Measures of macroscopicity for quantum spin systems
Quantum Physics
2012-09-28 v2
Abstract
We investigate the notion of "macroscopicity" in the case of large quantum spin systems and provide two main results. First, we motivate the Fisher information as a measure for the macroscopicity of quantum states. Second, we compare the existing literature of 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.
Cite
@article{arxiv.1205.3048,
title = {Measures of macroscopicity for quantum spin systems},
author = {Florian Fröwis and Wolfgang Dür},
journal= {arXiv preprint arXiv:1205.3048},
year = {2012}
}
Comments
Comments are welcome! v2: Minor improvements of the text