[ExI] Google’s Willow Quantum Chip: Proof of the Multiverse?

[John Clark]

On Mon, Oct 13, 2025 at 11:33 PM Adrian Tymes via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

 >*Under MWI, the worlds are separate after splitting, with no way to
> interact.  And yet, this MWI explanation for this requires them to
> interact.  By what means does the information get from one world to another
> after splitting?*
>

*According to the Many World's idea, a Mach-Zehnder interferometer (or a
quantum bomb tester) works the way it does because a world splits when the
laws of physics allow it to change in two different ways, for example
passing through a half silvered mirror AND being reflected by a half
silvered mirror. Normally after a small change the difference only becomes
larger, however if an experimenter is clever and very careful he can make a
very tiny change that only exists for a very short time and then arrange
things so that the two worlds become identical again, and thus merge back
together. So in that merged world there are indications the photon went
through the half silver mirror AND indications the photon was reflected by
the half silver mirror. However no which-path information remains in the
final merged world.*

*Some might object to what I say and insist that the branches were never
fully separate worlds if they can still interfere, they were just different
components of the same wavefunction. But if Many Worlds is correct then
EVERYTHING is part of the same "Universal Wave Function", which is just
another name for the multiverse.*

*John K Clark*
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