Recently, Frauchiger and Renner proposed a Gedankenexperiment, which was claimed to be able to prove that quantum theory cannot consistently describe the use of itself. Here we show that the conclusions of Frauchiger and Renner actually came from their incorrect description of some quantum states. With the correct description there will be no inconsistent results, no matter which quantum interpretation theory is used. Especially, the Copenhagen interpretation can satisfy all the three assumptions (C), (Q), and (S) of Frauchiger and Renner simultaneously, thus it has no problem consistently describing the use of itself.
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We thank the anonymous reviewer for sharing the ideas that leads to Sect. 4. The work was supported in part by Guangdong Basic and Applied Basic Research Foundation under Grant No. 2019A1515011048.
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He, G.P. Copenhagen Interpretation Can Survive the Upgraded Schrödinger’s cat Gedankenexperiment. Found Phys 50, 715–726 (2020). https://doi.org/10.1007/s10701-020-00343-7
- Quantum interpretation theory
- Copenhagen interpretation
- Schrödinger’s cat
- Quantum measurement
- Quantum entanglement