  Enabling scalable and energy-efficient control of spin defects in solid-state
media is desirable for realizing transformative quantum information
technologies. Exploiting voltage-controlled magnetic anisotropy, we report
coherent manipulation of nitrogen-vacancy (NV) centers by the spatially
confined magnetic stray fields produced by a proximate resonant magnetic tunnel
junction (MTJ). Remarkably, the coherent coupling between NV centers and the
MTJ can be systematically controlled by a DC bias voltage, allowing for
appreciable electrical tunability in the presented hybrid system. In comparison
with current state-of-the-art techniques, the demonstrated NV-based quantum
operational platform exhibits significant advantages in scalability, device
compatibility, and energy-efficiency, further expanding the role of NV centers
in a broad range of quantum computing, sensing, and communications
applications.
