Security analysis of continuous-variable quantum key distribution scheme  

作　　者：朱俊 何广强 曾贵华 

机构地区：[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

出　　处：《Chinese Physics B》2007年第5期1364-1369,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （Grant No 60472018）.

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 △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 bearn splitter attack strategy with a proper squeeze parameter.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 △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 bearn splitter attack strategy with a proper squeeze parameter.

关 键 词：continuous variable EPR entanglement pairs quantum key distribution Shannon information theory security analysis 

分 类 号：O413[理学—理论物理] O236[理学—物理]