High-brightness fiber-based Sagnac source of entangled photon pairs for multiplexed quantum networks
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910016685998080 |
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| author | Troisi, Tess Pelet, Yoann Dalidet, Romain Sauder, Gregory Alibart, Olivier Tanzilli, Sébastien Martin, Anthony |
| author_facet | Troisi, Tess Pelet, Yoann Dalidet, Romain Sauder, Gregory Alibart, Olivier Tanzilli, Sébastien Martin, Anthony |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_08863 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-brightness fiber-based Sagnac source of entangled photon pairs for multiplexed quantum networks Troisi, Tess Pelet, Yoann Dalidet, Romain Sauder, Gregory Alibart, Olivier Tanzilli, Sébastien Martin, Anthony Quantum Physics 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. |
| title | High-brightness fiber-based Sagnac source of entangled photon pairs for multiplexed quantum networks |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2602.08863 |