Amplifying stationary quantum discord and entanglement between a superconducting qubit and a data bus by time-dependent electromagnetic field  

作　　者：QIAN Yi ZHANG YeQi XU JingBo 

机构地区：[1]Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, Hangzhou 310027, China

出　　处：《Chinese Science Bulletin》2012年第14期1637-1642,共6页

摘　　要：We study the dynamics of quantum discord and entanglement between a superconducting qubit and a data bus,which is driven by a controllable time-dependent electromagnetic field,in the presence of phase decoherence and find that the quantum discord and entanglement remain at a stationary non-zero value for long time evolution.It is shown that the amount of stationary quantum discord and entanglement can be enhanced by applying the time-dependent electromagnetic field.We study the dynamics of quantum discord and entanglement between a superconducting qubit and a data bus, which is driven by a controllable time-dependent electromagnetic field, in the presence of phase decoherence and find that the quantum discord and entanglement remain at a stationary non-zero value for long time evolution. It is shown that the amount of stationary quantum discord and entanglement can be enhanced by applying the time-dependent electromagnetic field.

关 键 词：量子比特 时间变化 数据总线 纠缠量 电磁场 超导 时间依赖 时间演化 

分 类 号：O413.1[理学—理论物理] TP38[理学—物理]