Giant Generation of Polarization-Entangled Photons in Metal Organic Framework Waveguides

• URL: http://arxiv.org/abs/2311.17263v1
• Date: Tue, 28 Nov 2023 22:51:41 GMT
• Title: Giant Generation of Polarization-Entangled Photons in Metal Organic Framework Waveguides
• Authors: Sim\'on Paiva, Ruben A. Fritz, Sanoj Raj, Yamil J. Col\'on, Felipe Herrera
• Abstract summary: Metal-organic frameworks (MOFs) are a novel class of optical materials with customizable nonlinear properties and proven chemical and optical stability. We study phase-matching conditions for collinear type-II spontaneous parametric down conversion with MOF-based one dimensional waveguides. We find that the biaxial MOF crystal improves two-fold the conversion efficiency over a periodically-poled KTP waveguide of identical dimensions.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Parametric nonlinear optical processes are instrumental in optical quantum technology for generating entangled light. However, the range of materials conventionally used for producing entangled photons is limited. Metal-organic frameworks (MOFs) have emerged as a novel class of optical materials with customizable nonlinear properties and proven chemical and optical stability. The large number of combinations of metal atoms and organic ligand from which bulk MOF crystals are known to form, facilitates the search of promising candidates for nonlinear optics. To accelerate the discovery of next-generation quantum light sources, we employ a multi-scale modeling approach to study phase-matching conditions for collinear degenerate type-II spontaneous parametric down conversion (SPDC) with MOF-based one dimensional waveguides. Using periodic-DFT calculations to compute the nonlinear optical properties of selected zinc-based MOF crystals, we predict polarization-entangled pair generation rates of $\sim 10^3-10^6$ s$^{-1}$mW$^{-1}$mm$^{-1}$ at 1064 nm, which are comparable with industry materials used in quantum optics. We find that the biaxial MOF crystal Zn(4-pyridylacrylate)$_2$ improves two-fold the conversion efficiency over a periodically-poled KTP waveguide of identical dimensions. This work underscores the great potential of MOF single crystals as entangled light sources for applications in quantum communication and sensing.

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