Experimental Semi-Device-Independent Certification of Entangled Measurements

Bennett, A. and Vértesi, Tamás and Saunders, D. J. and Brunner, N. and Pryde, G. J. (2014) Experimental Semi-Device-Independent Certification of Entangled Measurements. PHYSICAL REVIEW LETTERS, 113 (8). ISSN 0031-9007

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Abstract

Certifying the entanglement of quantum states with Bell inequalities allows one to guarantee the security of quantum information protocols independently of imperfections in the measuring devices. Here we present a similar procedure for witnessing entangled measurements, which play a central role in many quantum information tasks. Our procedure is termed semi-device-independent, as it uses uncharacterized quantum preparations of fixed Hilbert space dimension. Using a photonic setup, we experimentally certify an entangled measurement using measurement statistics only. We also apply our techniques to certify unentangled but nevertheless inherently quantum measurements.

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