Negatively charged silicon vacancy ($\mathrm{Si}$${\mathrm{V}}^{-}$) centers in diamond are leading candidates for solid-state quantum memory that can be controlled using electromagnetic or acoustic waves. The latter are particularly promising due to the strong strain response of $\mathrm{Si}$${\mathrm{V}}^{-}$, enabling large spin-phonon interaction strengths. Indeed, coherent spin control via surface acoustic waves (SAWs) has been demonstrated and is essential for developing on-chip phononic quantum networks. However, the absence of piezoelectricity in diamond requires an interface with a piezoelectric material for efficient transduction and delivery of acoustic waves to spins in diamonds. Here, we demonstrate a heterogeneously integrated phononic platform that combines thin-film lithium niobate with diamond to enable acoustic control of single $\mathrm{Si}$${\mathrm{V}}^{-}$ spins. Additionally, leveraging large SAW-induced strain at the location of $\mathrm{Si}$${\mathrm{V}}^{-}$, we achieve coherent acoustic control of an electron spin with more than twofold improvement in Rabi frequency compared to state-of-the-art devices based on aluminum nitride on diamond. This work represents a crucial step towards realizing phonon-based quantum information processing systems.

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• Quantum information with hybrid systems
• Quantum memories
• Quantum networks
• Silicon vacancies
• Spin-phonon coupling
• Piezoelectrics
• Optically detected magnetic resonance
• Surface acoustic wave