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Recently, Frauchiger and Renner proposed a Gedankenexperiment, which wasclaimed to be able to prove that quantum theory cannot consistently describethe use of itself. Here we show that the conclusions of Frauchiger and Renneractually came from their incorrect description of some quantum states. With thecorrect description there will be no inconsistent results, no matter whichquantum interpretation theory is used. Especially, the Copenhageninterpretation can satisfy all the three assumptions (C), (Q), and (S) ofFrauchiger and Renner simultaneously, thus it has no problem consistentlydescribing the use of itself.

Copenhagen interpretation can survive the upgraded Schroedinger's cat Gedankenexperiment