Quantum electromechanics of a hypersonic crystal
arXiv:1808.04874 · doi:10.1038/s41565-019-0377-2
Abstract
Radiation pressure within engineered structures has recently been used to couple the motion of nanomechanical objects with high sensitivity to optical and microwave electromagnetic fields. Here, we demonstrate a form of electromechanical crystal for coupling microwave photons and hypersonic phonons by embedding the vacuum-gap capacitor of a superconducting resonator within a phononic crystal acoustic cavity. Utilizing a two-photon resonance condition for efficient microwave pumping and a phononic bandgap shield to eliminate acoustic radiation, we demonstrate large cooperative coupling () between a pair of electrical resonances at GHz and an acoustic resonance at GHz. Electrical read-out of the phonon occupancy shows that the hypersonic acoustic mode has an intrinsic energy decay time of ms and thermalizes close to its quantum ground-state of motion (occupancy ) at a fridge temperature of mK. Such an electromechanical transducer is envisioned as part of a hybrid quantum circuit architecture, capable of interfacing to both superconducting qubits and optical photons.
arXiv comment16 pages, 12 figures, 8 appendices
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