Scalable coherent quantum control of single NV-center with nanoscale magnets

Achieving high-fidelity quantum gates requires precise, localized control of spin qubits while minimizing errors and cross-talk between neighboring qubits. Previously, we have shown the feasibility of scalable, small footprint and high-fidelity single-qubit quantum gates by tuning the electric field drive of nanomagnets and skyrmions, confined to a nanoscale volume [1-2]. In this work, we experimentally demonstrate coherent quantum control of a nitrogen vacancy (NV) center in diamond with microwave fields from a proximal nanoscale magnet [3]. We observe coherent control with high contrast Rabi oscillations using the nanomagnets, driven by surface acoustic wave in LiNbO₃. Furthermore, we achieve control over Rabi frequency with varying acoustic power. The use of nanoscale magnets to implement highly localized and energy efficient coherent quantum control could potentially pave the way to replace thermally noisy microwave circuits and demonstrate a path to scalable quantum computing and sensing with NV-defects in diamond and other spin qubits.

1.Niknam, M, et al. Comm Phy 5, 284 no. 1 (2022).

2. Chowdhury, M.F.F., et al. arXiv https://arxiv.org/abs/2401.00573.

3. Chowdhury, M.F.F., et al. arXiv https://arxiv.org/abs/2407.14018.