多光子过程中相位退相干时两原子布居数反转

摘要

By means of the quantum theory, the population inversion of two atoms in the system of two two-level atoms coupled to a light field in the Binomial Optical Field are investigated in the presence of phase decoherence in the multiphoton Tavis - Cumming Model. The influences of the phase decoherence coefficient, the parameters j^of the binomial optical field, the maximum number of photons and the number of the transitional photons on the properties of the population inversion of two atoms have been discussed. The results show that the phase decoherence reduced the oscillation amplitude of the population inversion of two atoms and destroyed the atomic quantum characteristic. Changing the number of the transitional photons, evolved cycle and evolved intensity the population inversion of two atoms can be changed. The phenomena of collapse and revival disappear as photon number increase. When the binomial optical state changes from a coherent state to a Fock state, the oscillation frequency of the atomic population reduces gradually, the phenomena of collapse and revival vanishes gradually.%利用全量子理论的方法,研究了存在相位退相干时多光子T-C模型中两个二能级原子与二项式光场相互作用系统中两原子的布居数反转.讨论了相位退相干系数、二项式光场系数、最大光子数、跃迁光子数对原子布居数反转的影响.结果表明:相位退相干减少了原子布居数反转的振幅、破坏了原子的量子特性.改变跃迁光子教,可以改变原子间布居数反转演化周期及演化强度.当二项式光场的最大先子数增大时,原子布居差的崩塌-回复现象就会逐渐消失.相位退相干因子不变时,二项式先场从相干态过渡到数态过程中,原子布居的振荡频率由大变小,周期性的崩塌与回复现象逐渐消失.