Remote sensing of a levitated superconductor with a flux-tunable microwave cavity

• URL: http://arxiv.org/abs/2401.08854v3
• Date: Thu, 1 Aug 2024 09:25:23 GMT
• Title: Remote sensing of a levitated superconductor with a flux-tunable microwave cavity
• Authors: Philip Schmidt, Remi Claessen, Gerard Higgins, Joachim Hofer, Jannek J. Hansen, Peter Asenbaum, Kevin Uhl, Reinhold Kleiner, Rudolf Gross, Hans Huebl, Michael Trupke, Markus Aspelmeyer,
• Abstract summary: A superconducting quantum interference device is embedded in a microwave resonator and coupled via a pick-up loop to a magnetically-levitated superconducting sphere. The motion of the sphere in the magnetic trap induces a frequency shift in the SQUID-cavity system. The measured displacement sensitivity of $10-7, mathrmm / sqrtmathrmHz$, defines a path towards ground-state cooling of levitated particles with Planck-scale masses at millikelvin environment temperatures.
• Score: 0.1662044453232128
• License: http://creativecommons.org/licenses/by/4.0/
• 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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