We apply an analytical model for anisotropic, colliding Bose-Einstein condensates in a spontaneous four-wave-mixing geometry to evaluate the second-order correlation function of the field of scattered atoms. Our approach uses quantized scattering modes and the equivalent of a classical, undepleted pump approximation. Results to lowest order in perturbation theory are compared with a recent experiment and with other theoretical approaches.

• Received 22 July 2008

DOI:https://doi.org/10.1103/PhysRevA.78.053605