Remote sensing of a levitated superconductor with a flux-tunable microwave cavity
Abstract
We present a cavity-electromechanical system comprising a superconducting quantum interference device which is embedded in a microwave resonator and coupled via a pick-up loop to a 6 μg magnetically-levitated superconducting sphere. The motion of the sphere in the magnetic trap induces a frequency shift in the SQUID-cavity system. We use microwave spectroscopy to characterize the system, and we demonstrate that the electromechanical interaction is tunable. The measured displacement sensitivity of 10-7 \, m / Hz, defines a path towards ground-state cooling of levitated particles with Planck-scale masses at millikelvin environment temperatures.
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