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The ability to manipulate entanglement between multiple spatially-separatedqubits is essential for quantum information processing. Althoughnitrogen-vacancy (NV) centers in diamond provide a promising qubit platform,developing scalable two-qubit gates remains a well-known challenge. To thisend, magnon-mediated entanglement proposals have attracted attention due totheir long-range spin-coherent propagation. Optimal device geometries and gateprotocols of such schemes, however, have yet to be determined. Here we predictstrong long-distance ($>\mu$m) NV-NV coupling via magnon modes withcooperativities exceeding unity in ferromagnetic bar and waveguide structures.Moreover, we explore and compare on-resonant transduction and off-resonantvirtual-magnon exchange protocols, and discuss their suitability for generatingor manipulating entangled states at low temperatures ($T\lesssim 150$ mK) underrealistic experimental conditions. This work will guide future experiments thataim to entangle spin qubits in solids with magnon excitations.

Opportunities for long-range magnon-mediated entanglement of spin qubits via on- and off-resonant coupling