Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 78: Quantum Optics and Control III

Q 78.7: Talk

Friday, March 6, 2026, 16:00–16:15, P 3

Distinguishability-induced many-body decoherence — •Christoph Dittel^1,2,3,4 and Andreas Buchleitner^1,2 — ¹Physikalisches Institut, Albert-Ludwigs-Universität, 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 — ³Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstraße 19, 79104 Freiburg, Germany — ⁴Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden

We show that many-body interference phenomena are exponentially suppressed in the particle number, if the identical quantum objects brought to interference acquire a finite level of distinguishability through statistical mixing of some internal, unobserved degrees of freedom. We discuss consequences for cold atom and photonic circuitry experiments.

Keywords: Many-body interference; Partial distiguishability; Many-body decoherence