On 1/27/2021 5:11 PM, Pierz Newton-John wrote:
I’m not saying decoherence is reversible. I’ve corrected myself (or accepted your correction) on that point. But my understanding of proposals for disconfirming MWI involve extending quantum coherence to larger and larger scales. Deutsch has argued that if we can get enough qubits into a quantum computation, we’ve effectively “proved” MWI since “where did all that information come from?".
And Scott Aaronson has pointed out it all had to be in this world in order for interference to produce an answer.
Brent
Other proposals similarly involve reversibility at large scales. If QM is not universal, then at some scale that will prove impossible not merely due to technological limits, but limits of the laws of physics. If such a limit were found, that would certainly disconfirm MWI.
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