High-Contrast Interference of Ultracold Fermions

Year: 2019

Authors: Preiss P.M., Becher J.H., Klemt R., Klinkhamer V., Bergschneider A., Defenu N., Jochim S.

Autors Affiliation: Heidelberg Univ, Phys Inst, D-69120 Heidelberg, Germany; Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany; Swiss Fed Inst Technol, Inst Quantum Elect, CH-8093 Zurich, Switzerland.

Abstract: 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 Li-6 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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 122 (14)      Pages from: 143602-1  to: 143602-6

More Information: We thank M. Garttner, P. Hauke, C. Westbrook, and G. Zurn for insightful discussions. This work has been supported by ERC consolidator Grant No. 725636, DFG Grant No. JO970/1-1, the Heidelberg Center for Quantum Dynamics, and DFG Collaborative Research Centre Grant No. SFB 1225 (ISOQUANT). A. B. acknowledges funding from the International Max-Planck Research School (IMPRS-QD). P. M. P. acknowledges funding from the EU Horizon 2020 program under Marie SklodowskaCurie Grant Agreement No. 706487 and the Daimler and Benz Foundation.
KeyWords: Hanbury-brown; Interferometry
DOI: 10.1103/PhysRevLett.122.143602

Citations: 29
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