中国物理B ›› 2007, Vol. 16 ›› Issue (5): 1364-1369.doi: 10.1088/1009-1963/16/5/033

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Security analysis of continuous-variable quantum key distribution scheme

朱俊, 何广强, 曾贵华   

  1. The State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication Systems,\\ Electronic Engineering Department, Shanghai Jiaotong University, Shanghai 200240, China
  • 收稿日期:2006-07-26 修回日期:2006-10-27 出版日期:2007-05-20 发布日期:2007-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60472018).

Security analysis of continuous-variable quantum key distribution scheme

Zhu Jun(朱俊)†, He Guang-Qiang(何广强), and Zeng Gui-Hua(曾贵华)   

  1. The State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication Systems, Electronic Engineering Department, Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2006-07-26 Revised:2006-10-27 Online:2007-05-20 Published:2007-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60472018).

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摘要： In this paper security of the quantum key distribution scheme using correlations of continuous variable Einstein--Podolsky--Rosen (EPR) pairs is investigated. A new approach for calculating the secret information rate Δ I is proposed by using the Shannon information theory. Employing an available parameter F which is associated with the entanglement of the EPR pairs, one can detect easily the eavesdropping. Results show that the proposed scheme is secure against individual beam splitter attack strategy with a proper squeeze parameter.

关键词: continuous variable EPR entanglement pairs, quantum key distribution, Shannon information theory, security analysis

Abstract: In this paper security of the quantum key distribution scheme using correlations of continuous variable Einstein--Podolsky--Rosen (EPR) pairs is investigated. A new approach for calculating the secret information rate $\Delta I$ is proposed by using the Shannon information theory. Employing an available parameter F which is associated with the entanglement of the EPR pairs, one can detect easily the eavesdropping. Results show that the proposed scheme is secure against individual beam splitter attack strategy with a proper squeeze parameter.

Key words: continuous variable EPR entanglement pairs, quantum key distribution, Shannon information theory, security analysis

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

  • 03.67.Dd
03.65.Ud (Entanglement and quantum nonlocality)