A phase microscope for quantum gases

• URL: http://arxiv.org/abs/2410.10611v1
• Date: Mon, 14 Oct 2024 15:17:45 GMT
• Title: A phase microscope for quantum gases
• Authors: Justus C. Brüggenjürgen, Mathis S. Fischer, Christof Weitenberg,
• Abstract summary: Coherence properties are central to quantum systems and are at the heart of phenomena such as superconductivity. We study coherence properties of an ultracold Bose gas in a two-dimensional optical lattice across the thermal phase transition.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Coherence properties are central to quantum systems and are at the heart of phenomena such as superconductivity. Here we study coherence properties of an ultracold Bose gas in a two-dimensional optical lattice across the thermal phase transition. To infer the phase coherence and phase fluctuation profile, we use direct matter-wave imaging of higher Talbot revivals as well as a new phase microscope based on a site-resolved mapping of phase fluctuations to density fluctuations during matter-wave imaging. We observe the algebraic decay of the phase correlations in the superfluid phase and a linear temperature increase of the exponent. These techniques will also allow studying coherence properties in strongly-correlated quantum systems with full spatial resolution.

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