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

Author(s): F. Steinlechner, P. Trojek, M. Jofre, H. Weier, T. Jennewein, R. Ursin, J. G. Rarity, M. W. Mitchell, J. P. Torres, H. Weinfurter, V. Pruneri

Journal: Optics Express

Volume: 20

Page(s): 9640-9649

Year: 2012

DOI Number: 10.1364/OE.20.009640

Link: Link to publication


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.

Note: http://arxiv.org/abs/1204.5330

File: Link to PDF

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