依赖强度与时间耦合场-原子系统中场熵演化  

Evolution of intensity-and time-dependent field quantum entropy of field-atom coupled system

作　　者：刘王云[1] 潘聪逸 杨志勇 段存丽[1] LIU Wangyun;PAN Congyi;YANG Zhiyong;DUAN Cunli(School of Optoelectronic Engineering,Xi'an Technological University,Xi'an 710021,China;School of Physics and Optoelectronic Engineering,Xi'an University,Xi'an 710071,China)

机构地区：[1]西安工业大学光电工程学院,陕西西安710021 [2]西安电子科技大学物理与光电工程学院,陕西西安710071

出　　处：《量子电子学报》2020年第2期215-221,共7页Chinese Journal of Quantum Electronics

基　　金：陕西省科技厅自然科学基础研究计划(2019JQ-316)。

摘　　要：利用Von Neumann量子约化熵理论,研究了共振情况下场与原子之间的耦合随时间和强度变化时,A型三能级原子与单模场相互作用系统中量子场熵的演化特性,通过数值计算详细讨论了不同初始光场和耦合系数变化的快慢对量子场熵的影响。结果表明:初始光场统计性质的不同将使系统的量子场熵演化发生较大变化,耦合强度调制函数的变化将改变量子场熵演化曲线的振荡频率,场与原子相互作用的初始阶段是一个逐渐耦合的过程,原子叠加态概率使量子场熵周期性地发生改变。Based on the Von Neumann quantum reduced entropy theory,the evolution properties of field quantum entropy in the interaction system of A-type three-level atom and single-model field are investigated when the coupling between the field and the atom changes with time and intensity under the on-resonance condition.The influences of the different initial fields and changes of the coupling coefficient on field quantum entropy is discussed in detail through numerical calculation.Results show that the different statistical properties of the initial fields will lead to the great variation of the field quantum entropy,and the changes of the coupling strength modulation function will change the oscillating frequency of the field quantum entropy evolution.In addition,it is shown that the initial stage of the interaction between the field and atom is a gradually coupled procedure,and the superposition state probability of the atom makes the field quantum entropy change periodically.

关 键 词：量子光学 量子场熵演化 Von Neumann量子约化熵理论 依赖强度与时间耦合 A型三能级原子 

分 类 号：O431.2[机械工程—光学工程]