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The extended Wigner's friend problem deals with two Observers each measuringa sealed laboratory in which a friend is making a quantum measurement. Weinvestigate this problem by relying on the basic rules of quantum mechanics asexposed by Feynman in the well-known "Feynman Lectures on Physics". Althoughrecent discussions have suggested that the extended Wigner's friend problemcannot consistently be described by quantum theory, we show here that astraightforward application of these standard rules results in a non-ambiguousand consistent account of the measurement outcomes for all agents involved.

Extended Wigner's friend problem and the internal consistency of standard quantum mechanics