SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Gases: Bosons II
Q 20.2: Talk
Tuesday, March 7, 2023, 11:15–11:30, F342
Many-body interference at the onset of chaos — Eric Brunner1,2, Lukas Pausch1,2,3, Edoardo G. Carnio1,2, •Gabriel Dufour1,2, Alberto Rodríguez4, and Andreas Buchleitner1,2 — 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104, Freiburg, Germany — 2EUCOR Centre for Quantum Science and Quantum Computing, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104, Freiburg, Germany — 3CESAM Research Unit, University of Liège, 4000 Liège, Belgium — 4Departamento de Física Fundamental, Universidad de Salamanca, E-37008 Salamanca, Spain
We unveil the signature of many-body interference across dynamical regimes of the Bose-Hubbard model. Increasing the particles' indistinguishability enhances the temporal fluctuations of few-body observables, with a dramatic amplification at the onset of quantum chaos. By resolving the exchange symmetries of partially distinguishable particles, we explain this amplification as the fingerprint of the initial state's coherences in the energy eigenbasis. In the domain of fully developed quantum chaos, ergodic delocalisation of the eigenstates suppresses this fingerprint.