College Physics >

2017 , Vol. 36 >Issue 9: 69 - 72

DOI: https://doi.org/10. 16854 /j. cnki. 1000-0712. 2017. 09. 016

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
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  • 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 date: 2016-02-22

  Revised date: 2017-03-02

  Online published: 2017-09-20

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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

Cite this article

LI Kai1 , LIU Yi1 , ZHU Qin-sheng2 , WU Hao2 , WU Ming-he2 , TENG Bao-hua2 . Introduction of quantum discord and its calculation in a certain system[J]. College Physics, 2017 , 36(9) : 69 -72 . DOI: 10. 16854 /j. cnki. 1000-0712. 2017. 09. 016

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