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We have exactly solved a model of equidistant cascade four-level system inter- acting with a single-mode radiation fleld both semiclassically and quantum mechanically by exploiting its similarity with Jaynes{Cummings model. For the classical fleld, it is shown that the Rabi oscillation of the system initially in the flrst level (second level) is similar to that of the system when it is initially in the fourth level (third level). We then proceed to solve the quantized version of the model where the dressed state is constructed using a six-parameter four-dimensional matrix and show that the symmetry exhibited in the Rabi oscillation of the system for the semiclassical model is completely destroyed on the quantization of the cavity fleld. Finally, we have studied the collapse and revival of the system for the cavity fleld-mode in a coherent state to discuss the restoration of symmetry and its implication is discussed.

Effect of field quantization on Rabi oscillation of equidistant cascade four-level system