Enhancement of pairwise entanglement via Z2 symmetry breaking

被引：31

作者：

Osterloh, Andreas

Palacios, Guillaume

Montangero, Simone

机构：

[1] Leibniz Univ Hannover, Inst Theoret Phys, D-30167 Hannover, Germany

[2] NEST CNR INFM, I-56126 Pisa, Italy

[3] Scuola Normale Super Pisa, I-56126 Pisa, Italy

[4] Univ Karlsruhe, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.97.257201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the effect of symmetry breaking in a quantum phase transition on pairwise entanglement in spin-1/2 models. We give a set of conditions on correlation functions a model has to meet in order to keep the pairwise entanglement unchanged by a parity symmetry breaking. It turns out that all mean-field solvable models do meet this requirement, whereas the presence of strong correlations leads to a violation of this condition. This results in an order-induced enhancement of entanglement, and we report on two examples where this takes place.

引用

页数：4

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