Decay of the coupled state under the action of coherent quantized radiation

The decay of the coupled state under the action of the coherent and squeezed quantized field is investigated. In contrast to the cases of the classical radiation or the quantized field in the photon number representation, in the case of the quantized coherent or squeezed field the decay probability of the system has not the exponential feature. From the obtained results it follows, in particular, that at the large time values the survival probability of the system does not turn to zero. This circumstance is of interest from the point of view of study the quantum properties of the radiation field and for the identification of quantum field states. 12 refs