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Matter
that has been transformed from its natural state
into a computer of the maximum physically achievable efficiency. (An Extropian might argue that this is matter's
"natural state".)
What constitutes "computronium" varies with the level of postulated
technology;
a rod-logic nanocomputer is probably too primitive, since
the basic elements consist of hundreds or thousands of atoms. More likely forms of computronium include
three-dimensional quantum
cellular automata, or exotic forms of
matter such as neutronium, Higgsium, and monopolium. [Definition by Eliezer
Yudkowsky]
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