Physics – Quantum Physics
Scientific paper
2006-07-24
Phys. Rev. Lett. 98, 110502 (2007)
Physics
Quantum Physics
4 pages, 1 figure, v2: final version
Scientific paper
10.1103/PhysRevLett.98.110502
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 multi-photon 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.
Gühne Otfried
Reimpell M.
Werner Reinhard F.
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