Experimental verification of genuine multipartite entanglement without shared reference frames  

参考系无关的真多体纠缠性质实验验证(英文)

作　　者：王钊 张超 黄运锋 柳必恒 李传锋 郭光灿 

机构地区：[1]Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences [2]Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China

出　　处：《Science Bulletin》2016年第9期714-719,共6页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(61327901;61490711;11274289;11325419;61225025;11474268;and 11374288);the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(XDB01030300);the National Youth Top Talent Support Program of National High-level Personnel of Special Support Program;the Fundamental Research Funds for the Central Universities(WK2470000018)

摘　　要：Quantum entanglement is an essential resource for quantum information processing, either for quantum communication or for quantum computation. The multi- partite case of entanglement, especially the so called gen- uine multipartite entanglement, has significant importance for multipartite quantum information protocols. Thus, it is a natural requirement to experimentally verify multipartite quantum entanglement when performing many quantum int^rmation tasks. However, this is often technically chal- lenging due to the difficulty of building a shared reference lYame among all involved parties, especially when these parties are distant l^om each other. In this paper, we experimentally verify the genuine tripartite entanglement of a three-photon Greenberger-Horne-Zeilinger state without shared reference frames. A high probability 0.79 of successfully verifying the genuine tripartite entanglement is achieved when no reference frame is shared. In the case of sharing only one common axis, an even higher success probability of 0.91 is achieved.量子纠缠在量子信息、量子通信及量子计算中均是一种重要的资源.多体纠缠,尤其是真多体纠缠对于量子相对于经典信息处理的优势更具基本意义.在实现远距离量子通信或分布式量子计算等协议之前,对制备的纠缠态进行纠缠性质的实验验证是十分重要且必要的.然而,传统上使用Bell不等式验证纠缠的方法都要求得到纠缠粒子的各方在对粒子进行测量时选择共同的测量基矢组.这在大空间尺度分发纠缠态,实现量子协议的实验中,技术上是很难实现,需要耗费大量资源.本实验验证了一种类正四面体基矢组在不共享参考系的情形下,对于检测真多体纠缠时具有很高的敏感性和成功概率.在3粒子情形下,3方互相不共享任何参考方向时,成功概率可达0.79;仅共享一个参考方向时,成功概率甚至可达0.91.

关 键 词：Genuine multipartite entanglement Reference-frame independent . Mermin-Klyshkoinequality 

分 类 号：O413[理学—理论物理]