Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 8: Quantum Information: Concepts and Methods II

Q 8.8: Vortrag

Montag, 29. Februar 2016, 16:15–16:30, e214

Device-Independent Bounding of Detector Efficiencies — •Jochen Szangolies, Hermann Kampermann, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine Universität Düsseldorf

In many quantum information applications, a minimum detection efficiency must be exceeded to ensure success. Protocols depending on the violation of a Bell inequality, for instance, may be subject to the so-called detection loophole: imperfect detectors may yield spurious violations, which consequently cannot be used to ensure, say, quantum cryptographic security. Hence, we investigate the possibility of giving lower bounds on detector efficiency even if an adversary has full control over both the source and the detectors. To this end, we present a technique, based on characterizing the polytope of local correlations, to systematically derive Bell inequalities free from the detection loophole whose violation certifies that the detectors used exceed a certain minimal efficiency.