Optimal entanglement witnesses for qubits and qutrits

被引：61

作者：

Bertlmann, RA ^{[1
]}

Durstberger, K ^{[1
]}

Hiesmayr, BC ^{[1
]}

Krammer, P ^{[1
]}

机构：

[1] Univ Vienna, Inst Theoret Phys, A-1090 Vienna, Austria

来源：

PHYSICAL REVIEW A | 2005年 / 72卷 / 05期

关键词：

D O I：

10.1103/PhysRevA.72.052331

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the connection between the Hilbert-Schmidt measure of entanglement (that is the minimal distance of an entangled state to the set of separable states) and entanglement witness in terms of a generalized Bell inequality which distinguishes between entangled and separable states. A method for checking the nearest separable state to a given entangled one is presented. We illustrate the general results by considering isotropic states, in particular two-qubit and two-qutrit states-and their generalizations to arbitrary dimensions-where we calculate the optimal entanglement witnesses explicitly.

引用

页数：9

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