Speaker
Description
Quantum gas microscopes probe quantum many-body lattice states via projective measurements in the occupation basis, enabling access to various density and spin correlations. Phase information, however, cannot be directly obtained in these setups. Here we introduce a phase microscope for quantum gases, which measures the local phase profiles with single lattice-site resolution [1], based on Fourier-space manipulation in a matter-wave microscope [2]. We use the phase microscope to study the coherence properties of an ultracold Bose gas in a two-dimensional optical lattice across the thermal phase transition. Furthermore, we discuss protocols for many-body phase microscope, which will give access to various long-range off-diagonal correlators in experimentally realistic settings, which are highly relevant for characterizing many-body phases such as d-wave superconductors or fractional Chern insulators [3].
References
[1] Brüggenjürgen et al., arXiv:2410.10611 (2024)
[2] Asteria et al., Nature 599, 571-575 (2021)
[3] Weitenberg et al., arXiv:2602.12142 (2026)
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