Quantum Repeater Chains via Cavity–Magnon for Scalable Quantum Networks

Scalable quantum networks require quantum repeaters to overcome major challenges, such as photon loss and decoherence, in long-distance quantum communication. In this article, we present a cavity–magnon quantum repeater architecture that exploits the frequency tunability and hybrid integration capabilities of magnonic platforms to enable efficient entanglement swapping across multihop networks. The coherence budget is explicitly incorporated via the dissipation and dephasing terms in our noise model, which sets the effective entanglement-storage window available for multihop swapping. Through comprehensive numerical simulations with realistic experimental parameters, we analyze system performance across diverse deployment scenarios and network scales, examining both short-range and long-distance implementations. We identify critical factors influencing performance and scalability, demonstrating that cavity–magnon systems represent a viable and promising quantum repeater platform with significant integration advantages over existing quantum memory technologies.