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Multimode feedback cooling of the collective modes of a Bose-Einstein condensate

Ryan J. Thomas*, Jordan A. McMahon†, Zain Mehdi, Stuart S. Szigeti, Simon A. Haine, Samuel Legge, John D. Close, and Joseph J. Hope

  • *Contact author: ryan.thomas@anu.edu.au
  • †Present address: Q-CTRL, 93 Shepherd Street, Chippendale, New South Wales 2008, Australia.

Phys. Rev. A 112, L031302 – Published 5 September, 2025

DOI: https://doi.org/10.1103/jzw6-dn5h

Abstract

We experimentally demonstrate cavity-free feedback cooling of the three lowest-lying collective modes of a Bose-Einstein condensate in a prolate harmonic trap. Using shadowgraph imaging as an in situ probe of the atomic density, we measure the time-dependent centers of mass and widths of the condensate in two dimensions and use these measurements to damp oscillations in the two visible dipole modes and the low-frequency quadrupole mode. By inducing oscillations in the condensate, we show that we can efficiently damp the dipole modes to a final mean phonon occupancy per atom of <1.

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