Quantum Control of Nitrogen-Vacancy Spins Using SOT-Driven nanoscale magnets

Building on our recent demonstration of coherent quantum control of a single nitrogen-vacancy (NV) center in diamond using nearfield microwaves generated from acoustically driven nanomagnets, we propose to realize electrical control of NV spins via spin orbit torque (SOT) driven nanomagnets. By exploiting spin orbit interactions in heavy-metal/ferromagnet heterostructures, SOT excitation can resonantly drive magnetization dynamics in patterned single domain nanomagnets, generating localized oscillating magnetic fields for coherent manipulation of proximal NV centers. We will explore various combinations of SOT heterostructures and nanomagnet anisotropy to achieve Rabi oscillations, Ramsey interference, and spin-echo sequences on NV centers, and compare their coherence properties with those achieved through surface acoustic wave excitation. The combination of nanoscale magnets and SOT-based control provides a compact and scalable route toward hybrid spintronic quantum systems.

[1] Chowdhury, M.F.F., Jung, A., La Spina, L., Bartasyte, A., Margueron, S. and Atulasimha, J., 2024. Energy efficient coherent quantum control of nitrogen vacancy (NV) spin with nanoscale magnets. arXiv preprint arXiv:2407.14018.

[2] Yan, G.Q., McLaughlin, N., Yamamoto, T., Li, S., Nozaki, T., Yuasa, S., Du, C.R. and Wang, H., 2024. Coherent Driving of a Single Nitrogen Vacancy Center by a Resonant Magnetic Tunnel Junction. Nano Letters, 24(45), pp.14273-14278.