Detection-Loophole-Free Test of Quantum Nonlocality, and Applications

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Authors

Bradley Christensen · University of Illinois Urbana-Champaign

Kevin T. McCusker · University of Illinois Urbana-Champaign

Joseph B. Altepeter · University of Illinois Urbana-Champaign

Brice Calkins · National Institute of Standards and Technology

Thomas Gerrits · National Institute of Standards and Technology

Adriana E. Lita · National Institute of Standards and Technology

Abstract

We present a source of entangled photons that violates a Bell inequality free of the "fair-sampling" assumption, by over 7 standard deviations. This violation is the first reported experiment with photons to close the detection loophole, and we demonstrate enough "efficiency" overhead to eventually perform a fully loophole-free test of local realism. The entanglement quality is verified by maximally violating additional Bell tests, testing the upper limit of quantum correlations. Finally, we use the source to generate "device-independent" private quantum random numbers at rates over 4 orders of magnitude beyond previous experiments.

Topics & Keywords

Quantum Mechanics and Applications Quantum Information and Cryptography Quantum Computing Algorithms and Architecture

UN Sustainable Development Goals

Reduced inequalities

Publication Details

Published in: Physical Review Letters

Volume 111, Issue 13, pp. 130406-130406

DOI: 10.1103/physrevlett.111.130406

Field-Weighted Citation Impact: 37.70