Multipli-Entangled Photons from a Spontaneous Parametric Down-Conversion Source
Michael L. Fanto, Reinhard K. Erdmann, Paul M. Alsing, Corey J. Peters, Enrique J. Galvez · 2011
1. ABSTRACT 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.