Estimating entanglement of unknown states

Details Estimating entanglement of unknown states Estimating entanglement of unknown states

2006-05-17

arxiv.org/abs/quant-ph/0605155v2

Appl. Phys. Lett. 89, 084102 (2006)

Physics

Quantum Physics

3 pages, 1 figure. Comments welcome. V2: references updated. Accepted version by Applied Physics Letters

Scientific paper

10.1063/1.2337535

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.

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