QUANTUM TRAJECTORY THEORY FOR A 2-LEVEL ATOM IN A SQUEEZED VACUUM FIELD WITH NONRADIATIVE DEPHASING

The quantum trajectory theory is employed to study the decay of a two- level atom in a partial as well as a pure squeezed vacuum with non-rad iative dephasing. We show that ensemble averages taken over a large nu mber of trajectories are in perfect agreement with theoretical results . We find that single trajectories, however, reveal interesting featur es, which are not accessible by the theoretical approach. Specifically , single trajectories for one of the polarization quadratures of the a tom damped by classical (\M\ = N) and quantum (\M\(2) = N(N + 1)) sque ezed vacua reveal mostly coherent evolution in the latter. Resulting f rom this, the decay rate of the polarization quadrature for the quantu m squeezed vacuum is slower than that for the classical squeezed vacuu m.