  We study the behavior of a Bose-Einstein condensate held in an optical
lattice. We first show how a self-trapping transition can be induced in the
system by either increasing the number of atoms occupying a lattice site, or by
raising the interaction strength above a critical value. We then investigate
how applying a periodic driving potential to the self-trapped state can be used
to coherently control the emission of a precise number of correlated bosons
from the trapping-site. This allows the formation and transport of entangled
bosonic states, which are of great relevance to novel technologies such as
quantum information processing.
