Multi-copy and Catalytic Superactivation of Genuine Multipartite Nonlocality

Abstract:Genuine multipartite Bell nonlocality (GMNL) aims at capturing correlations between many distant observers that are globally Bell nonlocal. A commonly used definition for GMNL is based on biseparable models constructed from non-signalling correlations. Here we uncover an effect of superactivation of GMNL in this framework. Specifically, by locally wiring together two copies of a biseparable correlation, i.e. not GMNL, one can obtain another correlation that is GMNL. We show that this is possible for any number of parties, and for quantum-realizable correlations. Finally, we show that superactivation of GMNL is also possible at the single-copy level, via a catalytic protocol involving only local wirings. These results question the operational meaning of this definition of GMNL.

arXiv:2609.07380 [quant-ph]

(or arXiv:2609.07380v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.07380 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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