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A Cosmic Bell Test with Measurement Settings from Astronomical Sources

zqyin 添加于 2016-11-22 10:09 | 1033 次阅读 | 0 个评论
  •  作 者

    Handsteiner J, Friedman AS, Rauch D, Gallicchio J, Liu B, Hosp H, Kofler J, Bricher D, Fink M, Leung C, Mark A, Nguyen HT, Sanders I, Steinlechner F, Ursin R, Wengerowsky S, Guth AH, Kaiser DI, Scheidl T, Zeilinger A
  •  摘 要

    Bell\'s theorem states that some predictions of quantum mechanics cannot be reproduced by a local-realist theory. That conflict is expressed by Bell\'s inequality, which is usually derived under the assumption that there are no statistical correlations between the choices of measurement settings and anything else that can causally affect the measurement outcomes. In previous experiments, this \"freedom of choice\" was addressed by ensuring that selection of measurement settings via conventional \"quantum random number generators\" (QRNGs) was space-like separated from the entangled particle creation. This, however, left open the possibility that an unknown cause affected both the setting choices and measurement outcomes as recently as mere microseconds before each experimental trial. Here we report on a new experimental test of Bell\'s inequality that, for the first time, uses distant astronomical sources as \"cosmic setting generators.\" In our tests with polarization-entangled photons, measurement settings were chosen using real-time observations of Milky Way stars while simultaneously ensuring locality. We observe statistically significant $gtrsim 11.7 sigma$ and $gtrsim 13.8 sigma$ violations of Bell\'s inequality with estimated $p$-values of $ lesssim 7.4 times 10^{-32}$ and $lesssim 1.1 times 10^{-43}$, respectively, thereby pushing back by $sim$600 years the most recent time by which any local-realist influences could have engineered the observed Bell violation.
  •  详细资料

    • 关键词: quant-ph; astro-ph.CO
    • 文献种类: Manual Script
    • 期卷页: 2016
    • 日期: 2016-11-22
    • 发布方式: arXiv e-prints
    • 备注:http://arxiv.org/abs/1611.06985v1
  • 学科领域 自然科学 » 物理学

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