Workshop on Wigner’s Friend 2018

Unitary quantum theories are incompatible with special relativity

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    In this paper, I argue that the combination of a unitary quantum theory and special relativity may lead to a contradiction when considering the probability distribution of certain measurement results in different Lorentz frames in a Gedankenexperiment. This result seems to imply that either unitary quantum theories are wrong or if a unitary quantum theory is right then there must exist a preferred Lorentz frame.

    I wish to thank Dennis Dieks, Aurelien Drezet, Jerry Finkelstein, Nicolas Gisin, Richard Healey, Dustin Lazarovici, Gijs Leegwater, Tim Maudlin, Travis Norsen, Elias Okon, Matt Pusey, Cristi Stoica, and Lev Vaidman for helpful discussion.

    More comments are welcome!

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