We demonstrate the distribution of single-photon-level pulses from a mode-locked laser source over a phase-stable fiber link, achieving an optical timing jitter of less than 100 as over 10 minutes of data accumulation. This stability enables a fidelity greater than 0.998 between two stabilized 2.1 km long deployed fiber links. Building on time and frequency metrology techniques traditionally used for high-stability optical atomic clock signal distribution, we use time and frequency multiplexing to achieve an isolation of quantum and classical channels of 8×1010. Our results mark a necessary step towards scalable, high-rate quantum networks with a provable quantum advantage.
@article{arxiv.2510.16230,
title = {Phase-Stable Optical Fiber Links for Quantum Network Protocols},
author = {Nicholas V. Nardelli and Dileep V. Reddy and Michael Grayson and Daniel Sorensen and Martin J. Stevens and Michael D. Mazurek and L. Krister Shalm and Tara M. Fortier},
journal= {arXiv preprint arXiv:2510.16230},
year = {2026}
}