Does a large quantum Fisher information imply Bell correlations?
Quantum Physics
2019-05-03 v3
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.
Cite
@article{arxiv.1810.01330,
title = {Does a large quantum Fisher information imply Bell correlations?},
author = {Florian Fröwis and Matteo Fadel and Philipp Treutlein and Nicolas Gisin and Nicolas Brunner},
journal= {arXiv preprint arXiv:1810.01330},
year = {2019}
}
Comments
4 pages, minor edits