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Coherent control of the nitrogen-vacancy (NV) center in diamond's tripletspin state has traditionally been accomplished with resonant ac magnetic fieldsunder the constraint of the magnetic dipole selection rule, which forbidsdirect control of the $|-1>\leftrightarrow |+1>$ spin transition. We show thathigh-frequency stress resonant with the spin state splitting can coherentlycontrol NV center spins within this subspace. Using a bulk-mode mechanicalmicroresonator fabricated from single-crystal diamond, we apply intense acstress to the diamond substrate and observe mechanically driven Rabioscillations between the $|-1>$ and $|+1>$ states of an NV center spinensemble. Additionally, we measure the inhomogeneous spin dephasing time($T_{2}^{*}$) of the spin ensemble using a mechanical Ramsey sequence andcompare it to the dephasing times measured with a magnetic Ramsey sequence foreach of the three spin qubit combinations available within the NV center groundstate. These results demonstrate coherent spin driving with a mechanicalresonator and could enable the creation of a phase-sensitive $\Delta$-systemwithin the NV center ground state.

Coherent Control of a Nitrogen-Vacancy Center Spin Ensemble with a Diamond Mechanical Resonator