Journal
OPTICS EXPRESS
Volume 20, Issue 9, Pages -Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.009640
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Funding
- EQUO ESTEC [AO/1-5942/08/NL/EM, TEC 2010-14832, FIS2011-23520]
- Spanish Ministry of Science and Innovation
- EU
- Government of Spain [FIS2010-14831]
- project PHORBITECH [255914]
- ICREA Funding Source: Custom
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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. (c) 2012 Optical Society of America
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