Observers in distinct Everettian multiverse branches can communicate via a Wigner's friend scenario without violating quantum linearity, provided they forget the message sent.
Schlosshauer,Decoherence, the measurement problem, and interpretations of quantum mechanics, Reviews of Modern Physics76, 1267–1305 (2005)
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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.