From: gts (gts@optexinc.com)
Date: Fri Oct 25 2002 - 09:15:56 MDT
This interesting little gem from scerir seems to have passed by almost
unnoticed in yesterday's flurry of messages to this thread. I am
reposting scerir's words without comment:
> In QM no information can be cloned (xoxed)if
> the number of states is equal or greater than 3
> [Wootters, Zurek, 1982].
>
> Or, in other terms, a cloning (xoxing) of 2 non
> orthogonal states violates the unitarity of evolution
> [D'Ariano, Yuen, 1996].
>
> Or, in other terms, the linearity in QM (linear
> superposition of quantum states) forbids the
> perfect xoxing. Fortunately! Leibniz principle!
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