Observers in distinct Everettian multiverse branches can communicate via a Wigner's friend scenario without violating quantum linearity, provided they forget the message sent.
Polchinski,Weinberg’s Nonlinear Quantum Mechan- ics and the Einstein–Podolsky–Rosen Paradox, Physical Review Letters66, 397–400 (1991)
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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.