Entanglement and correlation in anisotropic quantum spin systems -: art. no. 032318

被引：90

作者：

Glaser, U ^{[1
]}

Büttner, H

Fehske, H

机构：

[1] ETH, Integrated Syst Lab, CH-8092 Zurich, Switzerland

[2] Infineon Technol, CL DAT LIB IO, D-81541 Munich, Germany

[3] Univ Bayreuth, D-95440 Bayreuth, Germany

[4] Ernst Moritz Arndt Univ Greifswald, Inst Phys, D-17487 Greifswald, Germany

来源：

PHYSICAL REVIEW A | 2003年 / 68卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.68.032318

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Analytical expressions for the entanglement measures concurrence, i-concurrence, and 3-tangle in terms of spin correlation functions are derived using general symmetries of the quantum spin system. These relations are exploited for the one-dimensional XXZ model, in particular the concurrence and the critical temperature for disentanglement are calculated for finite systems with up to six qubits. A recent NMR quantum error correction experiment is analyzed within the framework of the proposed theoretical approach.

引用

页数：8

共 37 条

[1]

[Anonymous], 1998, QUANTPH0011036

[2] Natural thermal and magnetic entanglement in the 1D Heisenberg model [J].