Lb. Han et al., Two-mode SU (1,1) Schrodinger cat states and atomic coherent population trapping in a cascade three-level system, ACT PHY C E, 49(4), 2000, pp. 696-701
We have studied atomic coherent population trapping in a cascade three-leve
l atom interacting with a two-mode quantized field mediated by two-photon p
rocesses. The states of the field trapping the atom are obtained, which are
two-mode SU(1,1) Schrodinger cat states, and the nonclassical properties o
f these states are discussed.