This implies either:
- The past is real and changeable (at a quantum level)
Or
- The particle knows the future; so the future is probably real (else just fully deterministic) — Devans99
So in this experiment, a decision to raise a screen effects whether a particle goes through a double slit as a particle or a wave IN THE PAST. — Devans99
Most physicists think the answer is a resounding "no." No, we cannot kick back with retrocausality. Or, at the very least, the experiment, whether conducted across a lab or across galaxies, doesn't support the idea of time travel. — gizmodo.com
Proof of retrocausality would prove that time (an ontological distinction between past, present, and future) is not real, not the other way around. The experiment is no proof of retrocausality, just a demonstration of the nonlocality of some quantum interpretations.Surely we can conclude time is real with 90% certainty? — Devans99
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