Single-atom-resolved probing of lattice gases in momentum space
Measuring the full distribution of individual particles is of fundamental importance to characterize many-body quantum systems through correlation functions at any order. Here we demonstrate the possibility to reconstruct the momentum-space distribution of three-dimensional interacting lattice gases...
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| creator | Cayla, Hugo Carcy, Cécile Bouton, Quentin Chang, Rockson Carleo, Giuseppe Mancini, Marco Clément, David |
| description | Measuring the full distribution of individual particles is of fundamental importance to characterize many-body quantum systems through correlation functions at any order. Here we demonstrate the possibility to reconstruct the momentum-space distribution of three-dimensional interacting lattice gases atom-by-atom. This is achieved by detecting individual metastable Helium atoms in the far-field regime of expansion, when released from an optical lattice. We benchmark our technique with Quantum Monte-Carlo calculations, demonstrating the ability to resolve momentum distributions of superfluids occupying \(10^5\) lattice sites. It permits a direct measure of the condensed fraction across phase transitions, as we illustrate on the superfluid-to-normal transition. Our single-atom-resolved approach opens a new route to investigate interacting lattice gases through momentum correlations. |
| doi_str_mv | 10.48550/arxiv.1710.08392 |
| format | Article |
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Here we demonstrate the possibility to reconstruct the momentum-space distribution of three-dimensional interacting lattice gases atom-by-atom. This is achieved by detecting individual metastable Helium atoms in the far-field regime of expansion, when released from an optical lattice. We benchmark our technique with Quantum Monte-Carlo calculations, demonstrating the ability to resolve momentum distributions of superfluids occupying \(10^5\) lattice sites. It permits a direct measure of the condensed fraction across phase transitions, as we illustrate on the superfluid-to-normal transition. 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| subjects | Fluids Helium Helium atoms Lattice sites Momentum Monte Carlo simulation Optical lattices Phase transitions Physics - Atomic Physics Physics - Quantum Gases Superfluidity |
| title | Single-atom-resolved probing of lattice gases in momentum space |
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