Atomic dipole square squeezing effects of a cascade three-level atom that is initially put in a vacuum dissipative cavity are investigated by means of exactly solving the master equation of the matrix elements of the density operator. Suppose that the atom is initially in a superposition of the most excited and ground states. Also, the resonant interaction is assumed. The dipole amplitude-squared squeezing effects in the process of interaction can be found. The squeezing quantities vary periodically in an ideal cavity, and field dissipation reduces the a-mount of amplitude-squared squeezing markedly in a lossy cavity.%通过严格解主方程求出耗散腔中级联三能级原子密度矩阵,研究了初始处于真空耗散场中三能级原子偶极平方压缩效应.假设原子初始处于基态与最高激发态的相干叠加态,并在共振相互作用条件下,系统在演化过程中可以出现原子偶极平方压缩现象.结果表明,理想腔条件下压缩量呈现周期性变化,当存在耗散项时,腔耗对原子的压缩效应有显著削弱作用.
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