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.
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页数：4
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