On 8/6/2019 11:25 AM, Philip Thrift wrote:
On Tuesday, August 6, 2019 at 1:00:23 PM UTC-5, Brent wrote: On 8/6/2019 6:38 AM, Bruno Marchal wrote:If the QC does its task effectively, the output basis qbits will be put into definite states,Relatively to the observer, but in the global state, the observer will inherit the superposition state, by linearity of the tensor products and of the evolution.In something like Shor's algorithm there is only one final state with non-vanishing probability. Yet this is the kind of algorithm that Deutsch cites as proving there must be many worlds. Brent That there is a multiplicity of /somethings/ https://en.wikipedia.org/wiki/Multiple_historiesis the basis for all semantics of quantum computing (by computer scientists) that I have ever seen.
Same for classical computation...there are lots of states or functions. Did anyone think there had to be multiple worlds for the computer to work?
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