Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 66: Quantum Effects IV

Q 66.4: Talk

Friday, March 18, 2022, 11:15–11:30, Q-H13

Dynamics of partially distinguishable particles — •Gabriel Dufour, Eric Brunner, Christoph Dittel, and Andreas Buchleitner — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg

A complete description of bosonic and fermionic many-body systems should include any degree of freedom which could, in principle, allow to distinguish the particles. Indeed, even if they do not participate in the dynamics, the existence of such ``labels'' leads to a degradation of many-particle interference in the dynamical degrees of freedom. We show that partial distinguishability can be described in terms of entanglement between dynamical and label degrees of freedom, conditioned by the overall symmetry of the many-particle state. This entanglement suppresses interference contributions to expectation values of many-body observables, which are governed by the coherences of the reduced state of the dynamical degrees of freedom.