Journal
FOUNDATIONS OF PHYSICS
Volume 48, Issue 11, Pages 1568-1589Publisher
SPRINGER
DOI: 10.1007/s10701-018-0216-6
Keywords
Quantum theory; Objectivity; Wigner's friend; Brukner; Frauchiger and Renner
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Three recent arguments seek to show that the universal applicability of unitary quantum theory is inconsistent with the assumption that a well-conducted measurement always has a definite physical outcome. In this paper I restate and analyze these arguments. The import of the first two is diminished by their dependence on assumptions about the outcomes of counterfactual measurements. But the third argument establishes its intended conclusion. Even if every well-conducted quantum measurement we ever make will have a definite physical outcome, this argument should make us reconsider the objectivity of that outcome.
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