Monte Carlo wave-function approach to teh quantum-phase dynamics of a dissipative molecular system interacting with a single-mode amplitude-squeezed field

摘要

We investigate the quantum-phase dynamics of a dissipative molecular system interacting with a single-mode amplitude-Squeezed field (with a sub-Poissionian photon-numbe distribution)using the Monte Carlo wave-function method.As quantum dissipation,we consider molecular coherent (phase)and population relaxations,which are caused by nuclear vibration,and acvity relaxation (the dissipation of an internal single mode to outer mode).In thsi study,we elucidate te effects of these dissipations on the unique quantum dynamical behaviors of thsi coupled system.e.g., collapse-revival behavior of Rabi osscillations,usign the quasiprobability (Q functin)distribution of a single-mode field and the off-diagonal molecular density matrix.It is found that although the amplitude-squeezed field exhibits a distinct revival with larger amplitudes of molecular population in the presence of the molecular phase and population relaxations as compared to the coherent fielda very slight cavity relaxation suppresses the revival of molecular population and ate increase in the magnitude of off-diagonal molecular density matrices during the quiescent region in the amplitude-squeezed filed case more significantly than in the coherent field case.These features are shown to be closely related to the difference in the dynamics of Q function distributins between amplitude-squeezed and coherent fields.