Cosmic Bell Test Using Random Measurement Settings from High-Redshift Quasars
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PhysRevLett.121.080403.pdf
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1016.06 KB
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Author(s)
Rauch, Dominik
Handsteiner, Johannes
Hochrainer, Armin
Gallicchio, Jason
Friedman, Andrew S.
Liu, Bo
Bulla, Lukas
Ecker, Sebastian
Steinlechner, Fabian
Ursin, Rupert
Date Issued
August 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Rauch, Dominik et al. "Cosmic Bell Test Using Random Measurement Settings from High-Redshift Quasars." Physical Review Letters 121, 8 (August 2018): 080403
Version
Final published version
Abstract
In this Letter, we present a cosmic Bell experiment with polarization-entangled photons, in which measurement settings were determined based on real-time measurements of the wavelength of photons from high-redshift quasars, whose light was emitted billions of years ago; the experiment simultaneously ensures locality. Assuming fair sampling for all detected photons and that the wavelength of the quasar photons had not been selectively altered or previewed between emission and detection, we observe statistically significant violation of Bell’s inequality by 9.3 standard deviations, corresponding to an estimated p value of ≲7.4×10^{-21}. This experiment pushes back to at least ∼7.8 Gyr ago the most recent time by which any local-realist influences could have exploited the “freedom-of-choice” loophole to engineer the observed Bell violation, excluding any such mechanism from 96% of the space-time volume of the past light cone of our experiment, extending from the big bang to today.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.121.080403
