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arXiv 0804.1061quant-phcond-mat.stat-mech
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有限温度相变中冯诺伊曼熵的标度

Scaling of the von Neumann entropy across a finite temperature phase transition

Vladislav Popkov, Mario Salerno

摘要:

本文用解析方法得到了在$T=T_c$处发生相变到玻色-爱因斯坦凝聚体凝聚的硬核玻色子系统的约化密度矩阵谱和冯诺伊曼熵(VNE)的温度依赖性.它表明,VNE经历了一个交叉从纯对数在T=0纯线性块大小$n$行为$T\geq T_{c}$。对于中间温度,VNE是两个贡献的总和,这两个贡献被确定为冯诺伊曼熵的经典(吉布斯)和量子(由于纠缠)部分。

英文摘要:

The spectrum of the reduced density matrix and the temperature dependence of the von Neumann entropy (VNE) are analytically obtained for a system of hard core bosons on a complete graph which exhibits a phase transition to a Bose-Einstein condensate at $T=T_c$. It is demonstrated that the VNE undergoes a crossover from purely logarithmic at T=0 to purely linear in block size $n$ behaviour for $T\geq T_{c}$. For intermediate temperatures, VNE is a sum of two contributions which are identified as the classical (Gibbs) and the quantum (due to entanglement) parts of the von Neumann entropy.

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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