摘要
应用全量子理论,研究了单模奇相干态光场与耦合双能级原子相互作用系统的量子场熵演化特性.通过数值计算,分析了光场初始为单模奇相干态且耦合双能级原子分别处于两种不同EPR(Einstein Poclolsky Rosen)态时光场的平均光子数n0、场与原子间相互作用耦合强度g以及原子与原子间偶极相互作用的耦合强度ga对光场量子场熵演化特性的影响.结果表明,量子场熵随时间的演化与原子的初始状态有关;在初始强场(n0 1)条件下,光场与原子纠缠与退纠缠呈现一定的周期性,且存在量子干涉现象;随着g的增大,量子场熵不规则振荡周期逐渐减小;当ga为定值时,量子场熵的时间演化呈现崩坍与回复现象.
According to the complete quantum theory, the quantum field-entropy evolution properties in a system of the two coupled two-level atoms interacting with a single-mode odd-coherent state light field are studied. Through numerical calculation the influence of the initial mean photon number no, the coupled intensity g of interaction between the single-mode field and atoms, and the coupled intensity ga of dipole-dipole interaction between the two coupled atoms on the quantum field-entropy evolving while the initial state of the light field is a single-mode odd-coherent and the two coupled two- level atoms lay in different Einstein Poclolsky Rosen（EPR） entangled state respectively. The results indicate that the time evolving of quantum field-entropy is closely related to the initial atoms state. The quantum field-entropy evolution can display the phenomena of entanglement and disentanglement while they are periodically under the condition of intensity field （n0〉〉1）. Meanwhile the phenomena of quantum interference is also discovered. The periodicity of the quantum field-entropy anomalous oscillation decreases gradually with the increasing of g values. When ga is an especial constant, it is shown that the phenomena of period collapse-reversion can present.
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第1期54-59,共6页
Journal of Shaanxi Normal University：Natural Science Edition
基金
陕西省自然科学基金资助项目(2004A19)
陕西省教育厅科研基金资助项目(2002JK191)
渭南师范学院重点科研基金资助项目(2006YKF012)
关键词
量子光学
量子信息学
单模奇相干态
耦合双能级原子
量子场熵
quantum optics
quantum inforrnatics
single-mode odd-coherent state
coupled two-level atoms
quantum field-entropy
