Quantum nonlocality. Detecting nonlocality in many-body quantum states

Intensive studies of entanglement properties have proven essential for our understanding of quantum many-body systems. In contrast, much less is known about the role of quantum nonlocality in these systems because the available multipartite Bell inequalities involve correlations among many particles...

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Published in:Science (American Association for the Advancement of Science) 2014-06, Vol.344 (6189), p.1256-1258
Main Authors: Tura, J, Augusiak, R, Sainz, A B, Vértesi, T, Lewenstein, M, Acín, A
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Language:English
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container_title Science (American Association for the Advancement of Science)
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creator Tura, J
Augusiak, R
Sainz, A B
Vértesi, T
Lewenstein, M
Acín, A
description Intensive studies of entanglement properties have proven essential for our understanding of quantum many-body systems. In contrast, much less is known about the role of quantum nonlocality in these systems because the available multipartite Bell inequalities involve correlations among many particles, which are difficult to access experimentally. We constructed multipartite Bell inequalities that involve only two-body correlations and show how they reveal the nonlocality in many-body systems relevant for nuclear and atomic physics. Our inequalities are violated by any number of parties and can be tested by measuring total spin components, opening the way to the experimental detection of many-body nonlocality, for instance with atomic ensembles.
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title Quantum nonlocality. Detecting nonlocality in many-body quantum states
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