Entanglement versus chaos in disordered spin chains

被引：91

作者：

Santos, LF ^{[1
]}

Rigolin, G

Escobar, CO

机构：

[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Dept Raios Cosm & Cronol, BR-13084971 Campinas, SP, Brazil

来源：

PHYSICAL REVIEW A | 2004年 / 69卷 / 04期

基金：

美国国家科学基金会; 巴西圣保罗研究基金会;

关键词：

D O I：

10.1103/PhysRevA.69.042304

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We use a Heisenberg spin-1/2 chain to investigate how chaos and localization may affect the entanglement of pairs of qubits. To measure how much entangled a pair is, we compute its concurrence, which is then analyzed in the delocalized (localized) and in the chaotic (nonchaotic) regimes. Our results indicate that chaos reduces entanglement and that entanglement decreases in the region of strong localization. In the transition region from a chaotic to a nonchaotic regime localization increases entanglement. We also show that entanglement is larger for strongly interacting qubits (nearest neighbors) than for weakly interacting qubits (next and next-next neighbors).

引用

页码：042304 / 1

页数：6

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