Estimating entanglement measures in experiments

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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.
4 pages, 1 figure, v2: final version

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/126318

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/quant-ph/0607163
 http://arxiv.org/abs/quant-ph/0607163
 Phys. Rev. Lett. 98, 110502 (2007)
 doi:10.1103/PhysRevLett.98.110502

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arXiv