Generation of spatially pure photon pairs in a multimode
nonlinear waveguide using intermodal dispersion

Michal Karpinski; Czeslaw Radzewicz; Konrad Banaszek

doi:10.1117/12.928840

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15 October 2012 Generation of spatially pure photon pairs in a multimode nonlinear waveguide using intermodal dispersion

Michal Karpinski, Czeslaw Radzewicz, Konrad Banaszek

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Proceedings Volume 8518, Quantum Communications and Quantum Imaging X; 85180J (2012) https://doi.org/10.1117/12.928840
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

We present experimental realization of type-II spontaneous parametric down-conversion in a periodically poled potassium titanyl phosphate (KTiOPO₄) nonlinear waveguide. We demonstrate that by careful exploitation of intermodal dispersion in the waveguide it is feasible to produce photon pairs in well defined transverse modes without any additional spatial filtering at the output. Spatial characteristics is verified by measurements of the M² beam quality factors. We also prepared a postselected polarization-entangled two-photon state shown to violate Bell’s inequality. Similar techniques based on intermodal dispersion can be used to generate spatial entanglement and hyperentanglement.

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Michal Karpinski, Czeslaw Radzewicz, and Konrad Banaszek "Generation of spatially pure photon pairs in a multimode nonlinear waveguide using intermodal dispersion", Proc. SPIE 8518, Quantum Communications and Quantum Imaging X, 85180J (15 October 2012); https://doi.org/10.1117/12.928840

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