We introduce a quantum scheme where a single five-level atom interacts with a single-mode cavity field by a time-dependent coupling. During the interaction, the temporal behavior of the quantum entropy in the atomic basis is compared with that of the Mandel parameter used to quantify the nonclassical properties of the field. With the field prepared in a squeezed coherent state, the atomic quantum entropy is then used to quantify the entanglement or the nonlocal correlation of the five-level atom (5 LA) – field system. The influence of one- and two-photon transitions and the atomic motion on the degree of entanglement and the Pancharatnam phase is analyzed. The analysis emphasizes that both the time dependence and photon multiplicity play an important role in the evolution of the degree of entanglement, the Pancharatnam phase, and nonclassical properties. This insight may be very useful in various applications in quantum physics and quantum optics.

我们介绍了一种量子方案，其中单个五能级原子通过依赖时间的耦合与单模腔场相互作用。在相互作用期间，将以原子为基础的量子熵的时间行为与用于量化场的非经典性质的Mandel参数的时间行为进行比较。当场处于压缩相干态时，然后使用原子量子熵来量化五能级原子（5 LA）–场系统的纠缠或非局部相关性。分析了单光子跃迁和双光子跃迁以及原子运动对纠缠度和Pancharatnam相的影响。分析强调，时间依赖性和光子多重性在纠缠度Pancharatnam相的演化中起着重要作用，和非经典属性。这种见解在量子物理学和量子光学的各种应用中可能非常有用。