摘要
针对单模光场相互下光场-原子相互作用对系统量子产生纠缠问题,提出单模光场相互作用系统量子场熵演化特性研究。结合原子间偶极-偶极相互作用,在旋波下近似得出二能级原子与单模光场相互作用系统的哈密顿量,分析不同时刻EPR纠缠态。通过量子场熵的数值计算,得出场熵与参数间关系并获取光场熵动态演化行为。实验结果表明:原子运动导致场熵的周期性演化,随着相干态振幅参数的增大,原子与光场的纠缠度逐渐减小,而随着压缩参数的增大,纠缠度逐渐增大;原子速度或场模结构参数的增加,导致场熵的演化周期缩短,场与原子的纠缠度逐渐减小。
In order to solve the quantum entanglement problem caused by the interaction between light field and atom in a single mode optical field,the entropy evolution characteristics of the quantum field in a single mode optical field interaction system are studied.Combined with the interatomic dipole-dipole interaction,the Hamiltonian of the two-level atom interacting system with a single mode light field under the rotary wave is approximately obtained,and the EPR entangled states at different times are analyzed.Through the numerical calculation of quantum field entropy,the relationship between field entropy and parameters is obtained and the dynamic evolution behavior of light field en-tropy is obtained.The experimental results show that the atomic motion leads to the periodic evolution of field entropy,and the entanglement of atoms and light field decreases with the increase of coherent state amplitude parameters,while the entanglement increases with the increase of compression parameters.With the increase of atomic velocity or struc-tural parameters of field mode,the evolution period of field entropy is shortened and the degree of entanglement be-tween the field and the atom is reduced gradually.
作者
舒鹏丽
高平
孙燕芬
SHU Pengli;GAO Ping;SUN Yanfen(Department of Physics,Lvliang University,Lvliang Shanxi 033000,China)
出处
《激光杂志》
CAS
北大核心
2021年第8期28-32,共5页
Laser Journal
基金
山西省高等学校科技创新项目(No.2020L0694)。
关键词
单模光场
哈密顿量
量子场熵
原子运动
压缩参数
single mode light field
hamiltonian
quantum field entropy
atomic motion
squeezing parameter
