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Experimental detection of entanglement with optimal-witness families

We report an experiment in which one determines, with least tomographic effort, whether an unknown two-photon polarization state is entangled or separable. The method measures whole families of optimal entanglement witnesses. We introduce adaptive measurement schemes that greatly speed up the entanglement detection. The experiments are performed on states of different ranks, and we find good agreement with results from computer simulations.

preprint2014arXivOpen access
Jibo DaiYink Loong LenYong Siah TeoBerthold-Georg EnglertLeonid A. Krivitsky
quant-ph
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Jibo DaiYink Loong LenYong Siah TeoBerthold-Georg EnglertLeonid A. Krivitsky

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