Retrocausal classical capacity equals the sum of max-information and regularized Doeblin information; quantum capacity equals their average.
Deutsch,Quantum mechanics near closed timelike lines, Physical Review D44, 3197 (1991)
2 Pith papers cite this work. Polarity classification is still indexing.
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quant-ph 2verdicts
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Observers in distinct Everettian multiverse branches can communicate via a Wigner's friend scenario without violating quantum linearity, provided they forget the message sent.
citing papers explorer
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Retrocausal capacity of a quantum channel
Retrocausal classical capacity equals the sum of max-information and regularized Doeblin information; quantum capacity equals their average.
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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.