High-brightness fiber-based Sagnac source of entangled photon pairs for multiplexed quantum networks
- URL: http://arxiv.org/abs/2602.08863v1
- Date: Mon, 09 Feb 2026 16:26:56 GMT
- Title: High-brightness fiber-based Sagnac source of entangled photon pairs for multiplexed quantum networks
- Authors: Tess Troisi, Yoann Pelet, Romain Dalidet, Gregory Sauder, Olivier Alibart, Sébastien Tanzilli, Anthony Martin,
- Abstract summary: A fully fibered source of entangled photon pairs based on a nonlinear Sagnac interferometer is reported.<n>Generation stage supports both polarization and energy-time entanglement without modification.<n>Results demonstrate that the proposed Sagnac source is a practical and scalable building block for future plug-and-play quantum communication and quantum networking platforms.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: A fully fibered source of entangled photon pairs based on a nonlinear Sagnac interferometer is reported. Operating at telecom wavelengths, the source relies exclusively on standard fiber-optic components and periodically poled lithium niobate (PPLN) waveguides, resulting in a compact, robust, and field-deployable architecture. The generation stage supports both polarization and energy-time entanglement without modification, enabling versatile operation depending on the targeted application. Broadband spontaneous parametric down-conversion allows dense wavelength-division multiplexing over the telecom C and L bands. High normalized brightness (10.3 kpairs/s/nm/mW$^2$) is achieved on a standard 100 GHz ITU channel pair, together with high entanglement quality. Polarization and energy-time encodings are characterized through state tomography and two-photon interference measurements, yielding fidelities, purities, and visibilities exceeding 96 % over multiple wavelength channels. The stability and reproducibility of the source are further evaluated through long-duration operation in a network environment. These results demonstrate that the proposed Sagnac source constitutes a practical and scalable building block for future plug-and-play quantum communication and quantum networking platforms.
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