On Sun, Jul 29, 2018 at 10:30 PM, <[email protected]> wrote: > > > On Monday, July 30, 2018 at 3:11:47 AM UTC, Jason wrote: >> >> >> >> On Sun, Jul 29, 2018 at 6:44 PM, <[email protected]> wrote: >> >>> >>> >>> On Sunday, July 29, 2018 at 11:23:49 PM UTC, [email protected] wrote: >>>> >>>> >>>> >>>> On Sunday, July 29, 2018 at 10:31:05 PM UTC, Jason wrote: >>>>> >>>>> Quantum computers represent a disproof of the conjecture that the wave >>>>> function is merely a convenience or tool for estimating probabilities of >>>>> experimental outcomes, rather than something that is real. The reason: it >>>>> does things we cannot. >>>>> >>>>> Jason >>>>> >>>> >>>> Can you be specific? Why does quantum computing depend on both states >>>> of a qubit(?) be occupied simultaneously? Can the system toggle between >>>> those states, yet not be in both simultaneously? Couldn't quantum computing >>>> work, or say be conceptualized with his model? TIA, AG >>>> >>> >>> IOW, is the model of superposition you use in quantum computing a >>> necessary condition for its success, or could you use the information-only >>> model of the superposition and get the same result. AG >>> >>>> >>>>> >>>>> >> >> In order to explain the final result of the computation appearing in the >> measured qubits, each of the intermediate states must have existed and >> interacted, >> > > *What are the intermediate states? * >
Like a computer program before it prints its result and halts, the quantum computer takes advantage of the unmeasured isolated QM system which can enter a superposition of many simultaneous states, in the end, before the quantum computer prints its result, it must use interference effects to get all parts of the wave function to agree before it halts and gets measured. If it doesn't then whoever measures the result of the quantum computer will become entangled with that multi-valued state (causing that observer to split). > > *Isn't a qubit system a two-state system? AG* > A qubit will provide only 1 of 2 possible values when measured, but it can take on an arbitrarily large number of states within the superposition through successive interaction with other qubits, effectively growing exponentially. > > >> all the while remaining in a super position (completely isolated from the >> environment that contains the quantum computer) for the duration of the >> computation. The computation might have been a very long one, and may have >> involved vast numbers of states simultaneously held by the qubits during >> the computation. Each of these states is designed by the quantum >> computation to interfere in such a way to that in most of the branches the >> measured qubits will yield the same result. >> >> We know we can prepare a quantum computation. We know we can measure the >> qubits afterwards to get the final answer. >> The big question of "what is going on in the middle?" can only be >> answered by resorting to asking what the theory can tell us of what the >> wave function is doing to perform and implement the computation while we >> are not measuring it. >> > > *Since when does QM tell us what is happening to a wf when the system it > represents is not being measured? * > This is given by the Schrödinger equation. > > *Are you referring to decoherence theory? AG * > No. Decoherence is exactly what you want to avoid within a quantum computer. That is the main engineering difficulty, keeping coherence (keeping the system of the quantum computer isolated from the rest of the environment so that the superposition can be maintained and evolve and (from our point of view (being isolated from it)) enter many many states. > >> If one denies the existence of the wave function >> > > > *I don't. AG * > Okay. That's good. If one accepts that the wave function is real, and that it can implement computations, then the interesting question becomes: what happens when those computations are conscious? Jason > > however, it leaves no room for talking about these intermediate states >> that are necessary to explain how the final result of the computation ends >> up in the qubits. >> >> Jason >> > -- > 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 https://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. > -- 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 https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
