On 13/06/2017 1:09 am, John Clark wrote:
On Fri, Jun 9, 2017 at 7:11 PM, Bruce Kellett
<bhkell...@optusnet.com.au <mailto:bhkell...@optusnet.com.au>>wrote:
>
Scott Aaronson points out:
"/The way a quantum algorithms work is that they arrange for wrong
answers to destructively interfere while the desired answer
interferes constructively. Interference requires that they take
place in the same world/."
I agree Interference must take place in a single world, but where did
all the information that produced the interference come from, where
did the computations that produced all those wrong answers (and a few
correct ones) come from?
What calculations are performed in these parallel worlds? And what
performs those calculations? You are the one who insists that
calculation is possible only on a physical computer. Who constructed all
these physical computers in the parallel worlds?
Even the 2-slit experiment will not produce interference if you remove
the photographic plate and just allow the photons to continue into
infinite space after they pass the slits because then the world splits
but the two never recombine again so no interference.
Of course the interference continues -- for ever if necessary. The
screen or photographic plate is only there to enable you to see it. Try
moving the position of the screen, what happens?
You need places for things to become different and also a place for
things to come together again for interference to occur.
Superpositions occur everywhere, and no new worlds are split off until
there is decoherence.
Bruce
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