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 $\mu$g 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 $10^{-7}\mathrm{m}/\sqrt{\mathrm{Hz}}$, defines a path towards ground-state cooling of levitated particles with Planck-scale masses at millikelvin environment temperatures.

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• Maglev for Dark Matter: Dark-photon and axion dark matter sensing with levitated superconductors
• Superconducting Levitated Detector of Gravitational Waves
• First Search for Ultralight Dark Matter Using a Magnetically Levitated Particle
• Superconducting flip-chip devices using indium microspheres on Au-passivated Nb or NbN as under-bump metallization layer
• Characterisation of a levitated sub-mg ferromagnetic cube in a planar alternating-current magnetic Paul trap