Quantum-Phase Dynamics of Molecular Systems Interacting with a Two-Mode Squeezed Vacuum Field:Detuning Effects

摘要

We investigated several three-state molecular models interacting with an on/off-resonant two-mode squeezed vacuum field(TSV)to clarify the detuning effects on the dynamic behaviors of on/off-diagonal molecular density matrices.For comparison,we perform a parallel study in which the initial field is an on/off-resonant two-mode coherent field.In the case of satisfying both a large one-photon detuning and a two-photon resonance conditions,the magnitude of off-diagonal density matrix(|p_13|)between the second excited and the ground states for(TSV)exhibits distinct increase and decrease behaviors similar to the case of a two-mode coherent field in contrast to the case of one-and two-photon resonances,in which a random oscillation of |p_13| with a relatively high averaged value is observed.The change in the contribution of one-and two-photon processes due to the detuning of external fields and the differences in the quantum statistics of the initial quantum fields are found to cause such attractive variations in dynamics of the coherency between molecular electronic states as well as their populations.