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Does large quantum Fisher information imply Bell correlations?

Fadel, Matteo
Treutlein, Philipp
Published in Physical Review. A. 2019, vol. 99, no. 040101(R)
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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FROEWIS, Florian et al. Does large quantum Fisher information imply Bell correlations?. In: Physical Review. A, 2019, vol. 99, n° 040101(R). doi: 10.1103/PhysRevA.99.040101 https://archive-ouverte.unige.ch/unige:127280

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Deposited on : 2019-12-03

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