Scientific article
Open access

Full Network Nonlocality

Published inPhysical review letters, vol. 128, no. 1, 010403
Publication date2022-01-07
First online date2022-01-07

Networks have advanced the study of nonlocality beyond Bell's theorem. Here, we introduce the concept of full network nonlocality, which describes correlations that necessitate all links in a network to distribute nonlocal resources. Showcasing that this notion is stronger than standard network nonlocality, we prove that the most well-known network Bell test does not witness full network nonlocality. In contrast, we demonstrate that its generalization to star networks is capable of detecting full network nonlocality in quantum theory. More generally, we point out that established methods for analyzing local and theory- independent correlations in networks can be combined in order to systematically deduce sufficient conditions for full network nonlocality in any network and input-output scenario. We demonstrate the usefulness of these methods by constructing polynomial witnesses of full network nonlocality for the bilocal scenario. Then, we show that these inequalities can be violated via quantum elegant joint measurements.

  • European Commission - Spectral gaps in interacting quantum systems [648913]
Citation (ISO format)
POZAS-KERSTJENS, Alejandro, GISIN, Nicolas, TAVAKOLI, Armin. Full Network Nonlocality. In: Physical review letters, 2022, vol. 128, n° 1, p. 010403. doi: 10.1103/PhysRevLett.128.010403
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Article (Published version)
ISSN of the journal0031-9007

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