大学物理 ›› 2017, Vol. 36 ›› Issue (9): 69-72.doi: 10. 16854 /j. cnki. 1000-0712. 2017. 09. 016

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量子Discord 简介及其在特定系统中的计算

李凯,刘易,朱钦圣,吴昊,吴明和,滕保华   

  1. 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
  • 收稿日期:2016-02-22 修回日期:2017-03-02 出版日期:2017-09-20 发布日期:2017-09-20
  • 作者简介:李凯(1992—)男,安徽淮北人,电子科技大学英才实验学院2012 级本科生.
  • 基金资助:
     

Introduction of quantum discord and its calculation in a certain system

LI Kai1,LIU Yi1,ZHU Qin-sheng2,WU Hao2,WU Ming-he2,TENG Bao-hua2   

  1. 1. Yingcai Experimental School,University of Electronic Science and Technology of China,Chengdu,Sichuan 611731,China;   2. School of Physical Electronics,University of Electronic Science and Technology of China,Chengdu,Sichuan 610054,China
  • Received:2016-02-22 Revised:2017-03-02 Online:2017-09-20 Published:2017-09-20
  • Supported by:
     

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.

关键词: 量子Discord, 量子关联, 密度矩阵, 横场Ising 系统

Abstract: 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.

Key words: quantum discord, quantum correlation, density matrix, transverse field Ising system