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TUE: Tuesday Contributed Sessions
TUE 8: Correlated Quantum Matter: Contributed Session to Symposium I
TUE 8.3: Vortrag
Dienstag, 9. September 2025, 14:45–15:00, ZHG009
A general scheme for detecting phases of lattice-confined ultracold atomic clouds — •Niklas Euler1,2, Christof Weitenberg3, and Martin Gärttner1 — 1Institut für Festkörpertheorie und Optik, FSU Jena, Jena — 2Physikalisches Institut, Universität Heidelberg, Heidelberg — 3Fakultät Physik, TU Dortmund, Dortmund
Over the past decade, quantum-gas microscopes have become an invaluable tool for cold-atom experiments, delivering unprecedented single-site resolution. The now available high-precision density measurements have been used successfully to probe strongly correlated quantum matter, perform quantum simulation tasks, or investigate out-of-equilibrium dynamics, among other applications. However, reconstructing phase distributions of ultracold atomic clouds from matter-wave images has remained challenging, especially for large phase fluctuations. Here, we propose a new measurement scheme that reliably reconstructs initial-state phases and density fluctuations from a single matter-wave inference image in an efficient manner. Our method works by decomposing the initial state into individual spatially localized modes and evolving them independently, which is well justified in the regime of weak nonlinear interactions. Furthermore, by comparing the reconstructed image with measurement data, the plausibility of the resulting distributions can easily be verified. Finally, we show first numerical results, demonstrating that our method is robust under typical experimental conditions.
Keywords: Cold atoms; Microscopy; BEC; Phase fluctuations