Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 13: Posters: Quantum Optics and Photonics I

Q 13.10: Poster

Monday, March 9, 2020, 16:30–18:30, Empore Lichthof

Probing entanglement in many-body systems — •Julian Léonard, Robert Schittko, Sooshin Kim, Joyce Kwan, and Markus Greiner — Harvard University, Cambridge, MA, USA

Entanglement is one of the most intriguing features of quantum mechanics. It describes non-local correlations between quantum objects, and it is at the heart of quantum information sciences. In a many-body system, the entanglement can reveal key properties of the underlying physics, which are elusive to other observables.

Here, we elucidate the entanglement properties in different pure quantum states far from equilibrium by measuring a number of entanglement quantities. Firstly, we study the dynamics in a Luttinger liquid after a quantum quench. We observe the formation of bipartite entanglement through the spreading of quasi-particles, which give access to the system's Luttinger parameter. Secondly, we prepare a strongly disordered Bose-Hubbard system far from equilibrium. We identify the emergence of many-body localization by the logarithmically slow formation of entanglement in the system. Finally, we study the weakly disordered Bose-Hubbard system, and identify a spatially separated, sparse-resonant structure, which persists into non-factorizable higher-order correlations.