Entanglement properties of GHZ and W superposition state and its decayed states  

作　　者：Xin-Feng Jin Li-Zhen Jiang Xiao-Yu Chen 金鑫锋;蒋丽珍;陈小余(College of Information and Electronic Engineering,Zhejiang Gongshang University,Hangzhou 310018,China)

机构地区：[1]College of Information and Electronic Engineering,Zhejiang Gongshang University,Hangzhou 310018,China

出　　处：《Chinese Physics B》2021年第6期106-110,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 61871347)。

摘　　要：We use the generalized Wootters formula, the positive partial transpose(PPT) criterion and the matched entanglement witness, to detect entanglement of three-qubit GHZ and W superposition state and its decayed states. It shows that the results of the generalized Wootters formula in the part near the W state are tight. In the other parts, the PPT criterion is superior to the generalized Wootters formula. Furthermore, we investigate the relationship between entanglement and coherence.

关 键 词：quantum entanglement Wootters formula matched entanglement witness COHERENCE 

分 类 号：O413[理学—理论物理]