Ultra-Low Dissipation Superfluid Micromechanical Resonator

Abstract

Micro and nanomechanical resonators with ultra-low dissipation have great potential as useful quantum resources. The superfluid micromechanical resonators presented here possess several advantageous characteristics: straightforward thermalization, dissipationless flow, and in situ tunability. We identify and quantitatively model the various dissipation mechanisms in two resonators, one fabricated from borosilicate glass and one from single crystal quartz. As the resonators are cryogenically cooled into the superfluid state, the damping from thermal effects and from the normal fluid component are strongly suppressed. At our lowest temperatures, damping is limited solely by internal dissipation in the substrate materials, and reach quality factors up to 913,000 at 13 mK. By lifting this limitation through substrate material choice and resonator design, modelling suggests that the resonators should reach quality factors as high as 10${}^8$ at 100 mK, putting this architecture in an ideal position to harness mechanical quantum effects.

arXiv comment25 pages, 12 figures, 3 tables

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• Turbulent relaxation to equilibrium in a two-dimensional quantum vortex gas
• Observation of bistable turbulence in quasi-two-dimensional superflow
• Fabrication of micro fluidic cavities using Si-to-glass anodic bonding
• Tuning a 3D Microwave Cavity via Superfluid Helium at MilliKelvin Temperatures
• Phonon coupling between a nanomechanical resonator and a quantum fluid
• Surface-dominated finite size effects in nanoconfined superfluid helium
• Modelling of vorticity, sound and their interaction in two-dimensional superfluids
• Electromechanical feedback control of nanoscale superflow
• Superfluid Optomechanics with Phononic Nanostructures
• Proposal for a quantum traveling Brillouin resonator
• Detection of Quantized Vortices using Fourth Sound Attenuation
• Engineered entropic forces allow ultrastrong dynamical backaction
• Decay of two-dimensional superfluid turbulence over pinning surface