双光子Jaynes-Cummings模型中运动原子与光场的纠缠特性

The entangled properties of motorial atom and cavity field in two-photon JaynesCummings model

用量子信息理论研究具有原子运动的双光子Jaynes-Cummings模型中运动原子与光场的纠缠特性。结果表明:当运动原子的场模结构参数p取值较小时,系统的纠缠度不具有周期振荡特性,在p取值较大时,系统的纠缠度有明显的周期振荡特性,且振荡周期是原子静止情况下的2倍;在运动原子处于基态或激发态时,系统处于消纠缠状态,当运动原子处在相干叠加态时,原子才与场发生纠缠。

The entangled properties of motofial atom and field in the two - photon Jaynes - Cummings model with atomic motion are studied by using the quantum information theory. It is shown that： （ 1 ） When the parameter p of the field model structure with atomic motion is smaller, the entanglement of system is not provided with the characteristic of periodic oscillations, when the value of p is greater, the entanglement of system is obviously provided with the characteristic of periodic oscillations,the oscillation period is as much again as atom is resting. When motorial atom is prepared in ground state or excited state ,the system is in the disentangled state; when motofial atom is prepared in coherent superpositions states,the entanglement occurs between mototial atom and field.