A phase microscope for quantum gases

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• Prof Christof Weitenberg, TU Dortmund
• Tuesday 23 September 2025, 14:00-15:00
• Ray Dolby Centre, 2nd floor seminar room, PHY-RDC B2.002 .

If you have a question about this talk, please contact Dr Ulrich Schneider.

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 [1]. To infer the phase coherence and phase fluctuation profile, we use direct matter-wave imaging [2] 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.

[1] J. C. Brüggenjürgen, M. S. Fischer, C. Weitenberg, A phase microscope for quantum gases, arXiv:2410.10611 (2024). [2] L. Asteria, H. P. Zahn, M. N. Kosch, K. Sengstock, C. Weitenberg, Quantum gas magnifier for sub-lattice-resolved imaging of 3D quantum systems, Nature 599, 571–575 (2021).

This talk is part of the AMOP list series.

This talk is included in these lists:

• AMOP list
• All Cavendish Laboratory Seminars
• All Talks (aka the CURE list)
• Centre for Health Leadership and Enterprise
• Featured lists
• ME Seminar
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• Ray Dolby Centre, 2nd floor seminar room, PHY-RDC B2.002
• School of Physical Sciences
• Thin Film Magnetic Talks

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