I was citing Carroll on the delayed choice quantum erasure...not on
anything Deutsch said.
The problem I see in this is that the computer must make a measurement
that does two things
(1) it prints out a document that is causally dependent on a distinct
measured value existing (not just: there was an electron so it prints "I
measured it.")
(2) the measurement must be quantum erased.
I think this is impossible because (1) depends on the measurement, being
either LEFT or RIGHT and that specific distinct value being amplified to
a classical variable "A measurement was made" which is embodied into the
text of the document. It can't be the exclusive OR of the L or R
variables that is amplified, because that would always be true and would
just be the equivalent of printing "I measured it." every time. But if
the distinct variable is amplified to a classical value, a print
command, it can't be quantum erased.
For comparison look at the Buckyball twin slit experiment. The
interference pattern disappears as the Buckyball radiation becomes
sufficient in principle to locate it, even though the radiation just
gets absorbed in the lab wall somewhere and statistically cannot be use
to know where the Buckyball went.
Brent
On 10/27/2022 5:10 AM, John Clark wrote:
On Thu, Oct 27, 2022 at 12:23 AM Brent Meeker <[email protected]>
wrote:
>> Why would you believe the universe is ALWAYS lying to us?
Why do you believe the existence of dinosaur bones implies
that dinosaurs once existed?
/> It isn't "The Universe" that is producing this document. It's
some AI that Deutsch postulates is conscious, can measure a
quantum variable, erase the measurement, but remember that it knew
the value and writes a message saying so. Yeah, I'm sure that'll work/
Forget consciousness. You program a computer to make a measurement
about which slit an electron goes through, if the machine is able to
make the measurement you program it to produce a document saying it
has knowledge of which slit the electron went through but does not
state which slit that is, and you program the computer to then use
quantum erasure to get rid of that which-way information but to leave
the document intact. Every time you and many other people perform this
experiment using their own equipment and their own independently
written program interference bands are always seen and a document
insisting that a which-way measurement has been successfully completed
is also always seen. At this point a rational person would have to
conclude that either Many Worlds is correct or the universe is a liar.
And if the universe is a liar then it's time to give up on science.
John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>
0mo
0mo
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