Stathis Papaioannou wrote:
On 4 May 2015 at 15:57, Bruce Kellett <bhkell...@optusnet.com.au> wrote:
Stathis Papaioannou wrote:
On 4 May 2015 at 14:38, LizR <lizj...@gmail.com> wrote:
Yes. I've mentioned occasionally that if the substitution level is
quantum,
then no-cloning may be a problem, at least in principle. The usual answer
is
that the subst level is WAY above quantum - that our experiences and
hence
the famous "observer moments" aren't anywhere near to the Planck time or
length.
If the substitution level is quantum then no-cloning may be a problem
in practice, but not in principle.
??
The no-cloning theorem would rule out quantum level substitution *in
principle* as far as I can tell.
No, it would mean you can't copy someone at will, but it does not rule
out copying per se - it does not rule out the possibility of two or
more identical quantum states.
What is the point of two identical quantum states if you don't know
which two are identical? It seems to me that copying at will is what is
required. We are not talking about a copy by random chance, or about an
incidental copy in some other (disjoint) portion of the multiverse.
Bruce
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