THE EFFECT OF ENVIRONMENT INDUCED PURE DECOHERENCE ON THE GENERALIZEDJAYNES-CUMMINGS MODEL

We have studied the effect of environment induced pure decoherence on the generalized Jaynes-Cummings model (JCM). This generalized JCM is i ntroduced to take into account both atom-field interaction and a class of spin-orbit interactions in the same framework. For generalized JCM with atom-field interaction, it is shown that along with the suppress ion of the oscillatory behaviour of the atomic and field variables, in the steady state, atomic energy is transferred to the field or vice v ersa through the dressed state coherence depending on the initial cond ition of the atom-field system and the model under consideration. It i s also shown that initial Poissonian field acquires a sub-Poissonian c haracter in the steady state and thus all the nonclassical properties are not erased by the decoherence in JCM. An interesting effect of thi s decoherence mechanism is that it affects the population and coherenc e properties of the individual subsystem in a different way. As an exa mple of generalized JCM with spin-orbit interaction, the dynamics of s pin of the hydrogen atom in a magnetic field is studied to show the ef fect of decoherence.