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Optics Communications

Efficient generation of a photon pair in a bulk periodically poled potassium titanyl phosphate

Bao‐Sen Shi, Chang Zhai, Guang‐Can Guo, Yun-Kun Jiang, Akihisa Tomita

Published Jul 12, 2007• 4 citations
Publisher
DOI
10.1016/j.optcom.2007.06.044

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We demonstrate a scheme for femtosecond pulsed spontaneous parametric down-conversion in periodically poled potassium titanyl phosphate crystals. Our scheme is based on a crossed crystal configuration with collinear quasi-phase-matching. The nondegenerate photon pairs are split in a fiber-based wavelength division multiplexer. The source is easier to align than common pulsed sources based on bulk beta barium borate crystals and exhibits high-quality polarization entanglement as well as nonclassical interference capabilities. Hence, we expect this source to be a well-suited candidate for multiphoton state generation, e.g., for linear optical quantum computation and quantum communication networks.