Quasi-phase-matched (QPM) Ti : LiNbO3waveguide devices for generation of postselection-free polarization-entangled twin photons are proposed. The devices consist of cascaded two sections of slightly different QPM parameters. Generation of the entangled photons in the telecommunication band in a fabricated device of 2 times 15 mm interaction length is demonstrated through photon coincidence counting and quantum interference experiments.
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Suhara et al. (2009) studied this question.
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