Nonclassical effect in the MIT output coupler for the Bose-Einstein condensate

A quantum dynamical theory for output coupler of the trapped Bose-Einstein condensate is presented under no rotating wave approximation (RWA) based on the MIT experiment (Phys. Rev. Lett. 78 (1997) 582) for the atom laser. We show that the nonclassical properties, such as sub-Poisson distribution an d quadrature squeezing effect, can exist in the outcoupled atomic pulse as time evolves, which indicates an interesting optical control on quantum sta tistics of the atom laser through varying the strength of the input light. (C) 2001 Elsevier Science B.V. All rights reserved.