T-C模型中运动原子与二项式光场互作用的量子纠缠

Quantum entanglement of the binomial field interacting with the moving atoms in tavis-cummings model

利用全量子理论,研究了T-C模型中运动双原子与二项式光场相互作用的场熵演化特性,讨论了不同初始状态下原子的运动速度、二项式光场系数对场熵的影响。结果表明:二项式光场系数影响着光场与原子的纠缠程度,随着二项式光场系数的增加,光场与原子的纠缠程度先增强后减弱;并得出光场处于中间态时,光场与原子纠缠可达最大。原子的运动速度影响光场与原子的纠缠程度和场熵演化的周期,随着原子运动速度增加,光场与原子的纠缠程度减弱,场熵演化的周期明显减小。因此,使二项式光场处于中间态,并选择较小的原子运动速度时,二项式光场与原子可以保持更高程度和更长时间的纠缠。

The field entropy evolution of two moving atoms interacting with the binomial field in Tavis-Cummings model is studied by means of the quantum theory. The influences of atomic motion and the parameters of the binomial optical field under different initial states are discussed emphatically. With the increase of the parameters of the binomial optical field, the entanglement degree between field and atoms is strengthened firstly and is weakened later. When the fidd is in the middle states,And as the speed of the moving atoms increases,the atom-field system will stay in the maximum entangled state, the entanglement degree between the field and atoms is weaken and the periodicity of the evolution of the field entropy decreased. When the field is in the middle states and the atoms is at the lower speed, the entanglement between the binomial field and the two atoms can be kept for much longer time.