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Coherent communication over mesoscale distances is a necessary condition forthe application of solid-state spin qubits to scalable quantum informationprocessing. Among other routes under study, one possibility entails thegeneration of magnetostatic surface spin waves (MSSW) dipolarly coupled toshallow paramagnetic defects in wide-bandgap semiconductors. As an initial stepin this direction, here we make use of room-temperature MSSWs to mediate theinteraction between the microwave field from an antenna and the spin of anitrogen-vacancy (NV) center in diamond. We show that this transport spansdistances exceeding 3 mm, a manifestation of the MSSW robustness and longdiffusion length. Using the NV spin as a local sensor, we find that the MSSWamplitude grows linearly with the applied microwave power, suggesting thisapproach could be extended to amplify the signal from neighboring spin qubitsby several orders of magnitude.

Long-distance excitation of nitrogen-vacancy centers in diamond via surface spin waves