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.
- Received 21 June 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.130406
© 2013 American Physical Society
Synopsis
Closing Quantum Loopholes
Published 26 September 2013
New experiments strengthen confidence in the quantum weirdness of photons
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