Measures of macroscopicity for quantum spin systems

被引：104

作者：

Froewis, Florian ^{[1
]}

Duer, Wolfgang ^{[1
]}

机构：

[1] Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria

来源：

NEW JOURNAL OF PHYSICS | 2012年 / 14卷

基金：

奥地利科学基金会;

关键词：

ENTANGLEMENT;

D O I：

10.1088/1367-2630/14/9/093039

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the notion of 'macroscopicity' in the case of quantum spin systems and provide two main results. Firstly, we motivate the quantum Fisher information as a measure of the macroscopicity of quantum states. Secondly, we make a comparison with the existing literature on this topic. We report on a hierarchy among the measures and we conclude that one should carefully distinguish between 'macroscopic quantum states' and 'macroscopic superpositions', which is a strict subclass of the former.

引用

页数：23

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