The Hanle Effect in a Squeezed Vacuum
With several laboratories throughout the world able to generate squeezed light, it is natural to re-examine the interaction of atomic systems with such sources. Of particular interest are those phenomena which give rise to qualitatively new features when squeezed light, as compared with ordinary light, is employed. For example, Buzek et al. , and Ficek and Drummond  have shown that population trapping and inversion can occur in the steady-state of three level systems due to the two photon correlations induced by the squeezed vacuum. Qualitatively new features have also been reported in the resonance fluorescence of a two-level atom interacting with the squeezed vacuum , and in the related problem of probe absorption .