state

Abstract: We construct a circuit based on PBS and CNOT gates, which can be used to determine whether the input pulse is empty or not according to the detection result of the auxiliary state, while the input state will not be changed. The circuit can be treated as a pre-detection device. Equipping the pre-detection device in the front of the receiver of the quantum key distribution (QKD) can reduce the influence of the dark count of the detector, hence increasing the secure communication distance significantly. Simulation results show that the secure communication distance can reach 516 km and 479 km for QKD with perfect single photon source and decoy-state QKD with weak coherent photon source, respectively.

Key words: quantum key distribution, pre-detection, secure communication distance, decoy state

中图分类号:  (Quantum communication)

  • 03.67.Hk
03.67.Dd (Quantum cryptography and communication security) 03.67.Ac (Quantum algorithms, protocols, and simulations)