Estimating entanglement measures in experiments

被引：152

作者：

Guehne, O. ^{[1
]}

Reimpell, M.

Werner, R. F.

机构：

[1] Austrian Acad Sci, Inst Quantenopt & Quanteninformat, A-6020 Innsbruck, Austria

[2] Tech Univ Braunschweig, Inst Math Phys, D-38106 Braunschweig, Germany

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.98.110502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a method to estimate entanglement measures in experiments. We show how a lower bound on a generic entanglement measure can be derived from the measured expectation values of any finite collection of entanglement witnesses. Hence witness measurements are given a quantitative meaning without the need of further experimental data. We apply our results to a recent multiphoton experiment [M. Bourennane , Phys. Rev. Lett. 92, 087902 (2004)], giving bounds on the entanglement of formation and the geometric measure of entanglement in this experiment.

引用

页数：4

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