Nonclassical properties of photons and atoms in interaction of an atomic Bose–Einstein condensate with laser

Abstract

Abstract We study nonclassical properties of photons and atoms in interaction of 7Li atomic Bose–Einstein condensate in the ground-state hyperfine sublevel with laser field. When the quantized laser field is initially in a coherent state whereas the atomic field is initially in a displaced Fock state, respectively, it is shown that there exists the energy exchange between atoms in the condensate and photons in the quantized laser field. We find that a proper choice of the pulse area can significantly modify the atom (and photon) statistics from sub to super-Poissonian distribution, and vice versa. But there does not exist quadrature squeezing both for the quantized laser field and the atomic field. The analysis for photon–atom correlation shows that under some circumstances nonclassical correlation can be built.