Phase effect on dynamics of quantum discord modulated by interaction between qubits  

作　　者：王国友 郭有能 曾浩生 

机构地区：[1]Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Department of Physics,Hunan Normal University

出　　处：《Chinese Physics B》2015年第9期101-105,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11275064 and 11075050);the Specialized Research Fund for the Doctoral Program of Higher Education,China(Grant No.20124306110003);the Scientific Research Foundation of the Education Department of Hunan Province,China(Grant No.13C039);the Construct Program of the National Key Discipline,China

摘　　要：We study the effects of the interaction strength and the initial phase on the dynamics of quantum discord in a twoqubit system under both spontaneous emission and dephasing noisy channels. It is shown that the time evolution of quantum discord displays quicker oscillations with increasing inter-qubit interaction strength but the effect of the initial phase closely depends on the interaction between the qubits. Only for non-zero inter-qubit interaction cases, the evolution of quantum discord is affected by the initial phase and its oscillating amplitude increases with increasing initial phase. A comparison between evolutions of quantum discord and entanglement is also made.We study the effects of the interaction strength and the initial phase on the dynamics of quantum discord in a twoqubit system under both spontaneous emission and dephasing noisy channels. It is shown that the time evolution of quantum discord displays quicker oscillations with increasing inter-qubit interaction strength but the effect of the initial phase closely depends on the interaction between the qubits. Only for non-zero inter-qubit interaction cases, the evolution of quantum discord is affected by the initial phase and its oscillating amplitude increases with increasing initial phase. A comparison between evolutions of quantum discord and entanglement is also made.

关 键 词：quantum discord spontaneous emission DEPHASING 

分 类 号：O413.1[理学—理论物理]