Quantum disentanglement in long-range orders and spontaneous symmetry breaking

被引：18

作者：

Shi, Y ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[2] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 0WA, England

来源：

PHYSICS LETTERS A | 2003年 / 309卷 / 3-4期

关键词：

disentanglement; entanglement; long-range order; spontaneous symmetry breaking;

D O I：

10.1016/S0375-9601(03)00128-2

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the nature of quantum entanglement in long-range orders and spontaneous symmetry breaking. It is shown that diminishing of entanglement between the condensate mode and the rest of the system underlies off-diagonal long-range order, which is the hallmark of superconductivity and Bose-Einstein condensation. It is also revealed that disentanglement underlies various cases of long-range order and spontaneous symmetry breaking. In the course of the discussion, we also present some ideas on characterizing entanglement in many-body systems. Especially, it is shown how the connected correlation functions can be used in characterizing entanglements in a pure state. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：254 / 261

页数：8

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