Linking measures for macroscopic quantum states via photon-spin mapping

OPTICS COMMUNICATIONS

卷:337

Article

Froewis, F.¹  Sangouard, N.^1,2  Gisin, N.¹ 

[1] Univ Geneva, Grp Appl Phys, CH-1211 Geneva 4, Switzerland

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

关键词: Macroscopicity;    Quantunmess;    Measure;    Schrobdinger-cat states;   

DOI  :  10.1016/j.optcom.2014.07.017

来源: Elsevier

【 摘 要 】

We review and compare several measures that identify quantum states that are macroscopically quantum. These measures were initially formulated either for photonic systems or for spin ensembles. Here, we compare them through a simple model which maps photonic states to spin ensembles. On one hand, we reveal problems for some spin measures to handle correctly photonic states that typically are considered to be macroscopically quantum. On the other hand, we find significant similarities between other measures even though they were differently motivated. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free