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Published September 2, 2010 | Supplemental Material + Submitted
Journal Article Open

Single-atom-resolved fluorescence imaging of an atomic Mott insulator

Abstract

The reliable detection of single quantum particles has revolutionized the field of quantum optics and quantum information processing. For several years, researchers have aspired to extend such detection possibilities to larger-scale, strongly correlated quantum systems, in order to record in situ images of a quantum fluid in which each underlying quantum particle is detected. Here we report fluorescence imaging of strongly interacting bosonic Mott insulators in an optical lattice with single-atom and single-site resolution. From our images, we fully reconstruct the atom distribution on the lattice and identify individual excitations with high fidelity. A comparison of the radial density and variance distributions with theory provides a precise in situ temperature and entropy measurement from single images. We observe Mott-insulating plateaus with near-zero entropy and clearly resolve the high-entropy rings separating them, even though their width is of the order of just a single lattice site. Furthermore, we show how a Mott insulator melts with increasing temperature, owing to a proliferation of local defects. The ability to resolve individual lattice sites directly opens up new avenues for the manipulation, analysis and applications of strongly interacting quantum gases on a lattice. For example, one could introduce local perturbations or access regions of high entropy, a crucial requirement for the implementation of novel cooling schemes.

Additional Information

©2010 Macmillan Publishers Limited. Received 17 June; accepted 27 July 2010. Published online 18 August 2010. We thank R. Glöckner and R. Labouvie for assistance during the set-up of the experiment and S. Trotzky for discussions. We acknowledge funding by the MPG, the DFG, the Stiftung Rheinland-Pfalz für Innovation, the Carl-Zeiss Stiftung, the EU (NAMEQUAM, AQUTE and Marie Curie fellowships to J.F.S. and M.C.). Author Contributions: All authors contributed to the construction of the apparatus, acquisition and analysis of the data, and the writing of this manuscript. The authors declare no competing financial interests.

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Submitted - 1006.3799v2.pdf

Supplemental Material - nature09378-s1.pdf

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August 19, 2023
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