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A high-brightness source of polarization-entangled photons optimized for applications in free space

We present a simple but highly efficient source of polarization-entangled photons based on spontaneous parametric down-conversion (SPDC) in bulk periodically poled potassium titanyl phosphate crystals (PPKTP) pumped by a 405 nm laser diode. Utilizing one of the highest available nonlinear coefficients in a non-degenerate, collinear type-0 phase-matching configuration, we generate polarization entanglement via the crossed-crystal scheme and detect 0.64 million photon pair events/s/mW, while maintaining an overlap fidelity with the ideal Bell state of 0.98 at a pump power of 0.025 mW.

preprint2012arXivOpen access
Fabian SteinlechnerPavel TrojekMarc JofreHenning WeierDaniel PerezThomas JenneweinRupert UrsinJohn RarityMorgan W. MitchellJuan P. TorresHarald WeinfurterValerio Pruneri
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Fabian SteinlechnerPavel TrojekMarc JofreHenning WeierDaniel PerezThomas JenneweinRupert UrsinJohn RarityMorgan W. MitchellJuan P. TorresHarald WeinfurterValerio Pruneri

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A high-brightness source of polarization-entangled photons optimized for applications in free space | BZPEER | BZPEER