Spontaneous emission from an extended wave packet : field correlations

Utilizing a recently found solution to the problem of a spontaneously radiating atom with an extended center-of-mass wave function [K. Rza̧żewski and W. Żakowicz, J. Phys. B 25, L319 (1992)] it is shown, for nonrelativistic atomic velocities, that the field density matrix is a statistical mixture of parts corresponding to emission from different positions within the wave packet.