On Wed, Jul 7, 2021 at 11:50 AM Jason Resch <[email protected]> wrote:

> On Tue, Jul 6, 2021, 9:39 PM Bruce Kellett <[email protected]> wrote:
>
>> 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
>>
>
> By either:
>
> 1. Analyzing the circuit
> 2. Having the circuit do something useful and verifiable (as in my
> factoring example)
> 3. Having the circuit output that it did observe a definite value but
> without reporting which value it observed (as in Deutsch's original example)
>


All of these involve decoherence. You have to show that you can decohere
part of your QC without decohering the rest. I wish you luck!

Bruce

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