No, different observers do not see “irreconcilable facts”: on “Wigner’s Friend”

A recent experiment in the lab, billed as a “Wigner’s Friend” experiment, has been interpreted as a test of “local observer independence.” The authors claim the experiment shows that observers must irreconcilably disagree on facts related to quantum measurements. The paper posted below shows that this is a misinterpretation of the experiment, and that the facts are completely consistent. It is only the attribution of outcomes where no outcomes obtain that causes the inconsistency.

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