无限对序列观测者的双边纠缠目击  

Entanglement witnessing by arbitrarily many pairs of sequential observers

作　　者：王静 郭奋卓[1,2,3] 贾燕宁[1,2,3] WANG Jing;GUO FenZhuo;JIA YanNing(School of Secience,Beijing University of Posts and Telecommunications,Beijing 100876,China;Henan Key Laboratory of Network Cryptography Technology,Zhengzhou 450001,China;Laboratory of Mathematics and Information Networks(Beijing University of Posts and Telecommunications),Ministry of Education,Beijing 100876,China)

机构地区：[1]北京邮电大学理学院,北京100876 [2]河南省网络密码技术重点实验室,郑州450001 [3]北京邮电大学数学与信息网络教育部重点实验室,北京100876

出　　处：《中国科学：物理学、力学、天文学》2024年第6期159-165,共7页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:62171056,61973021);河南省网络密码技术重点实验室研究课题(编号:LNCT2022-A03)资助项目。

摘　　要：本文研究带噪声的两量子比特纠缠态的双边序列纠缠检测问题.根据目击算子和测量策略找到了一类可以实现无限对Alice和Bob共享纠缠的态.本文给出了这类态能够实现无限对Alice和Bob共享纠缠的具体证明过程,并对作为这类态的特例的两量子比特最大纠缠态、一般纠缠纯态以及Werner态进行了具体的图例分析.实现带噪声的两体系统纠缠态族的任意对观测者的双边纠缠共享在多用户场景和量子网络中有重要意义.A bilateral sequential entanglement detection problem is examined for 2-qubit entangled states with noise.A class of states that can realize infinite pairs of Alice and Bob sharing entanglement is found based on entanglement witnesses and measurement strategy.Concrete proof is given for the entanglement of states that can be shared by arbitrary Alice-Bob pairs.The 2-qubit maximally entangled state,general entangled pure states,and Werner state,which are special scenarios of such states,are also investigated using specific illustrations.Achieving bilateral entanglement sharing for arbitrary pairs of observers of a bipartite system with noise has important implications in multilateral multiuser scenarios and quantum networks.

关 键 词：量子密码 纠缠共享 序列测 纠缠目击 

分 类 号：O413[理学—理论物理]