Passive Synchronization of Nonlocal Franson Interferometry for Fiber-Based Quantum Networks Using Co-propagating Classical Clock Signals

• URL: http://arxiv.org/abs/2602.21483v1
• Date: Wed, 25 Feb 2026 01:23:00 GMT
• Title: Passive Synchronization of Nonlocal Franson Interferometry for Fiber-Based Quantum Networks Using Co-propagating Classical Clock Signals
• Authors: Xiao Xiang, Runai Quan, Yuting Liu, Huibo Hong, Bingke Shi, Zhiguang Xia, Xinghua Li, Tao Liu, Shougang Zhang, Ruifang Dong,
• Abstract summary: Over 50 km of single-mode fiber, this co-propagation enables nonlocal quantum interference with a visibility of (88.35pm3.62)%.<n>This work provides a practical, scalable synchronization solution for metropolitan-scale entanglement-based quantum networks.
• Score: 8.327606178766588
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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