> On 7 Jul 2021, at 09:34, smitra <[email protected]> wrote: > > On 06-07-2021 22:29, 'Brent Meeker' via Everything List wrote: >> On 7/6/2021 12:49 PM, smitra wrote: >>> On 06-07-2021 19:34, Jason Resch wrote: >>>> On Tue, Jul 6, 2021 at 12:27 PM 'Brent Meeker' via Everything List >>>> <[email protected]> wrote: >>>> And you're never going to find a being that behaves intelligently >>>> based on information that can be quantum erased. >>>> You need only a quantum computer with enough qubits. >>>> Jason >>> Indeed, the critics have to show how the laws of physics imply that >>> decoherence cannot be limited to the extent necessary to run a good enough >>> quantum computer simulation of an entire brain for this to work. And one >>> has lots of elbowroom available for the thought experiment. Practical issue >>> that would make this unfeasible for us to do play no role at all, but real >>> physical limits would be valid objections. The amount of available >>> resources that can be used physically is at least a large fraction of all >>> the materials that are present in our galaxy. One can build Dyson spheres >>> around a far fraction of all stars in the galaxy, the available time is at >>> least of the order of tens of billions of years. The simulation does not >>> have to run in real time, each simulated second can take a billion years, >>> which may be necessary to perform enough quantum error correction to make >>> this work. >>> If it can be shown that under more generous conditions this is not >>> feasible, so large scale quantum computing is not going to work even with >>> most of the resources in the observable universe, and that a large scale >>> computation needed for the thought experiment cannot be finished before the >>> end of the universe, then the critics have a point. But even then it's only >>> a hint of a problem, because the objection would only be consistent with >>> the unproven hypothesis that unitary time evolution breaks down when a >>> large enough number of degrees of freedom get entangled with a quantum >>> system. >>> Saibal >> Why are you worrying about enormous quantum computers? A quantum >> computer should have much more computational power than a classical >> computer and we already know of an intelligent classical computer fits >> in a little more than a liter. The problem isn't computational power, >> it's reaching definite answer. Quantum computers in general provide a >> readout by decoherence, and then it's no longer erasable. >> Brent > > > There can never be a definite answer as QM is unitary and decoherence is > never complete. If you assume that the real world is fundamentally different > from a virtual world simulated by a quantum computer, no matter how large > that quantum simulation, then you are assuming that the real world violates > QM in an essential way.
Yes. That is why Bohr has to distinguish the micro-qunatum reality, and the classical macro realm. To believe in a collapse is the same as to believe that the SWE is wrong, and can’t be applied to the observer. Bohr was explicitly dualist. He even believed that the SWE would be wrong at smaller scale. The SWE is the same as the MANY-WORLDS, that is why the pioneer feels necessary to add the collapse postulate, but Everett showed clearly that this was neither necessary, nor even consistent with the idea that the observer obeys to the SWE. Now, we know that Bruce and John disbelieves in the self-indeterminacy in self-multiplication experience, which is inconsistent at a much more basic level, and eventually is the usual confusion between []p and []p & p, i.e. the confusion between first person description and third person description. That is of course vital for understanding SWE without collapse. Bruno > > Saibal > > > > > > > -- > 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/05d3a46c73bbcb9ba1f6c6c0b0b79777%40zonnet.nl. -- 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/FB4CCED3-785D-44CD-8AC1-98794F960BE2%40ulb.ac.be.
