Decoherence allows quantum theory to describe the use of itself
Abstract
We show that the quantum description of measurement based on decoherence fixes the bug in quantum theory discussed in [D. Frauchiger and R. Renner, Quantum theory cannot consistently describe the use of itself, Nat. Comm. 9, 3711 (2018)]. Assuming that the outcome of a measurement is determined by environment-induced superselection rules, we prove that different agents acting on a particular system always reach the same conclusions about its actual state.
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