Journal
NEW JOURNAL OF PHYSICS
Volume 14, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/14/9/093039
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Funding
- Austrian Science Fund (FWF) [P20748-N16, P24273-N16, SFB F40-FoQus F4012-N16]
- European Union (NAMEQUAM)
- Austrian Science Fund (FWF) [P20748] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 24273, P 20748] Funding Source: researchfish
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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.
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