Measures of macroscopicity for quantum spin systems release_6s4b4e5mpfhctej7ly4ogagp2e

by Florian Fröwis, Wolfgang Dür

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2012  

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.
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Date   2012-05-14
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arXiv  1205.3048v1
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