Does large quantum Fisher information imply Bell correlations?

Froewis, Florian and Fadel, Matteo and Treutlein, Philipp and Gisin, Nicolas and Brunner, Nicolas. (2019) Does large quantum Fisher information imply Bell correlations? Physical Review A, 99 (4). 040101.

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Official URL: https://edoc.unibas.ch/73823/

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The quantum Fisher information (QFI) of certain multipartite entangled quantum states is larger than what is reachable by separable states, providing a metrological advantage. Are these nonclassical correlations strong enough to potentially violate a Bell inequality? Here, we present evidence from two examples. First, we discuss a Bell inequality designed for spin-squeezed states which is violated only by quantum states with a large QFI. Second, we relax a well-known lower bound on the QFI to find the Mermin Bell inequality as a special case. However, a fully general link between QFI and Bell correlations is still open.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentelle Nanophysik (Treutlein)
UniBasel Contributors:Treutlein, Philipp and Fadel, Matteo
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article -- Additional publication or translation in: http://arxiv.org/abs/1810.01330
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Last Modified:16 Apr 2020 07:55
Deposited On:16 Apr 2020 07:55

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