Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Quantum Gases (Fermions) I

Q 35.6: Talk

Wednesday, March 13, 2019, 15:30–15:45, S HS 037 Informatik

High-Contrast Interference of Ultracold Fermions — •Jan Hendrik Becher, Philipp M. Preiss, Ralf Klemt, Vincent Klinkhamer, Andrea Bergschneider, and Selim Jochim — Physics Institute, Heidelberg University, Germany

Many-body interference between indistinguishable particles induces strong correlations rooted in quantum statistic. Such correlations have been studied with few photons but are thus limited to massless, non-interacting systems. Using deterministically prepared fermionic atoms in optical tweezers, such experiments can be extended to a higher particle number and further correlations can be induced by tuning the interactions over a wide range.

In our experiment we assemble mesoscopic fermionic quantum systems from independently prepared optical tweezers. We combine the full control of the system with a single-atom, spin-resolved imaging scheme that allows us to extract momentum correlation functions up to third order.

I will present recent measurements on momentum correlations between three independently prepared, identical fermions. The observed correlations are purely induced by quantum statistics and are a consequence of the particles' indistinguishability. We measure and analyze two and three-body density correlations after time-of-flight and find that even non-interacting, identical fermions exhibit intrinsic three-body correlations that cannot be predicted from measured two-body correlation functions.