Electric-Field-Induced Coherent Control of Nitrogen Vacancy Centers*

In recent years, nitrogen vacancy (NV) centers in diamond have shown much promise as a versatile spin qubit for a range of emergent quantum applications. In the current state of the art, control of NV spin state is typically achieved with microwave (MW) fields generated by a proximate MW stripline. The spatially dispersive nature of the MW fields presents a significant challenge for realizing local and scalable manipulation of NV centers. In addition, current-induced Joule heating inherent to this approach can generate substantial thermal noise, resulting in decoherence of NV centers. To address these issues, here we report coherent control of NV center spins via spatially localized MW fields generated by a proximate magnetic tunnel junction (MTJ) device with voltage controlled magnetic anisotropy (VCMA). At ferromagnetic resonance conditions, coherent spin dynamics of the MTJ generate spatially localized magnetic stray fields, which can be utilized to drive coherent NV rabi oscillations. We further show that the measured NV rabi frequencies can be effectively modulated by adjusting the MTJ resonance conditions via VCMA. Our results demonstrate a new NV control scheme using localized MW fields, highlighting the potential of NV centers for realizing next-generation advanced quantum technologies.