Local observables for entanglement detection of depolarized states

被引：12

作者：

D'Ariano, GM ^{[1
]}

Macchiavello, C

Paris, MGA

机构：

[1] Ist Nazl Fis Mat, Quantum Opt & Informat Grp, Unita Pavia, I-27100 Pavia, Italy

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

来源：

PHYSICAL REVIEW A | 2003年 / 67卷 / 04期

关键词：

D O I：

10.1103/PhysRevA.67.042310

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present an explicit construction of entanglement witnesses for depolarized states in an arbitrary finite dimension. For an infinite dimension, we generalize the construction to twin beams perturbed by Gaussian noises in the phase and in the amplitude of the field. We show that entanglement detection for all these families of states require only three local measurements. The explicit form of the corresponding set of local observables needed for an entanglement witness is derived.

引用

页数：5

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