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arXiv · 2306.09846

Fundamental Limits of Feedback Cooling Ultracold Atomic Gases

Zain Mehdi·Simon A. Haine·Joseph J. Hope·Stuart S. Szigeti
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Abstract

We investigate the fundamental viability of cooling ultracold atomic gases with quantum feedback control. Our study shows that the trade-off between the resolution and destructiveness of optical imaging techniques imposes constraints on the efficacy of feedback cooling, and that rapid rethermalization is necessary for cooling thermal gases. We construct a simple model to determine the limits to feedback cooling set by the visibility of density fluctuations, measurement-induced heating, and three-body atomic recombination. We demonstrate that feedback control can rapidly cool high-temperature thermal clouds in quasi-2D geometries to degenerate temperatures with minimal atom loss compared to traditional evaporation. Our analysis confirms the feasibility of feedback cooling ultracold atomic gases, providing a pathway to new regimes of cooling not achievable with current approaches.

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Zain Mehdi, Simon A. Haine, Joseph J. Hope, Stuart S. Szigeti. 2023-06-16. Fundamental Limits of Feedback Cooling Ultracold Atomic Gases. https://doi.org/10.1103/physrevlett.133.073401

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