Multi-mode feedback cooling of the collective modes of a Bose-Einstein condensate

• URL: http://arxiv.org/abs/2506.19739v1
• Date: Tue, 24 Jun 2025 15:56:55 GMT
• Title: Multi-mode feedback cooling of the collective modes of a Bose-Einstein condensate
• Authors: Ryan J. Thomas, Jordan A. McMahon, Zain Mehdi, Stuart S. Szigeti, Simon A. Haine, Samuel Legge, John D. Close, Joseph J. Hope,
• Abstract summary: We experimentally demonstrate cavity-free feedback cooling of the three lowest-lying collective modes of a Bose-Einstein condensate in a prolate harmonic trap.<n>We show that we can efficiently damp the dipole modes to a final mean phonon occupancy per atom of $1$.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 \textit{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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