Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Gases (Fermions) III

Q 48.5: Talk

Wednesday, March 7, 2018, 15:00–15:15, K 1.022

Detection of Entanglement in a Fermi-Hubbard Dimer — •Andrea Bergschneider, Vincent Klinkhamer, Ralf Klemt, Jan Hendrik Becher, Gerhard Zürn, Philipp Preiss, and Selim Jochim — Physikalisches Institut, Universität Heidelberg, 69120 Heidelberg

Entanglement is a defining feature of quantum many-body states and can be used to characterize quantum phases. In itinerant systems, where entanglement emerges naturally through coherent particle motion and interactions, it is notoriously challenging to detect experimentally.

We probe the presence of entanglement in the fundamental unit cell of the Fermi-Hubbard model. Using fermionic Lithium 6 in optical microtraps, we deterministically realize quantum states in a tunable double-well potential. These states are characterized by their spin- and particle resolved correlation functions in position and in momentum space. We observe strong correlations in both degrees of freedom, indicating the high coherence of the two-particle system. We establish witness criteria to certify the presence of entanglement in the Fermi-Hubbard dimer and separately observe the emergence of entanglement between modes and between particles.