Coexistence of Entanglement-based Quantum Channels with DWDM Classical Channels over Hollow Core Fibre in a Four Node Quantum Communication Network

• URL: http://arxiv.org/abs/2508.00072v1
• Date: Thu, 31 Jul 2025 18:04:02 GMT
• Title: Coexistence of Entanglement-based Quantum Channels with DWDM Classical Channels over Hollow Core Fibre in a Four Node Quantum Communication Network
• Authors: Marcus J Clark, Obada Alia, Sima Bahrani, Gregory T Jasion, Hesham Sakr, Periklis Petropoulos, Francesco Poletti, George T Kanellos, John Rarity, Reza Nejabati, Siddarth K Joshi, Rui Wang, Dimitra Simeonidou,
• Abstract summary: coexistence of three entanglement-based quantum channels with carrier-grade classical optical channels over $11.5$km hollow core nested antiresonant nodeless fibre.<n>A transmission of $800$Gbps is achieved with four classical channels simultaneously with three quantum channels all operating in the C-band with a separation of $1.2$nm.<n>We established quantum key distribution in the four-node full-mesh quantum network with Bell state fidelity of up to $90.0pm0.8$%.
• Score: 3.203408104623634
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We experimentally demonstrate the coexistence of three entanglement-based quantum channels with carrier-grade classical optical channels over $11.5$km hollow core nested antiresonant nodeless fibre, in a four user quantum network. A transmission of $800$Gbps is achieved with four classical channels simultaneously with three quantum channels all operating in the C-band with a separation of $1.2$nm, with aggregated coexistence power of $-3$dBm. We established quantum key distribution in the four-node full-mesh quantum network with Bell state fidelity of up to $90.0\pm0.8$%. The secret key rate for all the links in the network are passively preserved over $55$hours of experimental time.

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