Observers in distinct Everettian multiverse branches can communicate via a Wigner's friend scenario without violating quantum linearity, provided they forget the message sent.
Instead it would render its ex- istence trivial, considering all three agents involved can deduce the contents of the message with no inter-branch communication required
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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.