Observers in distinct Everettian multiverse branches can communicate via a Wigner's friend scenario without violating quantum linearity, provided they forget the message sent.
Everett,Relative state formulation of quantum me- chanics, Reviews of Modern Physics29, 454–462 (1957)
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Quantum observers can communicate across multiverse branches
Observers in distinct Everettian multiverse branches can communicate via a Wigner's friend scenario without violating quantum linearity, provided they forget the message sent.