Fig. 3: Optically detected acoustic resonance (ODAR) measurements of the SiV spin transition.

a Optical and acoustic pulse sequences used for ODAR measurement. The laser is resonant with the C1 transition and initializes the SiV into \(\left|\uparrow \right\rangle\). A \(20\ {\text{ns}}\) duration SAW pulse drives population between \(\left|\uparrow \right\rangle\) and \(\left|\downarrow \right\rangle\). b Time-resolved histogram of photon detection events corresponding to the pulse sequence in a. The height of the peaks at the beginning of the initialization and readout pulses is proportional to the population in \(\left|\downarrow \right\rangle\). Photon detections are integrated over \(10\ {\text{ns}}\) (indicated by the shaded region) to determine initialization and readout signals. c Normalized population in the \(\left|\downarrow \right\rangle\) state as the center frequency of the acoustic pulse is varied, calculated as the ratio between the readout and initialization signals. A maximum is obtained at \(3.43\ {\text{GHz}}\), indicating the resonance frequency of the SiV spin transition. The error bars represent the standard deviation of the normalized population.