Entanglement change of mixed states under canonical unitary operations in two qubits

被引：10

作者：

Wang, CZ ^{[1
]}

Li, CX ^{[1
]}

Guo, GC ^{[1
]}

机构：

[1] Univ Sci & Technol China, Key Labv Quantum Informat, Anhua 230026, Peoples R China

来源：

PHYSICS LETTERS A | 2005年 / 337卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

entanglement; canonical unitaries; maximally entangled mixed states;

D O I：

10.1016/j.physleta.2005.01.057

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate entanglement change of mixed states in a class by applying canonical unitary form of two-qubit unitary operations. The class, including Werner states, Bell diagonal states and maximum entangled mixed states, is characterized by three real parameters and geometrically presented by a tetrahedron. We propose a class of mixed states whose entanglement cannot be increased by any canonical unitary operation. (c) 2005 Elsevier B.V All rights reserved.

引用

页码：29 / 36

页数：8

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