中国物理B ›› 2015, Vol. 24 ›› Issue (8): 80305-080305.doi: 10.1088/1674-1056/24/8/080305

• GENERAL • 上一篇    下一篇

An optimized encoding method for secure key distribution by swapping quantum entanglement and its extension

高干   

  1. Department of Electrical Engineering, Tongling University, Tongling 244000, China
  • 收稿日期:2014-12-30 修回日期:2015-02-15 出版日期:2015-08-05 发布日期:2015-08-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11205115), the Program for Academic Leader Reserve Candidates in Tongling University (Grant No. 2014tlxyxs30), and the 2014-year Program for Excellent Youth Talents in University of Anhui Province, China.

An optimized encoding method for secure key distribution by swapping quantum entanglement and its extension

Gao Gan (高干)   

  1. Department of Electrical Engineering, Tongling University, Tongling 244000, China
  • Received:2014-12-30 Revised:2015-02-15 Online:2015-08-05 Published:2015-08-05
  • Contact: Gao Gan E-mail:gaogan0556@163.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11205115), the Program for Academic Leader Reserve Candidates in Tongling University (Grant No. 2014tlxyxs30), and the 2014-year Program for Excellent Youth Talents in University of Anhui Province, China.

摘要:

Song [Song D 2004 Phys. Rev. A 69 034301] first proposed two key distribution schemes with the symmetry feature. We find that, in the schemes, the private channels which Alice and Bob publicly announce the initial Bell state or the measurement result through are not needed in discovering keys, and Song's encoding methods do not arrive at the optimization. Here, an optimized encoding method is given so that the efficiencies of Song's schemes are improved by 7/3 times. Interestingly, this optimized encoding method can be extended to the key distribution scheme composed of generalized Bell states.

关键词: quantum key distribution, optimized encoding method, entanglement swapping, generalized Bell states

Abstract:

Song [Song D 2004 Phys. Rev. A 69 034301] first proposed two key distribution schemes with the symmetry feature. We find that, in the schemes, the private channels which Alice and Bob publicly announce the initial Bell state or the measurement result through are not needed in discovering keys, and Song's encoding methods do not arrive at the optimization. Here, an optimized encoding method is given so that the efficiencies of Song's schemes are improved by 7/3 times. Interestingly, this optimized encoding method can be extended to the key distribution scheme composed of generalized Bell states.

Key words: quantum key distribution, optimized encoding method, entanglement swapping, generalized Bell states

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

  • 03.67.Dd
03.67.Hk (Quantum communication) 03.67.-a (Quantum information)