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Device-independent certification of entangled measurements

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arxiv 1105.3138 v1 pith:ZHJ3ZEW5 submitted 2011-05-16 quant-ph

Rafael Rabelo , Melvyn Ho , Daniel Cavalcanti , Nicolas Brunner , Valerio Scarani This is my paper
classification quant-ph
keywords entangledmeasurementbelldevicedevice-independentpartiestestblack-box
verification ladder T0 review T1 audit T2 compute T3 formal
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We present a device-independent protocol to test if a given black-box measurement device is entangled, that is, has entangled eigenstates. Our scheme involves three parties and is inspired by entanglement swapping; the test uses the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality, checked between each pair of parties. Also, focusing on the case where all particles are qubits, we characterize quantitatively the deviation of the measurement device from a perfect Bell state measurement.

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