Article (Accepted version) (392 Kb) - Free access
Other version: https://link.aps.org/doi/10.1103/PhysRevA.99.040101
Does large quantum Fisher information imply Bell correlations?
|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.|
|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|