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Entanglement Theory Quantum Correlations Quantum Foundations

All Entangled States are Nonlocal and Self-Testable in the Broadcast Scenario

arXiv
Authors: Pavel Sekatski, Jef Pauwels

Year

2025

Paper ID

5981

Status

Preprint

Abstract Read

~2 min

Abstract Words

113

Citations

N/A

Abstract

Entanglement and Bell nonlocality are known to be inequivalent: there exist entangled states that admit a local hidden-variable model for all local measurements. Here we show that this gap disappears in a minimal broadcast extension of the Bell scenario. Assuming only the validity of quantum theory, we prove that for every entangled state ρAB there exist local broadcasting maps and local measurements such that the resulting four--partite correlations cannot be reproduced by any broadcast network whose source is separable across the A|B cut. Thus, all entangled states are broadcast nonlocal in quantum theory. In addition, we show that all (also mixed) multipartite states can be broadcast-self-tested, according to a natural operational definition.

Why This Paper Matters

  • This paper contributes to the Quantum Foundations research area in the Quantum Articles archive.
  • It adds a 2025 reference point for readers tracking recent quantum research.
  • Entanglement and Bell nonlocality are known to be inequivalent: there exist entangled states that admit a local hidden-variable model for all local measurements.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2512.15656 [2] arXiv https://arxiv.org/abs/2512.15656 [3] Publisher https://arxiv.org/abs/2512.15656

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