Crossed-crystal scheme for femtosecond-pulsed entangled photon generation in periodically poled potassium titanyl phosphate

Author(s): T. Scheidl, F. Tiefenbacher, R. Prevedel, F. Steinlechner, R. Ursin, A. Zeilinger

Journal: Phys. Rev. A

Volume: 89

Page(s): 042324

Year: 2014

DOI Number: 10.1103/PhysRevA.89.042324

Link: Link to publication


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.


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