Controlling quantum discord dynamics in cavity QED systems by applying a classical driving field with phase decoherence  

作　　者：钱懿 许晶波 

机构地区：[1]Institute of Modern Physics and Physics Department,Zhejiang University

出　　处：《Chinese Physics B》2012年第3期56-62,共7页中国物理B（英文版）

基　　金：Project supported by National Natural Science Foundation of China (Grant No. 10774143)

摘　　要：We investigate a two=level atom interacting with a quantized cavity field and a classical driving field in the presence of phase decoherence and find that a stationary quantum discord can arise in the interaction of the atom and cavity field as the time turns to infinity. We also find that the stationary quantum discord can be increased by applying a classical driving field. Furthermore, we explore the quantum discord dynamics of two identical non=interacting two-level atoms independently interacting with a quantized cavity field and a classical driving field in the presence of phase decoherence. Results show that the quantum discord between two atoms is more robust than entanglement under phase decoherence and the classical driving field can help to improve the amount of quantum discord of the two atoms.We investigate a two=level atom interacting with a quantized cavity field and a classical driving field in the presence of phase decoherence and find that a stationary quantum discord can arise in the interaction of the atom and cavity field as the time turns to infinity. We also find that the stationary quantum discord can be increased by applying a classical driving field. Furthermore, we explore the quantum discord dynamics of two identical non=interacting two-level atoms independently interacting with a quantized cavity field and a classical driving field in the presence of phase decoherence. Results show that the quantum discord between two atoms is more robust than entanglement under phase decoherence and the classical driving field can help to improve the amount of quantum discord of the two atoms.

关 键 词：stationary quantum discord classical driving field phase decoherence 

分 类 号：O431.2[机械工程—光学工程] O413.1[理学—光学]