On 2/25/2025 6:56 PM, Liz R wrote:
On Thursday, 6 February 2025 at 07:42:57 UTC+13 Alan Grayson wrote:
And why the MWI is unverifiable and tantamount to a fantasy. AG
I don't know if David Deutsch still considers this a valid response,
but it's come a darn sight closer to reality since he suggested it
back in the 90s (I think). He claimed that explaining a sufficiently
advanced quantum computer requires the MWI. The other day I saw a
headline about the latest quantum computer that could - in principle,
of course - outperform a classical computer by a factor of many
trillions. Unfortunately I can't remember where I saw it, but there
was some huge age-of-the-universe-plus claim involved.
So, if we assume that a quantum computer can reach the point where it
outperforms a classical computer by more than the theoretical limit -
something involving the Bekenstein Bound and Margolus-Levitin Limit,
apparently, which ChatGPT reliably informs me for a volume V and time
t comes down to
Max computations∼(c^5/ ℏG). tV
Unless I'm mistaken that has dimensions of acceleration, L/T^2 ??
(c, G and h bar having their usual values).
So if this is possible, the MWI would become verifiable, in that - to
quote Professor Deutsch - where else can the computations be
performed, except in branches of a multiverse?
Scott Aaronson's response was how can the computation be performed
except by the qubits interacting; which requires they be in the same world.
Brent
Anyway, I don't suppose this will actually be demonstrated anytime
soon, but it is one theoretical test of the MWI, hence it's - very
much in principle - verifiable.
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