运用量子熵理论,探讨了Λ型三能级原子与Pólya态光场相互作用时,光场分布参数、原子相对失谐量、最大光子数、光场概率参数和原子初态对系统量子纠缠特性的影响。结果表明:当Λ型三能级原子与Pólya态光场相互作用时,若初态为两能级等权叠加态,各参量取适当值时可得到最大纠缠度较小的、稳定的、周期性振荡的量子纠缠态,若初态为激发态或三能级等权叠加态,各参量取适当值时可得到最大纠缠度为1.1的、稳定的、周期性振荡的纠缠态。

The influences of light-field distribution parameters, atomic relative detuning, maximum photon number, light-field probability parameters, and initial atomic states on quantum entanglement characteristics of a system comprising a Pólya-state light field interacting with a Λ-type three-level atom are analyzed based on the quantum entropy theory. The results denote that when the Λ-type three-level atom interacts with the Pólya-state light field and the initial state is a two-lower-level energy-equal superposition state, a stable and periodically oscillating entangled state with a relatively small maximum entanglement degree can be obtained for appropriate parameter values. However, if the initial state is an excited state or a three-level equal-weight superposition state, a stable and periodically oscillating entangled state with a maximum entanglement degree of 1.1 can be obtained for appropriate parameter values.