# SAMOP 2021 – wissenschaftliches Programm

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# SYAD: Symposium SAMOP Dissertation Prize 2021

## SYAD 1: SAMOP Dissertation Prize

### SYAD 1.2: Hauptvortrag

### Dienstag, 21. September 2021, 11:15–11:45, Audimax

**About the interference of many particles** — •Christoph Dittel — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany

In the coherent evolution of systems of identical particles -- as nowadays routinely dealt with in photonics as well as in cold atom experiments -- the superposition principle is to be applied not only to individual particles, but also to many-particle paths, provided the particles are to some degree indistinguishable and thus lack independent individuality. While such many-particle coherence properties are often referred to as essential features of multi-component quantum systems (including applications such as quantum computing architectures), their implications for the dynamics and counting statistics of many particle quantum systems have so far received only limited attention. Yet, many particle interference can give rise, e.g., to the suppression of numerous many-particle transmission amplitudes, as a distinctive feature of strictly indistinguishable as compared to partially distinguishable particles. We will give a general theory of such suppression of many-particle transmission events. Furthermore, since partial distinguishability of sets of identical particles conveys which-path information -- now on the level of many-particle paths -- to the environment, the systematic analysis of many-particle coherence properties paves the way for a decoherence theory of many-particle quantum systems. A cornerstone of such theory is the generalization of wave-particle duality for many-particle systems, which we will formulate, and illustrate in experimentally relevant contexts.