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arXiv · 1601.04019

Superconducting cavity-electromechanics on silicon-on-insulator

Paul B. Dieterle·Mahmoud Kalaee·Johannes Fink·Oskar Painter
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Abstract

Fabrication processes involving anhydrous hydrofluoric vapor etching are developed to create high-$Q$ aluminum superconducting microwave resonators on free-standing silicon membranes formed from a silicon-on-insulator wafer. Using this fabrication process, a high-impedance $8.9$GHz coil resonator is coupled capacitively with large participation ratio to a $9.7$MHz micromechanical resonator. Two-tone microwave spectroscopy and radiation pressure back-action are used to characterize the coupled system in a dilution refrigerator down to temperatures of $T_f = 11$~mK, yielding a measured electromechanical vacuum coupling rate of $g_{0}/2\pi \approx 24.6$~Hz and a mechanical resonator $Q$-factor of $Q_{m}=1.7\times 10^7$. Microwave back-action cooling of the mechanical resonator is also studied, with a minimum phonon occupancy of $n_{m} \approx 16$ phonons being realized at an elevated fridge temperature of $T_f = 211$~mK.

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Paul B. Dieterle, Mahmoud Kalaee, Johannes Fink, Oskar Painter. 2016-01-15. Superconducting cavity-electromechanics on silicon-on-insulator. https://arxiv.org/abs/1601.04019

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