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

We study nonclassical properties of photons and atoms in interaction of Li- 7 atomic Bose-Einstein condensate in the groundstate hyperfine sublevel wit h laser field. When the quantized laser field is initially in a coherent st ate whereas the atomic field is initially in a displaced Fock state, respec tively, 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 pro per 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 fiel d and the atomic field. The analysis for photon-atom correlation shows that under some circumstances nonclassical correlation can be built. (C) 2001 P ublished by Elsevier Science B.V.