On 8/7/2019 2:23 AM, Bruno Marchal wrote:
On 6 Aug 2019, at 20:00, 'Brent Meeker' via Everything List
<[email protected]
<mailto:[email protected]>> wrote:
On 8/6/2019 6:38 AM, Bruno Marchal wrote:
If the QC does its task effectively, the output basis qbits will be
put into definite states,
Relatively to the observer, but in the global state, the observer
will inherit the superposition state, by linearity of the tensor
products and of the evolution.
In something like Shor's algorithm there is only one final state with
non-vanishing probability. Yet this is the kind of algorithm that
Deutsch cites as proving there must be many worlds.
Can you wrote a classical emulator of the algorithm of Shor which does
not emulate the “parallel computation”?
I have never succeeded. I agree that this proves nothing, but QM
without the superposition (the parallel histories) does not (yet) make
any sense to me. That there is only one final state does not explain
how shor’s algorithm works without the intermediate superposed states.
Do you not see that there is only one intermediate state and the
superposition is an artifact of expressing the state relative to a
certain basis?
Brent
It is the same with Deutsch Josza problem, and some others. In fact,
as Deutsch said and explain well, even the two slits experiment is
hard to explain without attributing a physical existence to the
superposed state. The difference of the behaviour between pure sate
and mixture seems to impose some notion of parallel histories.
Bruno
Brent
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