Journal
PHYSICAL REVIEW A
Volume 99, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.99.040101
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Funding
- European ERC-AG MEC
- Swiss National Science Foundation (Starting grant DIAQ)
- Swiss National Science Foundation (NCCR-QSIT)
- Swiss National Science Foundation [20020_169591]
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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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