Bright photon pair source with high spectral and spatial purity

J. C. Schaake; R. S. Bennink; P. G. Evans; W. P. Grice; T. S. Humble

doi:10.1117/12.884141

3 June 2011 Bright photon pair source with high spectral and spatial purity

J. C. Schaake, R. S. Bennink, P. G. Evans, W. P. Grice, T. S. Humble

Proceedings Volume 8057, Quantum Information and Computation IX; 805703 (2011) https://doi.org/10.1117/12.884141
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

Spontaneous parametric down-conversion (SPDC) is a reliable and robust source of photons for quantum information applications. For applications that involve operations such as entanglement swapping or single-photon heralding, two-photon states are required to be factorable (uncorrelated) in their spectral and spatial degrees of freedom. We report the design and experimental characterization of an SPDC source that has been optimized for high spectral and spatial purity. The source is pumped by the 776 nm output of a mode-locked Ti:Sapphire laser and consists of a periodically-poled Potassium Titanyl Phosphate (PPKTP) crystal phase-matched for collinear type-II SPDC. The dispersive properties of PPKTP at these wavelengths is such that it is possible to minimize the spectral entanglement by matching the widths of the pump to the spectral phase-matching function. The spatial entanglement is minimized through careful control of the pump focus, yielding nearly single-mode emission. An advantage of this approach is that the emission rate into the collection modes is very high, resulting in a very bright SPDC source. We also report a scheme that employs the output of collinear sources such as these to produce polarization-entangled photon pairs. The scheme, which requires only simple polarization elements, can be scaled to N-photon GHZ states.

Citation Download Citation

J. C. Schaake, R. S. Bennink, P. G. Evans, W. P. Grice, and T. S. Humble "Bright photon pair source with high spectral and spatial purity", Proc. SPIE 8057, Quantum Information and Computation IX, 805703 (3 June 2011); https://doi.org/10.1117/12.884141

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