Participant attack on quantum secret sharing based on entanglement swapping  

作　　者：宋婷婷 张劼 高飞 温巧燕 朱甫臣 

机构地区：[1]State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications [2]State Key Laboratory of Integrated Services Network, Xidian University [3]School of Science, Beijing University of Posts and Telecommunications [4]National Laboratory for Modern Communications

出　　处：《Chinese Physics B》2009年第4期1333-1337,共5页中国物理B（英文版）

基　　金：Project supported by the National High Technology Research and Development Program of China (Grant No 2006AA01Z419);the Major Research Plan of the National Natural Science Foundation of China (Grant Nos 90604023, 60873191 and 60821001);the National Laboratory for Modern Communications Science Foundation of China (Grant No 9140C1101010601);the Natural Science Foundation of Beijing, China (Grant No 4072020);the Integrated Service Network Open Foundation

摘　　要：The security of quantum secret sharing based on entanglement swapping is revisited and a participant attack is presented. In this attack two dishonest agents together can illegally recover the secret quantum state without the help of any other controller, and it will not be detected by any other users. Furthermore, by modifying the distribution process of particles and adding a detection step after each distribution process, we propose an improved protocol which can resist this kind of attack.The security of quantum secret sharing based on entanglement swapping is revisited and a participant attack is presented. In this attack two dishonest agents together can illegally recover the secret quantum state without the help of any other controller, and it will not be detected by any other users. Furthermore, by modifying the distribution process of particles and adding a detection step after each distribution process, we propose an improved protocol which can resist this kind of attack.

关 键 词：quantum secret sharing entanglement swapping the Bell measurement two-particleentangled state 

分 类 号：O413[理学—理论物理] TN918.1[理学—物理]