Correlation dynamics of a qubit qutrit system in a spin-chain environment with Dzyaloshinsky Moriya interaction  

作　　者：杨阳 王安民 

机构地区：[1]Department of Modern Physics,University of Science and Technology of China

出　　处：《Chinese Physics B》2014年第2期99-105,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No.10975125)

摘　　要：We study the dynamics of correlations for a hybrid qubit-qutrit system in an XY spin-chain environment with Dzyaloshinsky-Moriya interaction. Our discussion involves a comparative analysis of negativity, quantum discord, and measurement-induced disturbance. It is found that the quantum discord is optimal of the three quantum correlations to de- tect the critical point of quantum phase transition. Only when the qubit interacts with the environment, is the phenomenon of sudden transition between the classical correlation and the quantum discord observed. Moreover, the Dzyaloshinsky- Moriya interaction enhances the decay of quantum correlations.We study the dynamics of correlations for a hybrid qubit-qutrit system in an XY spin-chain environment with Dzyaloshinsky-Moriya interaction. Our discussion involves a comparative analysis of negativity, quantum discord, and measurement-induced disturbance. It is found that the quantum discord is optimal of the three quantum correlations to de- tect the critical point of quantum phase transition. Only when the qubit interacts with the environment, is the phenomenon of sudden transition between the classical correlation and the quantum discord observed. Moreover, the Dzyaloshinsky- Moriya interaction enhances the decay of quantum correlations.

关 键 词：quantum correlation quantum discord measurement-induced disturbance Dzyaloshinsky- Moriya interaction 

分 类 号：O413[理学—理论物理]