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Entanglement Theory Quantum Correlations Quantum Foundations

Superactivation of genuine multipartite Bell nonlocality from two-party entanglement

arXiv
Authors: Markus Miethlinger, Riccardo Castellano, Pavel Sekatski, Nicolas Brunner

Year

2026

Paper ID

30620

Status

Preprint

Abstract Read

~2 min

Abstract Words

104

Citations

N/A

Abstract

Characterizing the relation between entanglement and Bell nonlocality is a long-standing open problem, notably challenging in the multipartite case. Here we investigate the effect of superactivation of genuine multipartite nonlocality. Specifically, we show that starting from multipartite states that feature only two-party entanglement (hence almost fully separable), it is possible to obtain GMNL in the many-copy regime. This represents the weakest possible resource for GMNL superactivation. On the technical side, we develop an efficient and practical criterion for certifying GMNL superactivation based on network entangled states, as well as a perfect parallel repetition result for the Khot-Vishnoi Bell game, which are of independent interest.

Why This Paper Matters

  • This paper contributes to the Quantum Foundations research area in the Quantum Articles archive.
  • It adds a 2026 reference point for readers tracking recent quantum research.
  • Characterizing the relation between entanglement and Bell nonlocality is a long-standing open problem, notably challenging in the multipartite case.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2603.17783 [2] arXiv https://arxiv.org/abs/2603.17783 [3] Publisher https://arxiv.org/abs/2603.17783

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