I've subscribed to Poe, https://poe.com/, and I had a nice conversation
about Jacob Barandes formulation of QM, the Minimal Modal
Interpretation, as compared to MWI. Don't know how it would do at
crosswords.
Be well.
Brent
On 3/1/2025 12:54 AM, Liz R wrote:
Thanks for the recommendation Brent, I have now read Scott's blog and
while remaining as agnostic as ever, it's given me even more to occupy
myself with at 4am if I can't sleep and start wondering whether
there's a copy of me that can (either in a quantum branch or far, far
across the universe).
By the way, the quantum computer article I mentioned was
https://jasondeegan.com/even-10000-trillion-years-might-not-suffice-for-a-supercomputer-to-outperform-googles-new-quantum-machine/
<https://jasondeegan.com/even-10000-trillion-years-might-not-suffice-for-a-supercomputer-to-outperform-googles-new-quantum-machine/>
As for Chatty's estimate of the fundamental computational limit, it's
probably wrong but I just used it for the sake illustration. I'm sure
there must be some sort of limit in a quantised universe, so I guess
David Deutsch's argument still remains "in principle" testable, just
like flying around the solar system does. As it happens, I sometimes
ask Chatty complicated questions about cryptic crossword clues, and it
invariably tries to answer while missing the point of what I mean -
which means my job as a crossword compiler remains safe from AI for
now, at least.
Best wishes,
Liz
On Wednesday, 26 February 2025 at 18:41:34 UTC+13 Brent Meeker wrote:
Have you read Scott Aaronson's blog on MWI.
https://scottaaronson.blog/?p=1103
I especially recommend his answer to Greg Egan's comment.
Brent
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
(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?
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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