On 28 October 2014 08:58, meekerdb <[email protected]> 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. > 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 exactly is "superposition in the same world" in the Everett view? As far as I can make out from David Deutsch's explanations qcs involve a temporary splitting into two or more worlds, (or the equivalent - differentiation or whatever). So a quantum calculation involves a mini multiverse being created and collapsed again under controlled conditions. Have I misunderstood that? TBH I can't actually see what else a superposition *could* be, in the Everett picture (although I assume if you're looking at things from a path integral view or pilot wave (etc) then you have something that really is more or less duplicated in one universe, like Schrodinger's cat in the popular conception being "both alive and dead"...) -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
