Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 78: Quantum Optics and Control III

Q 78.5: Talk

Friday, March 6, 2026, 15:30–15:45, P 3

Spectral signatures of dissipative quantum chaos induced by structured internal degrees of freedom — •Morgan Berkane, Gabriel Dufour, and Andreas Buchleitner — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104, Freiburg, Germany

Chaos plays a central role in the coherence properties of many-particle quantum systems. In particular, decoherence arises when the internal degrees of freedom of the particles are not exactly identical and become (partially) distinguishable. In this work, we study the emergence of dissipative quantum chaos in a two-level system that is non-chaotic in isolation but coupled to a set of structured internal modes. We examine how chaotic internal modes degrade Hong-Ou-Mandel interference and thus generate particle distinguishability. Our results demonstrate that spectral chaos in inaccessible internal degrees of freedom can leave measurable traces in open quantum dynamics and quantum interference experiments.

Keywords: distinguability; chaos; master equation; Hong-Ou-Mandel; decoherence