On 27 Oct 2014, at 20:58, meekerdb wrote:
On 10/27/2014 3:38 AM, LizR wrote:
It would be nice if Mr Clark would EITHER stop joining in with
discussions just to say that he doesn't care about comp, OR state
what he agrees or disagrees with in Bruno's stated argument.
Just saying it's "obviously wrong" doesn't really cut it. So far
the only real (non-sarcastic, non-insult-based) objection I've
heard comes down to a semantic quibble to do with redefining our
concept of an individual person. This is exactly the same
redefinition that was brought up by Everett in 1957. It isn't in
itself contentious - a physicist who believes the MWI to be correct
will come to the same conclusions about indeterminacy that someone
using Bruno's matter transmitter would - that it's a phenomenon
experienced from a first person perspective because of the person
in question being split into two copies. The phenomena actually map
onto each other, because both comp and Everett allow for the
possibility that from the third person viewpoint the duplication
could be observed - quantum computers rely on precisely that fact.
Quantum computers (of the circuit type) rely on interference to pick
out the right solution. Interference implies superposition in the
same world.
Only if you isolate the subsystem well enough. Imagine that I can
isolate my room, where I am, sufficiently, and in that room I succeed
in isolating schroedinger cat (prepared in the alive + dead state) in
a box. Then, in my isolated room I look at the cat (measuring in the
alive/dead base) .QM description is that when I do that measurement, I
put myself in the superposition alive + dead. It follows from the
linearity of evolution and of the tensor product. You might say that I
am in that superposed state in *one* world. But if my room is not
sufficiently well isolated, or more normally when I go out of that
room, announcing with some joy that the cat is alive, well soon
enough, the environment (the building with that room, then city, and
you coming for a visit) get in the superposition "history of the earth
with that Shroedinger car alive + history of the earth with that
Shroedinger car dead.
Would you still say that it is a superposition in *one* world. Yes,
the differentiation of the galaxies will follows, at the speed of
light, and I guess there will be two Milky ways colliding with
Andromeda, one with archive describing the fact that that Schroedinger
cat was alive, and one with the fact that that Schroedinger cat is
dead. Would you still say that there is one world? I like to define a
physical world (in the quantum theory) by a set of objects/events
close for interaction. That makes the many world the literal
interpretation of QM. Without collapse, I don't see how the term of
the superposition can ever disappear.
I highly recommend Scott Aaronson's blog http://www.scottaaronson.com/blog/
, for straight talk about quantum computing (his book "Quantum
Computing Since Democritus" is also very good).
What is his position on Everett?
Bruno
Brent
Hence, the fact that comp says that such splitting can occur
doesn't disprove comp unless it also disproves Everett.
And of course, making up silly versions of Bruno's acronyms also
doesn't show that comp is wrong. It certainly didn't work for Fred
Hoyle's attempts to ridicule the Big Bang.
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