On Wed, Jul 7, 2021 at 11:29 AM Jason Resch <[email protected]> wrote:

> On Tue, Jul 6, 2021, 4:07 PM 'Brent Meeker' via Everything List <
> [email protected]> wrote:
>
>> On 7/6/2021 10:34 AM, 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.
>>
>> Can you prove that?  How does this quantum intelligence ever arrive at a
>> definite decision?
>>
>
> Prove? No. But I think I can justify it:
>
> 1. Quantum computers are Turing equivalent, they can compute anything a
> classical computer can.
>
> 2. Human brains are believed to operate according to physical laws, all
> known of which are computable.
>
> 3. Humans are conscious.
>
> 4. By any of: Chalmers's principle of "Organizational invariance", or
> "multiple realizability", or the "Generalized Anti-Zombie Principle", or
> the "computational theory of mind", a functionally equivalent computation
> to that of a conscious human brain will be equivalently conscious to that
> brain.
>
> 5. Quantum computers are reversible.
>
> By 1 & 2, a quantum computer can simulate a human brain. By 3 & 4, such an
> emulation will be conscious. By 5 any computation performed by a quantum
> computer can be quantum erased by reversing the circuit back to its
> starting state.
>
> It reaches a definite decision by virtue of completing its processing
> before ultimately being reversed. This prevents an outside observer from
> learning the decision, but it's made nonetheless during the course of the
> processing.
>

How do you know that it has reached a definite decision? Without having it
print out some irreversible record? If it prints out a (pseudo-)classical
record, the initial state is not recoverable.

Bruce

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