On Wed, Aug 7, 2019 at 4:00 AM 'Brent Meeker' via Everything List < [email protected]> 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. > Exactly. So there are no other components in superposition. Bruno wants to characterize this as a collapse. But without this happening, the QC would be unreliable -- there would be some finite probability that you would get the wrong result. As I understand it, there are some QC algorithms that do not lead to definite results, so you have to run them several times to reduce the probability of a wrong answer to some acceptable level. As usual, Bruno is introducing irrelevancies in order to distract attention from the fact that he cannot answer the central contention of my argument -- which is that quantum computer do not provide any evidence for the existence of parallel worlds. They can work perfectly well in just one world -- without any collapse whatsoever. Bruce Yet this is the kind of algorithm that Deutsch cites as proving there > must be many worlds. Brent > -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLTNyfc01ESYvTCEnqJo8ZU0Paa6Ce9MExoQ-UoMs3YUKQ%40mail.gmail.com.
