  Hybrid quantum systems (HQSs) have attracted several research interests in
the last years. In this Letter, we report on the design, fabrication, and
characterization of a novel diamond architecture for HQSs that consists of a
high quality thin circular diamond membrane with embedded near-surface
nitrogen-vacancy centers (NVCs). To demonstrate this architecture, we employed
the NVCs by means of their optical and spin interfaces as nanosensors of the
motion of the membrane under static pressure and in-resonance vibration, as
well as the residual stress of the membrane. Driving the membrane at its
fundamental resonance mode, we observed coupling of this vibrational mode to
the spin of the NVCs by Hahn echo signal. Our realization of this architecture
will enable futuristic HQS-based applications in diamond piezometry and
vibrometry, as well as spin-mechanical and mechanically mediated spin-spin
coupling in quantum information science.
