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Does large quantum Fisher information imply Bell correlations?

Date Issued
2019-01-01
Author(s)
Froewis, Florian
Fadel, Matteo  
Treutlein, Philipp  
Gisin, Nicolas
Brunner, Nicolas
DOI
10.1103/physreva.99.040101
Abstract
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.
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