Estimating Entanglement Measures in Experiments

O. Gühne, M. Reimpell, and R. F. Werner
Phys. Rev. Lett. 98, 110502 – Published 16 March 2007

Abstract

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 et al., Phys. Rev. Lett. 92, 087902 (2004)], giving bounds on the entanglement of formation and the geometric measure of entanglement in this experiment.

  • Figure
  • Received 2 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.110502

©2007 American Physical Society

Authors & Affiliations

O. Gühne1, M. Reimpell2, and R. F. Werner2

  • 1Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, A-6020 Innsbruck, Austria
  • 2Institut für Mathematische Physik, Technische Universität Braunschweig, Mendelssohnstraße 3, D-38106 Braunschweig, Germany

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Issue

Vol. 98, Iss. 11 — 16 March 2007

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