单模真空场-耦合双原子系统的量子场熵演化特性  

Properties of Evolution of Quantum Field Entropy in a Single-mode Vacuum Field-Coupled Two-level Atoms′ System

作　　者：刘王云[1] 杨志勇[1] 安毓英[1] 

机构地区：[1]西安电子科技大学技术物理学院,陕西西安710071

出　　处：《光电子．激光》2007年第9期1124-1127,共4页Journal of Optoelectronics·Laser

基　　金：陕西省自然科学基金资助项目(2001SL04);陕西省科技攻关资助项目(2002K05-G9)

摘　　要：利用全量子理论,研究了单模真空场-耦合双原子系统的量子场熵的演化特性。结果发现:在这个系统中,光场的量子场熵呈现出周期性振荡的双峰及多峰结构,特别是随着原子间偶极-偶极相互作用的增强,原子-原子间的量子纠缠程度逐渐减弱;随着初态中两原子同时处于低能级几率的增大,光场量子场熵的幅值逐渐降低,特别是当两原子均处于低能级时,光场与原子间几乎长时间退纠缠;场-原子间的耦合强度对光场量子场熵的演化周期有很大影响,随着场-原子间耦合强度的增大,光场量子场熵的演化周期明显减小。The properties of quantum field entropy evolution in a single-mode vacuum field-coupled two-level atoms＇ system were by the complete quantum theory. The numerical results indicate that the quantum field entropy in the system is periodic oscillation with two peaks＇ or many peaks＇ structures;The quantum entanglement between the atoms decreases with the increase of the dipole-dipole interaction strength between them;The amplitude of the field quantum entropy decreases with the increase of the probability of the two atoms stayed simultaneously in their ground states; Especially when the two atoms both stayed in their ground states,the field and the atoms are both disentangled for a long time;The coupling strength be- tween the field and the atoms has important influences on the periodicity of the field quantum entropy,namely,the periodicity mentioned above becomes shorter with the strengther of the coupling.

关 键 词：子光学 量子场熵 量子纠缠 偶极相互作用 等同双能级原子 量子信息学 

分 类 号：O431.2[机械工程—光学工程]