John Cramer is a physicist at the University of Washington, and he has a plan for signalling backwards in time via quantum entanglement…
What’s Done is Done… or is It? (at New Scientist)
…which is well explained by the article, for a layperson, but from a physicist’s point of view here’s John’s own papers available online…
An Experimental Test of Signaling using Quantum Nonlocality
…of course there’s a few assumptions involved. Firstly, the quantum entanglement is caused by a forwards-backwards-in-time handshake between the interacting particles – John’s own Transactional Interpretation of Quantum Mechanics. If instead the Quantum Multiverse is correct then the experiment might have a totally different outcome. Maybe. John’s Interpretation is mathematically equivalent to the Multiverse because both reproduce the mathematical formalism of quantum mechanics… but the Multiverse doesn’t feature retrocausality.
Could John’s retrocausality experiments be proof or disproof of the Multiverse?
