Implementation of Positive Operator-Valued Measure in Passive Faraday Mirror Attack  

作　　者：王卫龙 高明 马智 

机构地区：[1]State Key Laboratory of Mathematical Engineering and Advanced Computing

出　　处：《Communications in Theoretical Physics》2015年第3期296-302,共7页理论物理通讯（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant Nos.61472446,U1204602;National High Technology Research and Development Program of China under Grant No.2011AA010803;the Open Project Program of the State Key Laboratory of Mathematical Engineering and Advanced Computing under Grant No.2013A14

摘　　要：Passive Faraday-mirror(PFM) attack is based on imperfect Faraday mirrors in practical quantum cryptography systems and a set of three-dimensional Positive Operator-Valued Measure(POVM) operators plays an important role in this attack.In this paper,we propose a simple scheme to implement the POVM in PFM attack on an FaradayMichelson quantum cryptography system.Since the POVM can not be implemented directly with previous methods,in this scheme it needs to expand the states sent by Alice and the POVM operators in the attack into four-dimensional Hilbert space first,without changing the attacking effect by calculation.Based on the methods proposed by Ahnert and Payne,the linear-optical setup for implementing the POVM operators is derived.At last,the complete setup for realizing the PFM attack is presented with all parameters.Furthermore,our scheme can also be applied to realize PFM attack on a plug-and-play system by changing the parameters in the setup.

关 键 词：Faraday mirrors passive Faraday mirror attack POVM linear optics 

分 类 号：O413[理学—理论物理] TN918.1[理学—物理]