A Continuous Variable Quantum Key Distribution Protocol Based on Entanglement Swapping of Quasi-Bell Entangled Coherent States

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• 作者：Li Dong (1) (2)
  Jun-Xi Wang (1)
  Xiao-Ming Xiu (1) (2) (3)
  Dan Li (3)
  Ya-Jun Gao (1)
  X. X. Yi (2)
  
• 关键词：Continuous variable quantum key distribution ; Entanglement swapping ; Quasi ; Bell entangled coherent state
• 刊名：International Journal of Theoretical Physics
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：53
• 期：9
• 页码：3173-3190
• 全文大小：1,725 KB
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• 作者单位：Li Dong (1) (2)
  Jun-Xi Wang (1)
  Xiao-Ming Xiu (1) (2) (3)
  Dan Li (3)
  Ya-Jun Gao (1)
  X. X. Yi (2)
  
  1. Department of Physics, College of Mathematics and Physics, Bohai University, Jinzhou, 121013, Peoples Republic of China
  2. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, Peoples Republic of China
  3. Department of Electrical and Electronics Engineering, Chengdu Technological University, Chengdu, 611730, Peoples Republic of China
  
• ISSN：1572-9575

文摘

A continuous variable quantum key distribution protocol with entanglement swapping of quasi-Bell entangled coherent states is proposed. As the preliminary step, a sender shares quasi-Bell entangled coherent states with a receiver. After their measurements to distinguish the cases of a zero response, a nonzero even-photon response and an odd-photon response, two legitimate participants fulfill the task of key distribution. The correlations resulting from entanglement swapping of quasi-Bell entangled coherent states and the order rearrangement of transmitted states provide the possibility to protect secret key distribution. In the ideal channel, the success probability increases with the amplitude of the coherent state, and approaches unity when the amplitude of the coherent state is larger than two. However, in the loss channel, the decoherence will introduce error in the generated key, and the error rate increases with the amplitude of the coherent state. When the amplitude of the coherent state is smaller than 0.2 (or so), the error rate approaches zero, although the success probability is less than 0.5 in this case.