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Custom nonlinearity profile for integrated quantum light sources

Salvador Poveda-Hospital, Yves-Alain Peter and Nicolás Quesada

Article (2023)

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Abstract

Heralded single-photon sources are a fundamental building block for optical quantum technologies. These sources need to be unfiltered and integrated to have good scalability and avoid unnecessary losses. To attain this goal, it is necessary to control the effective nonlinearity seen by the fields as they mix and propagate in a waveguide source. In this paper, we introduce a method to design nonlinear waveguides with arbitrarily shaped effective nonlinearity profiles. The method takes advantage of the fact that the second-order nonlinear response is a tensor quantity and thus the local effective nonlinearity of a material depends on the propagation direction of the fields participating in the interaction. Thus, by locally changing the propagation direction of the fields we can modulate the wave-mixing process. Our method allows for the waveguide fabrication process to be significantly simplified. The material structure of the waveguide is made by a single crystal, no longer needing oriented patterning or periodic poling. We use our method to design waveguides with a nonlinearity profile that is Gaussian in the propagation length, allowing the generation of perfectly pure heralded single photons.

Uncontrolled Keywords

Condensed Matter, Materials & Applied Physics; Atomic, Molecular & Optical; Quantum Information

Subjects: 3100 Physics > 3100 Physics
3150 Theoretical physics and chemistry > 3153 Classical and quantum physics
Department: Department of Mechanical Engineering
Funders: Ministére de l’Économie et de l’Innovation du Québec, CRSNG/NSERC
PolyPublie URL: https://publications.polymtl.ca/53383/
Journal Title: Physical Review Applied (vol. 19, no. 5)
Publisher: American Physical Society
DOI: 10.1103/physrevapplied.19.054033
Official URL: https://doi.org/10.1103/physrevapplied.19.054033
Date Deposited: 11 May 2023 13:41
Last Modified: 26 Sep 2024 11:28
Cite in APA 7: Poveda-Hospital, S., Peter, Y.-A., & Quesada, N. (2023). Custom nonlinearity profile for integrated quantum light sources. Physical Review Applied, 19(5), 054033 (9 pages). https://doi.org/10.1103/physrevapplied.19.054033

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