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Updated: Oct 18, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Sub-Kelvin Feedback Cooling and Heating Dynamics of an Optically Levitated Librator
Fons van der Laan1, Felix Tebbenjohanns1, René Reimann1,2
1Photonics Laboratory, ETH Zürich, 8093 Zürich, Switzerland.
Abstract:
Rotational optomechanics strives to gain quantum control over mechanical rotors by harnessing the interaction of light and matter. We optically trap a dielectric nanodumbbell in a linearly polarized laser field, where the dumbbell represents a nanomechanical librator. Using measurement-based parametric feedback control in high vacuum, we cool this librator from room temperature to 240 mK and investigate its heating dynamics when released from feedback. We exclude collisions with residual gas molecules as well as classical laser noise as sources of heating. Our findings indicate that we observe the torque fluctuations arising from the zero-point fluctuations of the electromagnetic field.
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