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PreprintCC BY 4.0arXiv

Multi-copy and Catalytic Superactivation of Genuine Multipartite Nonlocality

  • Bora Ulu
  • Mirjam Weilenmann
  • Nicolas Brunner
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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.

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Cite

BibTeXRIS
BibTeX
@misc{ulu2026multicopy,
  title = {{Multi-copy and Catalytic Superactivation of Genuine Multipartite Nonlocality}},
  author = {Bora Ulu and Mirjam Weilenmann and Nicolas Brunner},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.07380},
  eprint = {2609.07380},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.07380},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Multi-copy and Catalytic Superactivation of Genuine Multipartite Nonlocality
AU  - Bora Ulu
AU  - Mirjam Weilenmann
AU  - Nicolas Brunner
PY  - 2026
DA  - 2026/09/07
PB  - arXiv
DO  - 10.48550/arxiv.2609.07380
UR  - https://arxiv.org/abs/2609.07380
AB  - 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.
ER  -