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Local Detection of Entanglement
We construct an explicit model where it can be established if a two mode pure
Gaussian system is entangled or not by acting only on one of the parts that
constitute the system. Measuring the dispersion in momentum and the time
evolution of the dispersion in position of one particle we can tell if
entanglement is present as well as the degree of entanglement of the system.Comment: 6 pages, 4 figures, title changed, published version: to appear in
European Physical Journal
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