The dissipation of the system and the atom in two-photon Jaynes-Cummings model with degenerate atomic levels

摘要

The method of perturbative expansion of master equation is employed to studythe dissipative properties of system and of atom in the two-photonJaynes-Cummings model (JCM) with degenerate atomic levels. The numericalresults show that the degeneracy of atomic levels prolongs the period ofentanglement between the atom and the field. The asymptotic value of atomiclinear entropy is apparently increased by the degeneration. The amplitude oflocal entanglement and disentanglement is suppressed. The better the initialcoherence property of the degenerate atom, the larger the coherence loss.