Does large quantum Fisher information imply Bell correlations?

被引：21

作者：

Froewis, Florian ^{[1
]}

Fadel, Matteo ^{[2
]}

Treutlein, Philipp ^{[2
]}

Gisin, Nicolas ^{[1
]}

Brunner, Nicolas ^{[1
]}

机构：

[1] Univ Geneva, Dept Appl Phys, CH-1211 Geneva, Switzerland

[2] Univ Basel, Dept Phys, Klingelbergstr 82, CH-4056 Basel, Switzerland

来源：

PHYSICAL REVIEW A | 2019年 / 99卷 / 04期

基金：

瑞士国家科学基金会;

关键词：

ENTANGLEMENT;

D O I：

10.1103/PhysRevA.99.040101

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：4

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