Decay of N-qubit GHZ states in Pauli channels  

作　　者：陈小余 王婷婷 

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

出　　处：《Chinese Physics B》2015年第8期170-176,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11375152)

摘　　要：An N-qubit Greenberger–Horne–Zeilinger(GHZ) state has many applications in various quantum information tasks and can be realized in different experimental schemes. A GHZ diagonal state evolves to another GHZ diagonal state in independent parallel Pauli channels. We give the explicit expression of the resultant GHZ diagonal state in terms of the initial state and channel parameters. If the initial state is a pure N qubit GHZ state or a three-qubit GHZ diagonal state admits a condition, the full separability criterion of the Pauli noisy state is equivalent to positive partial transpose(PPT)criterion. Thus the fully separable condition follows.An N-qubit Greenberger–Horne–Zeilinger(GHZ) state has many applications in various quantum information tasks and can be realized in different experimental schemes. A GHZ diagonal state evolves to another GHZ diagonal state in independent parallel Pauli channels. We give the explicit expression of the resultant GHZ diagonal state in terms of the initial state and channel parameters. If the initial state is a pure N qubit GHZ state or a three-qubit GHZ diagonal state admits a condition, the full separability criterion of the Pauli noisy state is equivalent to positive partial transpose(PPT)criterion. Thus the fully separable condition follows.

关 键 词：full separability GHZ state Pauli noise 

分 类 号：O413.1[理学—理论物理]