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
<everything-list@googlegroups.com> 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
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