Estimating entanglement of unknown states
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The experimental determination of entanglement is a major goal in the quantum information field. In general the knowledge of the state is required in order to quantify its entanglement. Here we express a lower bound to the robustness of entanglement of a state based only on the measurement of the energy observable and on the calculation of a separability energy. This allows the estimation of entanglement dismissing the knowledge of the state in question.
3 pages, 1 figure. Comments welcome. V2: references updated. Accepted version by Applied Physics Letters
3 pages, 1 figure. Comments welcome. V2: references updated. Accepted version by Applied Physics Letters