阻尼Jaynes-Cummings模型下两原子与双模真空态光场相互作用系统中量子态的保真度

The Fidelity of Quantum State in A System Interacting Two Atoms with Two-Mode Vacuum Field in a Damping Jaynes-Cummings Model

利用数值计算的方法,在阻尼Jaynes-Cummings(J-C)模型下,研究两原子与双模真空态光场相互作用系统中量子态的保真度,分析了原子的初始状态、跃迁频率、腔场频率、耗散阻尼系数等参量对系统中量子态保真度的影响.结果表明,无耗散阻尼时,保真度在整个区间出现规则的周期振荡,但随着耗散阻尼的增加,量子态保真度振荡的幅度越来越小,最后达到一个稳定值.

The fidelity of quantum state in a system which two atoms interacting with two mode vacuum state light field in a damping Jaynes-Cummings model is studied by means of the numerical method.The influences of the parameters such as the initial state of atoms,transition frequency,the frequency of the cavity field,dissipative damping parameters on the fidelity of quantum states in the system are analyzed.The results show that in the case of no damping dissipation,fidelity appears regular periodic oscillation in the whole interval.With the increase of dissipative damping,the oscillating amplitude of the fidelity of quantum state becomes smaller,and is at a steady value finally.