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We investigate the effect of virtual photon processes (due to the antirotating terms in the Hamiltonian) on the time-dependent physical spectrum emitted by a two-level atom interacting with a single-mode quantized field in a perfect cavity. By means of a Heisenberg operator perturbative technique, a generalized emission spectrum is obtained which includes a contribution from the phase-dependent quantum...
We have studied the properties of coherent population trapping in a Raman-type photoionization system driven by a two-mode quantized field. The influence of the parameters describing the atom-field coupling character on the states of the field trapping the atom is analyzed. Under certain conditions, the atom driven by an appropriate two-mode SU(2) coherent field can be completely trapped in its two...
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