利用全量子理论，研究了单模Pólya 态光场与两个二能级原子之间相互作用系统的粒子布局数反转、第一个原子的线性熵和信息熵随时间的演化,讨论了原子的初态、光场的参数等物理量对系统的粒子布局数反转、线性熵和信息熵压缩的影响。结果表明：原子处于不同的初态，系统表现出完全不同量子特性；原子处于基态或激发态时，粒子布局数反转振幅比其他态大；随着场参数r 的增大，粒子布局数反转的崩塌-复原现象消失；r 的增大也会破坏信息熵在一定时域内的压缩效应；光场参数η 的增加使得振荡的周期、振幅发生变化；选取适当的原子初态、光场参数，可使系统的量子特性更加显著。

The atomic inversion and linear entropy and entropy squeezing in a system of two two- level atoms interacting with a single mode light field at Pólya state are studied by means of full quantum theory. The influences of the initial state of atoms and different parameters of the light field on the atomic inversion, linear entropy and entropy squeezing are discussed. The results show that quantum properties of the system in different initial states exhibit the completely different phenomenon. As atom is on ground state or excited state, the amplitude of atomic inversion is larger than that in other state. With the increase of the field parameter r , the collapse-recovery of the atomic inversion can be eliminated and the entropy squeezing effect can be destroyed in a certain period of time. When the value of parameter η increases, the period and the amplitude of the oscillation will change with the field parameter. The quantum properties of the system can be more prominent for the appropriate initial state and the light field parameters.