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
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