Interference of cold atoms released from an optical lattice

We study interference of the cold atoms which are released out of the quasi one- dimensional optical lattice, for the different initial states of the system. In particular, in the case of the Mott- insulator initial state, the atomic- density distribution is shown to exhibit a non- trivial interference pattern, similar to that observed for BEC in double- well potential in the experiment by Andrews et al. ( Science, 275 ( 1997) 637).