Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (1): 10305-010305.doi: 10.1088/1674-1056/22/1/010305

• GENERAL • 上一篇    下一篇

New protocols for non-orthogonal quantum key distribution

周媛媛, 周学军, 田培根, 王瑛剑   

  1. School of Electronic Engineering, Naval University of Engineering, Wuhan 430033, China
  • 收稿日期:2012-06-01 修回日期:2012-07-09 出版日期:2012-12-01 发布日期:2012-12-01
  • 基金资助:
    Project supported by the National High Technology Research and Development Program of China (Grant No. 2011AA7014061) and the Science Foundation of Naval University of Engineering, China (Grant No. HGDQNJJ11022).

New protocols for non-orthogonal quantum key distribution

Zhou Yuan-Yuan (周媛媛), Zhou Xue-Jun (周学军), Tian Pei-Gen (田培根), Wang Ying-Jian (王瑛剑)   

  1. School of Electronic Engineering, Naval University of Engineering, Wuhan 430033, China
  • Received:2012-06-01 Revised:2012-07-09 Online:2012-12-01 Published:2012-12-01
  • Contact: Zhou Yuan-Yuan E-mail:zyy_hjgc@yahoo.com.cn
  • Supported by:
    Project supported by the National High Technology Research and Development Program of China (Grant No. 2011AA7014061) and the Science Foundation of Naval University of Engineering, China (Grant No. HGDQNJJ11022).

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摘要： Combining passive decoy-state idea with active decoy-state idea, a non-orthogonal (SARG04) decoy-state protocol with one vacuum and two weak decoy states is introduced based on a heralded pair coherent state photon source for quantum key distribution. Two special cases of this protocol are deduced, i.e., one-vacuum-and-one-weak-decoy-state protocol and one-weak-decoy-state protocol. In these protocols, the sender prepares decoy states actively, which avoids the crude estimation of parameters in SARG04 passive decoy-state method. With passive decoy-state idea, the detection events on Bob's side that are non-triggered on Alice's side are not discarded, but used to estimate the fractions of single-photon and two-photon pulses, which offsets the limitation of the detector's low efficiency and overcomes the shortcoming that the performance of active decoy-state protocol severely depends on detector's efficiency of sender. The simulation results show that the combination of active and passive decoy-state idea increases the key generation rate. With one-vacuum-and-two-weak-decoy-state protocol, one can achieve a key generation rate that is close to the theoretical limit of an infinite decoy-state protocol. The performance of the other two protocols is a little less than with the former, but the implementation is easier. Under the same condition of implementation, higher key rates can be obtained with our protocols than with existing methods.

关键词: quantum key distribution, non-orthogonal encoding protocol, active decoy state, passive decoy state

Abstract: Combining passive decoy-state idea with active decoy-state idea, a non-orthogonal (SARG04) decoy-state protocol with one vacuum and two weak decoy states is introduced based on a heralded pair coherent state photon source for quantum key distribution. Two special cases of this protocol are deduced, i.e., one-vacuum-and-one-weak-decoy-state protocol and one-weak-decoy-state protocol. In these protocols, the sender prepares decoy states actively, which avoids the crude estimation of parameters in SARG04 passive decoy-state method. With passive decoy-state idea, the detection events on Bob's side that are non-triggered on Alice's side are not discarded, but used to estimate the fractions of single-photon and two-photon pulses, which offsets the limitation of the detector's low efficiency and overcomes the shortcoming that the performance of active decoy-state protocol severely depends on detector's efficiency of sender. The simulation results show that the combination of active and passive decoy-state idea increases the key generation rate. With one-vacuum-and-two-weak-decoy-state protocol, one can achieve a key generation rate that is close to the theoretical limit of an infinite decoy-state protocol. The performance of the other two protocols is a little less than with the former, but the implementation is easier. Under the same condition of implementation, higher key rates can be obtained with our protocols than with existing methods.

Key words: quantum key distribution, non-orthogonal encoding protocol, active decoy state, passive decoy state

中图分类号:  (Quantum cryptography and communication security)

  • 03.67.Dd
03.67.Hk (Quantum communication)