Cavity Resonance Fluorescence in a Squeezed Vacuum
As several laboratories throughout the world are now able to generate squeezed light, it is of particular interest to identify those phenomena which give rise to qualitatively new features when this light source is introduced. We have recently studied resonance fluorescence in the presence of a squeezed vacuum in the free space environment , and shown that, ‘anomalous’ spectra, with lineshapes quite unlike those normally seen in this phenomenon. may be obtained under certain conditions. However, a disadvantage of the free space situation is that, it requires all 4π radians of space to be filled with squeezed light a formidable experimental problem. The cavity environment, which only requires squeezing over a modest solid angle, is therefore the most likely one for the observation of these effects. Here we calculate numerically the properties of a two-level atom in a cavity interacting with a broadband squeezed vacuum, and show that anomalous features also arise in the resonance fluorescence of this system. Our system is described by the master equation with , , , with ωc,ω L ,ω1 and ω s the cavity, laser, Bohr and squeezed vacuum carrier frequencies respectively, ∈ the driving field amplitude, k the cavity decay rate. γ the atomic decay rate in the cavity and g the atom-cavity field coupling. The squeezed vacuum is characterized by the parameters N, M and Ф where 0≤ŋ≤1.