Retrocausality and quantum mechanics
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The results of experiments in quantum mechanics can be predicted correctly either by assigning a forward-evolving state to the system based on the preparationoutcome or by assigning a state that evolves backwards in time based on the measurement outcome. The latter picture admits some retrocausality without allowingmessages to be sent at a faster speed than that of light. This retrocausality allows some standard quantum paradoxes to be examined from a different viewpoint. It also allows closed causal cycles to be examined in the context of laboratory experiments. For a particular experiment, we find agreement with the principle that inconsistent causal loopshave zero probability of occurring, that is, only self-consistent loops can occur.
Studies in History and Philosophy of Modern Physics
Copyright 2008 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.