Orthogonal quasi-phase-matched superlattice for generation of hyperentangled photons

Abstract A crystal superlattice structure featuring nonlinear layers with alternating orthogonal optic axes interleaved with orthogonal poling directions, is shown to generate high-quality hyperentangled photon pairs via orthogonal quasi-phase-matched spontaneous parametric downconversion. We demons...

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Autores principales:	Salem F. Hegazy, Salah S. A. Obayya, Bahaa E. A. Saleh
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/11fc6ef8a2cd4259baff09edbc32e78c
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spelling	oai:doaj.org-article:11fc6ef8a2cd4259baff09edbc32e78c2021-12-02T12:32:26ZOrthogonal quasi-phase-matched superlattice for generation of hyperentangled photons10.1038/s41598-017-03023-12045-2322https://doaj.org/article/11fc6ef8a2cd4259baff09edbc32e78c2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03023-1https://doaj.org/toc/2045-2322Abstract A crystal superlattice structure featuring nonlinear layers with alternating orthogonal optic axes interleaved with orthogonal poling directions, is shown to generate high-quality hyperentangled photon pairs via orthogonal quasi-phase-matched spontaneous parametric downconversion. We demonstrate that orthogonal quasi-phase matching (QPM) processes in a single nonlinear domain structure correct phase and group-velocity mismatches concurrently. Compared with the conventional two-orthogonal-crystals source and the double-nonlinearity single-crystal source, the orthogonal QPM superlattice is shown to suppress the spatial and temporal distinguishability of the generated photon pairs by several orders of magnitude, depending on the number of layers. This enhanced all-over-the-cone indistinguishability enables the generation of higher fluxes of photon-pairs by means of the combined use of (a) long nonlinear crystal in noncollinear geometry, (b) low coherence-time pumping and ultra-wide-band spectral detection, and (c) focused pumping and over-the-cone detection. While each of these three features is challenging by itself, it is remarkable that the orthogonal QPM superlattice meets all of these challenges without the need for separate spatial or temporal compensation.Salem F. HegazySalah S. A. ObayyaBahaa E. A. SalehNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-14 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Salem F. Hegazy Salah S. A. Obayya Bahaa E. A. Saleh Orthogonal quasi-phase-matched superlattice for generation of hyperentangled photons
description	Abstract A crystal superlattice structure featuring nonlinear layers with alternating orthogonal optic axes interleaved with orthogonal poling directions, is shown to generate high-quality hyperentangled photon pairs via orthogonal quasi-phase-matched spontaneous parametric downconversion. We demonstrate that orthogonal quasi-phase matching (QPM) processes in a single nonlinear domain structure correct phase and group-velocity mismatches concurrently. Compared with the conventional two-orthogonal-crystals source and the double-nonlinearity single-crystal source, the orthogonal QPM superlattice is shown to suppress the spatial and temporal distinguishability of the generated photon pairs by several orders of magnitude, depending on the number of layers. This enhanced all-over-the-cone indistinguishability enables the generation of higher fluxes of photon-pairs by means of the combined use of (a) long nonlinear crystal in noncollinear geometry, (b) low coherence-time pumping and ultra-wide-band spectral detection, and (c) focused pumping and over-the-cone detection. While each of these three features is challenging by itself, it is remarkable that the orthogonal QPM superlattice meets all of these challenges without the need for separate spatial or temporal compensation.
format	article
author	Salem F. Hegazy Salah S. A. Obayya Bahaa E. A. Saleh
author_facet	Salem F. Hegazy Salah S. A. Obayya Bahaa E. A. Saleh
author_sort	Salem F. Hegazy
title	Orthogonal quasi-phase-matched superlattice for generation of hyperentangled photons
title_short	Orthogonal quasi-phase-matched superlattice for generation of hyperentangled photons
title_full	Orthogonal quasi-phase-matched superlattice for generation of hyperentangled photons
title_fullStr	Orthogonal quasi-phase-matched superlattice for generation of hyperentangled photons
title_full_unstemmed	Orthogonal quasi-phase-matched superlattice for generation of hyperentangled photons
title_sort	orthogonal quasi-phase-matched superlattice for generation of hyperentangled photons
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/11fc6ef8a2cd4259baff09edbc32e78c
work_keys_str_mv	AT salemfhegazy orthogonalquasiphasematchedsuperlatticeforgenerationofhyperentangledphotons AT salahsaobayya orthogonalquasiphasematchedsuperlatticeforgenerationofhyperentangledphotons AT bahaaeasaleh orthogonalquasiphasematchedsuperlatticeforgenerationofhyperentangledphotons
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Orthogonal quasi-phase-matched superlattice for generation of hyperentangled photons

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