Device-Independent Bounds on Detection Efficiency

Jochen Szangolies, Hermann Kampermann, and Dagmar Bruß
Phys. Rev. Lett. 118, 260401 – Published 27 June 2017

Abstract

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 to systematically derive Bell inequalities free from the detection loophole using only the observed measurements statistics. The violation of these inequalities certifies that the detectors used exceed a certain minimal efficiency.

  • Figure
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  • Received 23 September 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.260401

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyGeneral Physics

Authors & Affiliations

Jochen Szangolies*, Hermann Kampermann, and Dagmar Bruß

  • Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany

  • *jochen.szangolies@hhu.de

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Vol. 118, Iss. 26 — 30 June 2017

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