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Preprint Oct 2026

De Finetti Structures in Networks of Quantum Systems

Consider $N$ identical quantum systems at the vertices of a graph, interacting via pairwise edge couplings. We designate $K$ vertices as a system of interest $\mathrm S$ and the remaining $N-K$ as a reservoir $\mathrm R$. Under generic connectivity assumptions between $\mathrm S$ and $\mathrm R$, we show that for $N\to...

G. Hull, M. Merkli · 0 citations
Preprint Sep 2026

On spatial decoherence in many-body systems

We study the dynamics of a many-body quantum system strongly interacting with a bosonic reservoir. The coupling is given by a potential operator for the system and it is linear in the field. We show that in the limit of infinite coupling strength the system undergoes instantaneous spatial decoherence. To resolve the de...

S. Marcantoni, M. Merkli · 0 citations

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