Bell态原子与双模纠缠相干光场双光子相互作用的原子布居数演化特性  

Time-evolution of the Atom's Occupancy of Atoms in Bell States Interacting with the Two-mode Entangled Coherent Field via Two-photon Process

作　　者：邹艳[1] 李永平[1] 

机构地区：[1]德州学院物理系

出　　处：《量子光学学报》2008年第3期253-260,共8页Journal of Quantum Optics

基　　金：德州学院科研基金(批准号:07024)

摘　　要：运用全量子理论研究了Bell态原子与双模纠缠相干光场双光子相互作用过程中的原子粒子布居差的时间演化规律。结果表明:原子初始处于|β11>时,原子粒子布居差恒为零;原子初始处于其他三个Bell态时,随着初始光场平均光子数的增加,原子粒子数布居差时间演化曲线的振荡频率明显增大,振荡幅度明显减小;双模光场纠缠程度的大小对曲线的振荡频率及整体曲线的位置都没有影响。随着原子间偶极相互作用的增强,当原子初态处在|β01>时,曲线的Rabi振荡频率明显增大;而两原子初始处于|β10>或|β00>态时,曲线的崩塌-回复现象逐渐消失。The time-evolution of the atom＇s occupancy in the system of two-mode entangled coherent fields interacting with two atoms in Bell states via two-photon process is investigated by means of quantum theory. The results show that the atom＇s occupancy is zero if the two atoms are initially in Bell state ｜β11〉. If the two atoms are initially in the other three Bell states, the oscillation frequency of the atom＇s occupancy accelerates and the amplitude decreases apparently with the increase of mean photon numbers of field. The degree of the entanglement for the entangled coherent fields can＇t influence the oscillation frequency and the position of the atom＇s occupancy curve. If the two atoms are initially in Bell state ｜β01〉 , the Rabi oscillation frequency of the atom＇s occupancy accelerates apparently with the increase of the co atoms. While the two atoms are initially in Bell state ｜β10〉 or ｜β00〉 , atom＇s occupancy disappears gradually.

关 键 词：量子光学 BELL态 双模纠缠相干光场 原子布居差 

分 类 号：O431[机械工程—光学工程]