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arXiv 2103.07480quant-phcond-mat.stat-mechnlin.CDphysics.atom-ph
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相空间中的量子局域化测度

Quantum localization measures in phase space

D. Villaseñor, S. Pilatowsky-Cameo, M. A. Bastarrachea-Magnani, S. Lerma-Hernández, J. G. Hirsch

摘要:

测量量子态在相空间中的局域化程度对于描述量子系统的动力学和平衡是必不可少的,但这一主题远未被理解。没有唯一的方法来测量局域化,并且单独的测量可以反映相同量子态的不同方面。在这里,我们提出了一个一般的计划来定义本地化的措施空间,这是基于我们所谓的雷尼职业,从任何措施的本地化可以得到。我们将这个方案应用到相互作用自旋玻色子Dicke模型的四维无界相空间。特别是,我们做了一个详细的比较两个本地化措施的基础上的Husimi函数在该政权的模型是混乱的,即一个项目的Husimi函数在有限相空间的自旋和另一个使用的Husimi函数定义在经典的能量壳。我们阐明了他们的差异的起源,表明在无界空间的定义最大离域需要一个有界的参考子空间,不同的选择导致上下文的答案。

英文摘要:

Measuring the degree of localization of quantum states in phase space is essential for the description of the dynamics and equilibration of quantum systems, but this topic is far from being understood. There is no unique way to measure localization, and individual measures can reflect different aspects of the same quantum state. Here, we present a general scheme to define localization in measure spaces, which is based on what we call Rényi occupations, from which any measure of localization can be derived. We apply this scheme to the four-dimensional unbounded phase space of the interacting spin-boson Dicke model. In particular, we make a detailed comparison of two localization measures based on the Husimi function in the regime where the model is chaotic, namely one that projects the Husimi function over the finite phase space of the spin and another that uses the Husimi function defined over classical energy shells. We elucidate the origin of their differences, showing that in unbounded spaces the definition of maximal delocalization requires a bounded reference subspace, with different selections leading to contextual answers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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