Entanglement serves as a fundamental resource for quantum technologies, enabling communication and computation tasks that surpass classical limits. Its distribution across networks is essential for interconnecting quantum processors, enabling distributed quantum computing to address complex challenges in areas such as drug discovery, material science, and optimization. In this work, we report the successful distribution of polarization-entangled photon pairs across a campus-scale, three-node quantum network comprising both fiber and free-space optical links. The entire system was built using commercially available components provided by partners within the Netherlands Quantum Ecosystem. This result represents advancements in the technological maturity of quantum communication systems and demonstrates a pathway towards the practical deployment of early-stage quantum networks both on Earth and in space.
@article{arxiv.2508.11023,
title = {Hybrid Fiber-Free-Space Entanglement Distribution Using Off-the-Shelf Quantum Devices},
author = {Gustavo C. Amaral and Nienke M. ten Haaf and Breno Perlingeiro and David L. Bakker and Mark G. M. Boekel and Tim E. van Duivenbode and Karthik Selvan and Nicolas Oidtmann and Rafael Ochsendorf and Rick N. M. Wasserman and Mael Flament and Felipe Giraldo and Shane Andrewski and Mehdi Namazi and Federica Facchin and Mario Castañeda and Fokko de Vries and Sayali Shevate and Shaurya Bhave and Marco Gorter and Nico Coesel and David Mytling and Mike Mabry and Carlo Page and Alexandra Pinto and Joanneke Jansen and Rahul Vyas and Marc X. Makkes},
journal= {arXiv preprint arXiv:2508.11023},
year = {2025}
}