2025/10/17 by Nicholas V. Nardelli, Nardelli, Nicholas V., Dileep V. Reddy +13 · 1 citation
Physics and Astronomy · Computer Science · #Advanced Frequency and Time Standards #Cold Atom Physics and Bose-Einstein Condensates #Quantum Information and Cryptography
paper · pdf · doi:10.48550/arxiv.2510.16230
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.