Cavity-Induced Enhancement of Squeezing in Resonance Fluorescence of a V-Type Three-Level Atom

摘要

The quadrature squeezing spectra in the resonance fluorescence ofa V-type three-level atom driven by a coherent field and coupled to a single-mode cavity is investigated.For weak excitation,the fluorescence field exhibit squeezing in the out-of-phase quadrature.The coupling between the atom and the cavity mode can greatly enhance the squeezing centred at the laser frequency.More importantly,for strong excitation,under the effect of the cavity-atom coupling,the in-phase quadrature of fluorescence can exhibit two-mode squeezing at the two inner sideband frequencies.By working in the dressed-state representation and hiring secular approximation,we give an analytical explanation for the effect.The result shows,under appropriate conditions,the squeezing can be greatly enhanced by appropriately tuning the cavity resonant frequency.