Security of quantum key distribution using two-mode squeezed states against optimal beam splitter attack  

作　　者：何广强 朱思维 郭红斌 曾贵华 

机构地区：[1]The State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication Systems,Department of Electronic Engineering,Shanghai Jiaotong University

出　　处：《Chinese Physics B》2008年第4期1263-1268,共6页中国物理B（英文版）

基　　金：Project supported by the Shanghai Jiaotong University (SJTU) Young Teacher Foundation,China (Grant No A2831B);the SJTU Participating in Research Projects (PRPs),China (Grant No T03011030);the National Natural Science Foundation of China(Grant No 60472018)

摘　　要：For the beam splitter attack strategy against quantum key distribution using two-mode squeezed states, the analytical expression of the optimal beam splitter parameter is provided in this paper by applying the Shannon information theory. The theoretical secret information rate after error correction and privacy amplification is given in terms of the squeezed parameter and channel parameters. The results show that the two-mode squeezed state quantum key distribution is secure against an optimal beam splitter attack.For the beam splitter attack strategy against quantum key distribution using two-mode squeezed states, the analytical expression of the optimal beam splitter parameter is provided in this paper by applying the Shannon information theory. The theoretical secret information rate after error correction and privacy amplification is given in terms of the squeezed parameter and channel parameters. The results show that the two-mode squeezed state quantum key distribution is secure against an optimal beam splitter attack.

关 键 词：quantum key distribution two-mode squeezed states optimal beam splitter attack 

分 类 号：O431.2[机械工程—光学工程] TN918[理学—光学]