Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 7: Ultracold Matter II – Bosons (joint session Q/A)

Q 7.5: Vortrag

Montag, 2. März 2026, 18:00–18:15, P 2

How to seed ergodic dynamics of interacting bosons under conditions of many-body quantum chaos — Lukas Pausch^1,2, Edoardo G. Carnio^3,4, Andreas Buchleitner^3,4, and •Alberto Rodríguez^5,6 — ¹Institut de Physique Nucléaire, Atomique et de Spectroscopie, CESAM, Université de Liège, B-4000 Liège, Belgium — ²Present address: German Aerospace Center, Institute of Quantum Technologies, D-89081 Ulm, Germany — ³Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany — ⁴EUCOR Centre for Quantum Science and Quantum Computing, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany — ⁵Departamento de Física Fundamental, Universidad de Salamanca, E-37008 Salamanca, Spain — ⁶Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de Salamanca, E-37008 Salamanca, Spain

We demonstrate how the initial state of ultracold atoms in an optical lattice controls the emergence of ergodic dynamics as the underlying spectral structure is tuned into the quantum chaotic regime. Distinct initial states’ chaos threshold values in terms of tunneling as compared to interaction strength are identified, as well as dynamical signatures of the chaos transition, on the level of experimentally accessible observables and time scales [1]. 1mm [1] L. Pausch, E. G. Carnio, A. Buchleitner, A. Rodríguez, Rep. Prog. Phys. 88(5), 057602 (2025).

Keywords: Many-body quantum chaos; Interacting bosons; Ergodicity; Quantum dynamics