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3 June 2011 Multipli-entangled photon spontaneous parametric down-conversion source
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In this work, we discuss a novel compact source that generates six pairs of entangled photons via spontaneous parametric down-conversion from a single pass of a pump beam through a crystal assembly. The experimental demonstrations reported are at 810 nm so as to utilize high quantum efficiency Si-APD detectors, but the design can be readily implemented in other wavelength regimes including the telecom bands near 1550 nm. An immediate application of this source enables particular multi-qubit cluster states to be generated in a highly compact unidirectional configuration. This can significantly simplify the interferometric stability, as well as feed-forward methods required in photon-based quantum logic circuitry.
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Michael L. Fanto, Reinhard K. Erdmann, Paul M. Alsing, Corey J. Peters, and Enrique J. Galvez "Multipli-entangled photon spontaneous parametric down-conversion source", Proc. SPIE 8057, Quantum Information and Computation IX, 805705 (3 June 2011);

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