Multipartite entanglement in quantum spin chains

被引：65

作者：

Bruss, D ^{[1
]}

Datta, N

Ekert, A

Kwek, LC

Macchiavello, C

机构：

[1] Univ Dusseldorf, Inst Theoret Phys, D-40225 Dusseldorf, Germany

[2] Univ Cambridge, DPMMS, Stat Lab, Cambridge CB3 0WB, England

[3] Univ Cambridge, DAMTP, Ctr Quantum Computat, Cambridge CB3 0WB, England

[4] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[5] Nanyang Technol Univ, NIE, Dept Nat Sci, Singapore 637616, Singapore

[6] Dipartimento Fis A Volta, I-27100 Pavia, Italy

[7] Univ Pavia, INFM, I-27100 Pavia, Italy

来源：

PHYSICAL REVIEW A | 2005年 / 72卷 / 01期

关键词：

D O I：

10.1103/PhysRevA.72.014301

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the occurrence of multipartite entanglement in spin chains. We show that certain genuine multipartite entangled states, namely W states, can be obtained as ground states of simple XX type ferromagnetic spin chains in a transverse magnetic field, for any number of sites. Moreover, multipartite entanglement is proven to exist even at finite temperatures. A transition from a product state to a multipartite entangled state occurs when decreasing the magnetic field to a critical value. Adiabatic passage through this point can thus lead to the generation of multipartite entanglement.

引用

页数：4

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