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Quantum 2.0 Conference and Exhibition

Optimization of inhibited-coupling hollow-core fibers for quantum entangled photon source platforms

Lorenzo Rosa, Walter Belardi, Federico Melli, Annamaria Cucinotta, Luca Vincetti

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We present developments on generation platforms for correlated entangled photon pairs in gases using hollow-core inhibited-coupling optical fibers. Non-linear simulation on tube lattice fibers can be accomplished through innovative techniques based on fast analytical optimization.
DOI
10.1364/quantum.2024.qw3a.14

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We present a comprehensive numerical investigation of entangled photon pair generation via spontaneous four-wave mixing (SFWM) in hollow-core photonic crystal fibers (HC-PCFs). By analyzing various fiber geometries, dispersion profiles, and anti-resonant characteristics, we identify optimal configurations that enhance photon-pair generation efficiency. Our study highlights the crucial roles of group velocity dispersion engineering, pump parameters, and phase-matching conditions in shaping the joint spectral amplitude (JSA) of the emitted photons. Utilizing gas-filled or evacuated HC-PCFs significantly reduces Raman noise by minimizing field overlap with the glass, while maintaining strong nonlinear interactions. The results reveal practical regimes for improving spectral purity and heralding efficiency. These findings provide practical design guidelines for scalable, low-noise quantum light sources suitable for quantum communication technologies.
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This dissertation describes the development and verification of a fiber based prototype system for generating entangled photon pairs with a reduced spontaneous Raman scattering background compared to solid-core optical fibers. To achieve this goal, the guidance properties of hollow-core photonic bandgap fibers are combined with the density variability and high optical nonlinearity of supercritical xenon fluid. The dispersion properties of the system provide the proper conditions for the spontaneous generation of entangled photons by the nonlinear process of degenerate four-wave mixing. By altering the density of supercritical xenon in the fiber, the conditions for the four-wave mixing can be modified to tune the frequencies of the entangled photons.