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arxiv: 1810.01330 · v3 · submitted 2018-10-02 · 🪐 quant-ph

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Does a large quantum Fisher information imply Bell correlations?

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classification 🪐 quant-ph
keywords bellquantumstatescorrelationsinequalityfisherinformationlarge
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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.

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