On Tuesday, August 6, 2019 at 5:29:04 PM UTC-5, Brent wrote: > > > > 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_histories > > is 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? > > Brent >
There is classical parallel hardware, e.g. made with multiple processors. Parallelism in quantum computers is achieved by parallel "worlds" or "paths": Quantum Path Computing - https://arxiv.org/abs/1709.00735 Quantum circuit dynamics via path integrals: Is there a classical action for discrete-time paths? - https://iopscience.iop.org/article/10.1088/1367-2630/aa61ba A “problem of time” in the multiplicative scheme for the n-site hopper Fay Dowker, Vojtˇech Havlicek, Cyprian Lewandowski, and Henry Wilkes - https://pdfs.semanticscholar.org/39d9/11e25b835ce8d34910c0a9e02f22ef8d4c41.pdf "Quantum Measure Theory (QMT*) is an approach to quantum mechanics, based on the path integral, in which quantum theory is conceived of as a generalized stochastic process." * https://pdfs.semanticscholar.org/bfda/1caa5afbbd9e2d6dcff5456325b60b64b909.pdf The sum-over-histories formulation of quantum computing - https://arxiv.org/abs/quant-ph/0607151 @philipthrift -- 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/0495742b-a4bc-4d81-8fde-58ee193fcdd5%40googlegroups.com.
