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The experimental determination of entanglement is a major goal in the quantuminformation field. In general the knowledge of the state is required in orderto quantify its entanglement. Here we express a lower bound to the robustnessof entanglement of a state based only on the measurement of the energyobservable and on the calculation of a separability energy. This allows theestimation of entanglement dismissing the knowledge of the state in question.Comment: 3 pages, 1 figure. Comments welcome. V2: references updated. Accepted  version by Applied Physics Letter

Estimating entanglement of unknown states