On 2/26/2015 4:36 PM, LizR wrote:
On 27 February 2015 at 13:04, meekerdb <meeke...@verizon.net
<mailto:meeke...@verizon.net>> wrote:
On 2/26/2015 3:24 PM, LizR wrote:
Can you explain the problem a bit more for us dummies? ISTM - probably
this just
shows I don't understand the problem, but I may as well state my, ahem,
position
- that all measurements made using a physical apparatus are going to
resolve
into the position of something, e.g. the position of a pointer or
pixels on a
display. Is that anything to do with the "position basis" and if so why
is that
a problem?
I don't think they always involve the position basis. But once we get the
measurement in whatever basis we can classical transfer it into a position
basis
which is an easy way to share it. For example, we can 'see' the momentum
of photons
provided they are in a certain range. But we use instruments (e.g. grating)
to
spread them out so the momentum is measured by the location of a spot on
film
instead of seeing the photon directly and judging its color.
OK, so maybe positioning things makes them easier to measure, I guess. But I don't see
why this is a problem for interpretations of QM.
It makes the basis of the splitting into multiple worlds indefinite just as location of
the Heisenberg is indefinite. But Everett's interpretation seems to force the cut to be
"at the observer" as Russell noted. That requires writing down operators that project
onto eigenstates of consciousness - which is sort of what quantum bayesianism tries to
do. But that's pretty far from the laboratory practice which is to put the cut at the
recording instrument - the one can reference and show to colleagues.
As I understand Bruno's theory of reversal of psychology and physics, one starts with
computation that generates thoughts/ideas/perceptions and then the physical world is
inferred from them. Hopefully it will be possible to show that they sort themselves out
into coherent "worlds" with some kind of measure that implies the Born rule. This is a
kind of extension of Bertrand Russell's neutral monism in which there were just events and
the events could be sorted into threads that were connected by ideas, and this constituted
a consciousness, or sorted another way into causal chains and this constituted the
physical world.
Brent
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