  Phonons are considered to be universal quantum transducers due to their
ability to couple to a wide variety of quantum systems. Among these systems,
solid-state point defect spins are known for being long-lived optically
accessible quantum memories. Recently, it has been shown that
inversion-symmetric defects in diamond, such as the negatively charged silicon
vacancy center (SiV), feature spin qubits that are highly susceptible to
strain. Here, we leverage this strain response to achieve coherent and
low-power acoustic control of a single SiV spin, and perform acoustically
driven Ramsey interferometry of a single spin. Our results demonstrate a novel
and efficient method of spin control for these systems, offering a path towards
strong spin-phonon coupling and phonon-mediated hybrid quantum systems.
