The authors derive a GHZ-FR paradox from strong contextuality that avoids post-selection and quantum reasoning by modeled observers, unlike the original FR paradox.
Decoherence allows quantum theory to describe the use of itself
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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, {\em Quantum theory cannot consistently describe the use of itself}, Nat. Comm. {\bf 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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quant-ph 1years
2024 1verdicts
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A refined Frauchiger--Renner paradox based on strong contextuality
The authors derive a GHZ-FR paradox from strong contextuality that avoids post-selection and quantum reasoning by modeled observers, unlike the original FR paradox.