Hi Mirek,

##
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>
> Please be more specific about what do you mean by a quantum counting
> algorithm. Sometimes I'm not too bright guy :-)
Really? Not here I think. The question *was* and *is* fuzzy.
>
>
> Is this what you mean?
> step 1\ |0>
> step 2\ |0> + |1>
> step 3\ |0> + |1> + |2>
> ....
>
Interesting. Perhaps an electron climbing in some way the energy
states at carefully chosen frequences?
>
> or (a classical machine operated by quantum means)
> step 1\ |0>
> step 2\ |1>
> step 3\ |2>
> ....
>
> or something different :-)
My question has perhaps no sense at all. Is there a notion of quantum
computation done without any measurement? Is there a purely unitary
transformation which "augment" the dimensionality of the initial
quantum machine. Does the notion of universal quantum dovetailing
makes sense.
I don't find my Shi papers, but from what I remind, it gives some good
argument about the difficulty of redefining the halting problem
(halting in which universe? ...).
I have no problem with most quantum algorithm, but no clear idea of
what really a quantum computation in general can be, despite I have
few doubt it does really exploits superposed "physical
realities" (assuming QM, that is the SWE).
Don't worry. Sometimes I'm not too bright guy too :-)
Bruno
http://iridia.ulb.ac.be/~marchal/
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