Influence of an External Classical Field on a ? Four-Level Atom Inside a Quantized Field

In this paper, we study the effect of detuning parameters and driven external classical field on a quantum system consisting ?-configuration four-level atom inside quantized cavity field. Under some canonical conditional dressed states, exact solution Schrödinger equation is obtained. The occupation atomic levels statistical population inversion studied. Our results show that parameter dissolved collapse periods increased maximum bounds upper state, while decreasing lower state. reduce minimum their inversion. On other hand, linear entropy l1 norm coherence are employed to measure temporal evolution mixedness coherence. It found improves However, have destructive intensity regarded as control with different values parameters.