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Date
2020Type
- Journal Article
Citations
Cited 23 times in
Web of Science
Cited 23 times in
Scopus
ETH Bibliography
yes
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Abstract
The possibility of Bell inequality violations in quantum theory had a profound impact on our understanding of the correlations that can be shared by distant parties. Generalizing the concept of Bell nonlocality to networks leads to novel forms of correlations, the characterization of which is, however, challenging. Here, we investigate constraints on correlations in networks under the natural assumptions of no-signaling and independence of the sources. We consider the triangle network with binary outputs, and derive strong constraints on correlations even though the parties receive no input, i.e., each party performs a fixed measurement. We show that some of these constraints are tight, by constructing explicit local models (i.e. where sources distribute classical variables) that can saturate them. However, we also observe that other constraints can apparently not be saturated by local models, which opens the possibility of having nonlocal (but non-signaling) correlations in the triangle network with binary outputs. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000416216Publication status
publishedExternal links
Journal / series
Nature CommunicationsVolume
Pages / Article No.
Publisher
Nature Publishing GroupMore
Show all metadata
Citations
Cited 23 times in
Web of Science
Cited 23 times in
Scopus
ETH Bibliography
yes
Altmetrics