利用密度矩阵方法,在相互作用表象中建立了单个二能级原子与经典电场相互作用的哈密顿算符,求解了二能级原子系统密度矩阵所满足的微分方程.结果表明,密度矩阵非对角元在任意时刻都不为零,在这种相互作用模型中,二能级原子系统能够保持较好的量子相干性.
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