Surface Acoustic Wave Resonator*

Surface acoustic waves (SAWs) are a versatile tool for coherently interfacing with a variety of solid-state quantum systems spanning microwave to optical frequencies, including superconducting qubits, spins, and quantum emitters [1]. Here, we demonstrate cavity optomechanics with 2D materials, specifically monolayer WSe₂, embedded in a planar lithium niobate SAW resonator driven by superconducting electronics. Using steady-state photoluminescence spectroscopy and time-resolved single-photon counting, we map the temporal dynamics of modulated 2D emitters under coupling to different SAW cavity modes, showing energy-level splitting consistent with deformation potential coupling. Cavity optomechanics with SAWs and 2D quantum emitters, and their sensitivity to strain with > 50 meV/%, points to new opportunities for compact sensors and quantum electro-optomechanics in a multifunctional integrated platform that combines phononic, optical, and superconducting electronic quantum systems.

[1] IEEE Transactions on Quantum Engineering 3, 5100217 (2022)