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A cross-polarized twin-photon generation device was implemented with Ti-indiffused LiNbO 3 waveguides and gratings for Type-II (TE ! TE + TM) quasi-phase matching. Generation of polarization-entangled twin-photon beams by a simple system using the fabricated device is demonstrated through quantum interference and photon polarization measurement experiment. Index Terms-Integrated optics, quantum entanglement, quasiphase matching (QPM), twin photon.doi:10.1109/lpt.2007.900060 fatcat:f2flph7nmnebffuql5t7v7pncq