Remote sensing of a levitated superconductor with a flux-tunable microwave cavity
arxiv(2024)
摘要
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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