高斯型耦合多光子跃迁J-C模型中的量子纠缠特性  

Entanglement Properties of the System in J-C Model with Multi-Photon Gaussian Coupling

作　　者：李红星[1] 萨楚尔夫[1,2] 冯川[1] 张彩花[2] 

机构地区：[1]内蒙古师范大学物理与电子信息学院 [2]内蒙古师范大学图书馆,内蒙古呼和浩特010022

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2013年第3期284-290,共7页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：内蒙古自然科学基金资助项目(2013MS0115);内蒙古师范大学"十百千"人才工程基金项目

摘　　要：利用负熵方法,研究了高斯型耦合多光子跃迁过程中的系统量子纠缠特性,讨论了原子初态、原子运动速度、失谐量、相干场平均光子数、跃迁光子数等物理参量对系统纠缠度的影响.结果表明:考虑原子运动时,系统纠缠度在整个时域范围呈现振荡-平稳-振荡的变化形式;系统的纠缠度与原子初始混合程度有关,原子初态趋于纯态时系统纠缠度较高;随着相干场平均光子数的增大,系统纠缠度的峰值逐渐变小,取稳定值的时域几乎不变;随着跃迁光子数的增大,系统纠缠度的峰值逐渐变大,取稳定值的时域逐渐缩短;随着失谐量的增大,系统在整个时域呈现纠缠现象的范围逐渐缩小.Using the negative entropy method, the quantum entanglement character of the system in J-C model with multi-photon gaussian coupling is studied. The influences of the atomic initial state, the atomic motion, the detuning, the average photon number of the light field and the transition photon number on the entanglement character of the system are discussed. The result shows that the value of the entangle-ment degree of the system changes in the form of oscillation-stability-oscillation when the atomic motion is considered. The atomic initial state affects the entanglement degree of the system. When the atomic initial state tends to pure state, the entanglement degree of the system is larger relatively. With the increase of the average photon number,the value of the entanglement degree of the system becomes smaller,but the peri-od for the stable value in the time domain is almost unchanged. Increasing the transition photon number, the value of the entanglement degree of the system becomes larger, the period for the stable value in the time domain becomes shorter. As the detuning value increases,the entanglement is disappearing gradually.

关 键 词：多光子跃迁 高斯型耦合 量子纠缠 纠缠度 混合态 

分 类 号：O431.2[机械工程—光学工程]