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Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer

Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer

We demonstrate a simple, robust, high-flux source of polarization-entangled photons based on a polarization Sagnac interferometer, measuring 5000 polarization-entangled pairs/s/mW of pump power in a 1-nm bandwidth with 96.8% quantum-interference visibility.