We experimentally demonstrate the coexistence of three entanglement-based quantum channels with carrier-grade classical optical channels over 11.5km hollow core nested antiresonant nodeless fibre, in a four user quantum network. A transmission of 800Gbps is achieved with four classical channels simultaneously with three quantum channels all operating in the C-band with a separation of 1.2nm, with aggregated coexistence power of −3dBm. We established quantum key distribution in the four-node full-mesh quantum network with Bell state fidelity of up to 90.0±0.8%. The secret key rate for all the links in the network are passively preserved over 55hours of experimental time.
@article{arxiv.2508.00072,
title = {Coexistence of Entanglement-based Quantum Channels with DWDM Classical Channels over Hollow Core Fibre in a Four Node Quantum Communication Network},
author = {Marcus J Clark and Obada Alia and Sima Bahrani and Gregory T Jasion and Hesham Sakr and Periklis Petropoulos and Francesco Poletti and George T Kanellos and John Rarity and Reza Nejabati and Siddarth K Joshi and Rui Wang and Dimitra Simeonidou},
journal= {arXiv preprint arXiv:2508.00072},
year = {2025}
}