High-Contrast Interference of Ultracold Fermions

Many-body interference between indistinguishable particles can give rise to strong correlations rooted in quantum statistics. We study such Hanbury Brown-Twiss-type correlations for number states of ultracold massive fermions. Using deterministically prepared ^{6}Li atoms in optical tweezers, we mea...

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Veröffentlicht in:Physical review letters 2019-04, Vol.122 (14), p.143602-143602, Article 143602
Hauptverfasser: Preiss, Philipp M, Becher, Jan Hendrik, Klemt, Ralf, Klinkhamer, Vincent, Bergschneider, Andrea, Defenu, Nicolò, Jochim, Selim
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Sprache:eng
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Zusammenfassung:Many-body interference between indistinguishable particles can give rise to strong correlations rooted in quantum statistics. We study such Hanbury Brown-Twiss-type correlations for number states of ultracold massive fermions. Using deterministically prepared ^{6}Li atoms in optical tweezers, we measure momentum correlations using a single-atom sensitive time-of-flight imaging scheme. The experiment combines on-demand state preparation of highly indistinguishable particles with high-fidelity detection, giving access to two- and three-body correlations in fields of fixed fermionic particle number. We find that pairs of atoms interfere with a contrast close to 80%. We show that second-order density correlations arise from contributions from all two-particle pairs and detect intrinsic third-order correlations.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.143602