Optical interferometric readout of a magnetically levitated superconducting microsphere
Jannek J. Hansen, Stefan Minniberger, Dominik Ilk, Peter Asenbaum, Gerard Higgins, Rhys G. Povey, Philip Schmidt, Joachim Hofer, Rémi Claessen, Markus Aspelmeyer, Michael Trupke
DOI 10.1103/ljxp-3f66 · Physical Review Applied
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Abstract
We probe the motion of a 6-μg magnetically levitated superconducting microsphere using optical interferometry at 3K, achieving a resolution of the order of 1nm/Hz, and use the measured signal to feedback-cool its motion. The resolution exceeds the shot-noise limit of 11pm/Hz primarily due to technical noise arising from the roughness of the particle, in combination with its free rotation. These measurements demonstrate that the combination of interferometric optical readout and superconducting magnetic levitation, together with established techniques of cavity optomechanics, provides all the ingredients required for quantum physics experiments with microgram masses.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PbSn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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