A polarization entangled photon-pair source based on a type-II PPLN waveguide emitting at a telecom wavelength

Abstract

We report the realization of a fiber coupled polarization entangled\nphoton-pair source at 1310 nm based on a birefringent titanium in-diffused\nwaveguide integrated on periodically poled lithium niobate. By taking advantage\nof a dedicated and high-performance setup, we characterized the quantum\nproperties of the pairs by measuring two-photon interference in both\nHong-Ou-Mandel and standard Bell inequality configurations. We obtained, for\nthe two sets of measurements, interference net visibilities reaching nearly\n100%, which represent important and competitive results compared to similar\nwaveguide-based configurations already reported. These results prove the\nrelevance of our approach as an enabling technology for long-distance quantum\ncommunication.\n