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Imperfections in experimental measurement schemes can lead to falselyidentifying, or over estimating, entanglement in a quantum system. A recentsolution to this is to define schemes that are robust to measurementimperfections - measurement device independent entanglement witness (MDI-EW).Here we introduce a novel approach for MDI-EW, which significantly reduces theexperimental complexity and is applicable to a wide range of physical systems.The scheme requires no prior description of the state, is detection loop-holefree, robust to classical communication, and works for all entangled qubitstates. We focus on photonic entanglement, experimentally generating andtesting bipartite Werner states, varying the entanglement from the maximallyentangled Bell state, past the bound for nonlocal states and down to theseparable bound of 1/3. We witness entanglement down to an entangled statefraction close to 0.4. These results could be of particular interest for deviceindependent quantum random number generation.

Resource-efficient measurement device independent entanglement witness