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THEORY-1222: In relational quantum mechanics as stated in Rovelli (1996), rules (i) and (ii), that there is no state except within a further observer's information and no information without interaction, exclude any contradiction between observers' views: what a third system predicts of two observers' information always agrees with what it finds on interacting with them

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Properties4
StatusProposed
Tagsquantum-foundations, metaphysics
SourceLIT-1635 — Relational Quantum Mechanics
ExtendsTHEORY-1080 — In relational quantum mechanics as Rovelli first stated it, the relation between two observers' descriptions is itself a quantum fact relative to a third system, so no observer's view can be deduced from another's and there is no description in toto, only a net of partial descriptions; the views are held consistent only in that the third system predicts correlated outcomes, which is shown for a single measurement and asserted in general

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Source

Rovelli (1996), LIT-1635, arXiv quant-ph/9609002v2, §§II.D and III.D; read in NOTE-1227. What the paper states and shows is THEORY-1080, which this entry extends.

Why it is Proposed

Consistency is shown for the single S–O–P case, by von Neumann’s correlation (p. 9). That rules (i) and (ii) leave “no way in which contradiction may develop” is asserted for the general case, not proved.

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