Genuine Einstein-Podolsky-Rosen steering of generalized three-qubit states via unsharp measurements  

作　　者：陈玉玉 郭奋卓 魏士慧 温巧燕 Yuyu Chen;Fenzhuo Guo;Shihui Wei;Qiaoyan Wen(School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China;Henan Key Laboratory of Network Cryptography Technology,Zhengzhou 450001,China;State Key Laboratory of Networking and Switching Technology,Beijing University of Posts and Telecommunications,Beijing 100876,China;CETC Cyberspace Security Technology Co.,Ltd.,Beijing 100041,China)

机构地区：[1]School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China [2]Henan Key Laboratory of Network Cryptography Technology,Zhengzhou 450001,China [3]State Key Laboratory of Networking and Switching Technology,Beijing University of Posts and Telecommunications,Beijing 100876,China [4]CETC Cyberspace Security Technology Co.,Ltd.,Beijing 100041,China

出　　处：《Chinese Physics B》2023年第4期215-225,共11页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.62171056 and 61973021);Henan Key Laboratory of Network Cryptography Technology(Grant No.LNCT2022-A03)。

摘　　要：We aim to explore all possible scenarios of(1→2)(where one wing is untrusted and the others two wings are trusted)and(2→1)(where two wings are untrusted,and one wing is trusted)genuine tripartite Einstein-Podolsky-Rosen(EPR)steering.The generalized Greenberger-Horne-Zeilinger(GHZ)state is shared between three spatially separated parties,Alice,Bob and Charlie.In both(1→2)and(2→1),we discuss the untrusted party and trusted party performing a sequence of unsharp measurements,respectively.For each scenario,we deduce an upper bound on the number of sequential observers who can demonstrate genuine EPR steering through the quantum violation of tripartite steering inequality.The results show that the maximum number of observers for the generalized GHZ states can be the same with that of the maximally GHZ state in a certain range of state parameters.Moreover,both the sharpness parameters range and the state parameters range in the scenario of(1→2)steering are larger than those in the scenario of(2→1)steering.

关 键 词：quantum information quantum steering generalized Greenberger-Horne-Zeilinger(GHZ)state 

分 类 号：O413[理学—理论物理]