Passive Synchronization of Nonlocal Franson Interferometry for Fiber-Based Quantum Networks Using Co-propagating Classical Clock Signals
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866908852000129024 |
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| author | Xiang, Xiao Quan, Runai Liu, Yuting Hong, Huibo Shi, Bingke Xia, Zhiguang Li, Xinghua Liu, Tao Zhang, Shougang Dong, Ruifang |
| author_facet | Xiang, Xiao Quan, Runai Liu, Yuting Hong, Huibo Shi, Bingke Xia, Zhiguang Li, Xinghua Liu, Tao Zhang, Shougang Dong, Ruifang |
| contents | We demonstrate a robust, high-visibility nonlocal Franson interferometry for fiber-based quantum networks by co-propagating a classical Radio-over-Fiber clock signal with energy-time entangled photon pairs in the same fiber. Utilizing cross-band allocation (O-band for classical, L-band for quantum signals), the spontaneous Raman scattering noise photons are effectively suppressed. At the same time, their environmental delay fluctuations remain highly correlated for common-mode noise cancellation, achieving a passive synchronization with picoseconds precision. Over 50 km of single-mode fiber, this co-propagation enables nonlocal quantum interference with a visibility of (88.35\pm3.62)%, without relying on external dedicated timing infrastructure. This work provides a practical, scalable synchronization solution for metropolitan-scale entanglement-based quantum networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_21483 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Passive Synchronization of Nonlocal Franson Interferometry for Fiber-Based Quantum Networks Using Co-propagating Classical Clock Signals Xiang, Xiao Quan, Runai Liu, Yuting Hong, Huibo Shi, Bingke Xia, Zhiguang Li, Xinghua Liu, Tao Zhang, Shougang Dong, Ruifang Quantum Physics We demonstrate a robust, high-visibility nonlocal Franson interferometry for fiber-based quantum networks by co-propagating a classical Radio-over-Fiber clock signal with energy-time entangled photon pairs in the same fiber. Utilizing cross-band allocation (O-band for classical, L-band for quantum signals), the spontaneous Raman scattering noise photons are effectively suppressed. At the same time, their environmental delay fluctuations remain highly correlated for common-mode noise cancellation, achieving a passive synchronization with picoseconds precision. Over 50 km of single-mode fiber, this co-propagation enables nonlocal quantum interference with a visibility of (88.35\pm3.62)%, without relying on external dedicated timing infrastructure. This work provides a practical, scalable synchronization solution for metropolitan-scale entanglement-based quantum networks. |
| title | Passive Synchronization of Nonlocal Franson Interferometry for Fiber-Based Quantum Networks Using Co-propagating Classical Clock Signals |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2602.21483 |