  We report, for the first time, the generation of entangled photon pairs via
type-0 spontaneous parametric down conversion in an ultra-thin wafer of lithium
niobate in which momentum between the pump photon and daughter photons is not
conserved. The characteristics of the emission are investigated using several
techniques. We find that non-phase matched SPDC is a promising source of
ultra-broadband two photon radiation that exhibits remarkably tight correlation
widths in both the spatial and temporal domains.
