V型三能级原子与双模奇偶纠缠相干光场相互作用的量子态保真度  

Fidelity of quantum states for V-type three-level atom interacting with the two-mode odd-even entangled coherent field

作　　者：邹艳[1,2] 

机构地区：[1]德州学院物理系,山东德州253023 [2]山东省高校生物物理重点实验室,山东德州253023

出　　处：《量子电子学报》2009年第3期320-326,共7页Chinese Journal of Quantum Electronics

基　　金：德州学院科研基金(07024)

摘　　要：研究了Ⅴ型三能级原子与双模奇偶纠缠相干光场相互作用系统的量子态保真度,运用数值计算的方法讨论了失谐量、双模光场的强度和原子分布角对量子信息保真度的影响。结果表明:原子的量子态保真度优于系统的或光场的量子态保真度,原子初始处于基态时,原子的保真度好于激发态或叠加态的情况;原子的保真度随着失谐量或双模光场强度的增大而增大;系统的和光场的保真度时间演化特性是相似的。失谐量、双模光场的强度和原子的分布角都对量子态保真度的时间演化曲线的频率有影响。The evolution characteristics of the fidelity of quantum states for a v-type three-level atom interacting with the two-mode odd-even entangled coherent field are investigated. The influences of the detuning parameter, the two-mode light field intensity and the atomic distribution angle on the fidelity of quantum states are discussed by using numerical calculation. The results show that the nature of fidelity for the atom is better than that for the system and the field, the increasing of the detuning parameter or the initial field intensity can be a good help for increasing of the fidelity of the atom, and it is much better when the atom is initially in the ground state. The evoIution frequencies of the fidelities are modulated by the detuning param.eter. The quantum collapse and revival behaviors occur when the two-mode light field intensity is strong enough.

关 键 词：量子光学 量子态保真度 V型三能级原子 双模奇偶纠缠相干光场 

分 类 号：O431.2[机械工程—光学工程]