Capacity and SKR tradeoff in coexisting classical and CV-QKD metropolitan-reach optical links

2025/12/16 by Çağla Özkan, Lucas Zischler, Ozkan, Cagla +9
Engineering · Physics and Astronomy · #Optical Network Technologies #Advanced Optical Network Technologies #Semiconductor Quantum Structures and Devices

paper · pdf · doi:10.48550/arxiv.2512.14408

Abstract

We demonstrate power-regime-dependent guardband optimization for quantum-classical coexistence in metropolitan DWDM. Quantum channel at band-edge with 100-150 GHz guardbands achieves 108% SKR improvement at -1.5 dBm/ch, incurring 3.4% capacity loss versus 6.8% for band-center.

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