High-brightness fiber-based Sagnac source of entangled photon pairs for multiplexed quantum networks
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 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. A lumped device brightness of about 104 pairs s−1 nm−1 mW−2 is reported over several standard 100-GHz ITU channel pairs, 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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BibTeX
@article{troisi2026highbrightness,
title = {{High-brightness fiber-based Sagnac source of entangled photon pairs for multiplexed quantum networks}},
author = {Tess Troisi and Yoann Pelet and Romain Dalidet and Gregory Sauder and Olivier Alibart and Sébastien Tanzilli and Anthony Martin},
journal = {APL Engineering Physics},
year = {2026},
month = sep,
doi = {10.1063/5.0328026},
url = {https://hal.science/hal-05779812v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - High-brightness fiber-based Sagnac source of entangled photon pairs for multiplexed quantum networks
AU - Tess Troisi
AU - Yoann Pelet
AU - Romain Dalidet
AU - Gregory Sauder
AU - Olivier Alibart
AU - Sébastien Tanzilli
AU - Anthony Martin
PY - 2026
DA - 2026/09/01
JO - APL Engineering Physics
DO - 10.1063/5.0328026
UR - https://hal.science/hal-05779812v1
AB - 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 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. A lumped device brightness of about 104 pairs s−1 nm−1 mW−2 is reported over several standard 100-GHz ITU channel pairs, 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.
SN - 3066-7380
SN - 3066-7380
ER -