Violation of local realism with freedom of choice

Publication Type:
Journal Article
Proceedings of the National Academy of Sciences of the United States of America, 2010, 107 (46), pp. 19708 - 19713
Issue Date:
Full metadata record
Bell's theorem shows that local realistic theories place strong restrictions on observable correlations between different systems, giving rise to Bell's inequality which can be violated in experiments using entangled quantum states. Bell's theorem is based on the assumptions of realism, locality, and the freedom to choose betweenmeasurement settings. In experimental tests, "loopholes" arise which allow observed violations to still be explained by local realistic theories. Violating Bell's inequality while simultaneously closing all such loopholes is one of the most significant still open challenges in fundamental physics today. In this paper, we present an experiment that violates Bell's inequality while simultaneously closing the locality loophole and addressing the freedom-of-choice loophole, also closing the latter within a reasonable set of assumptions.We also explain that the locality and freedom-of-choice loopholes can be closed onlywithin nondeterminism, i.e., in the context of stochastic local realism.
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