量子Discord简介及其在特定系统中的计算  

Introduction of quantum discord and its calculation in a certain system

作　　者：李凯 刘易 朱钦圣[2] 吴昊[2] 吴明和[2] 滕保华[2] LI Kai LIU Yi ZHU Qin-sheng WU Hao WU Ming-he TENG Bao-hua(Yingcai Experimental School, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China)

机构地区：[1]电子科技大学英才实验学院,四川成都611731 [2]电子科技大学物理电子学院,四川成都610054

出　　处：《大学物理》2017年第9期69-72,81,共5页College Physics

摘　　要：量子Discord作为一种比量子纠缠更准确地刻画系统量子关联的物理量,在量子信息理论中备受关注.本文首先简略介绍量子Discord的基本概念,然后以横场Ising系统为例,讨论了量子Discord的一种计算方法.最后根据横场Ising系统的量子Discord得到了表征其特征的三维图像,并讨论了系统中两格点间的关联特性.Quantum discord is an important concept of quantum information, which is used to evaluate quantum correlation among systems and performs more accurately than quantum entanglement. In this paper, the concept of quantum discord, its recent developments and applications are introduced. By considering the transverse field Ising system as an example, a method to calculate quantum discord is elaborated. Thereby the system＇s quantum discord is obtained and a three-dimensional image characterizing the features of quantum discord is plotted.

关 键 词：量子Discord 量子关联 密度矩阵 横场Ising系统 

分 类 号：O413.1[理学—理论物理]