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

Philip Schmidt; Remi Claessen; Gerard Higgins; Joachim Hofer; Jannek J. Hansen; Peter Asenbaum; Martin Zemlicka; Kevin Uhl; Reinhold Kleiner; Rudolf Gross; Hans Huebl; Michael Trupke; Markus Aspelmeyer

doi:10.1103/PhysRevApplied.22.014078

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

Philip Schmidt, Remi Claessen, Gerard Higgins, Joachim Hofer, Jannek J. Hansen, Peter Asenbaum, Martin Zemlicka, Kevin Uhl, Reinhold Kleiner, Rudolf Gross, Hans Huebl, Michael Trupke, Markus Aspelmeyer

DOI 10.1103/PhysRevApplied.22.014078 · Physical Review Applied

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Abstract

We present a cavity-electromechanical system comprising a superconducting quantum interference device which is embedded in a microwave resonator and coupled via a pickup 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 10−7m/Hz defines a path towards ground-state cooling of levitated particles with Planck-scale masses at millikelvin environment temperatures.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb-Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown