The only computer capable of predicting the future definitively is the Universe itself at about one second per second.
Even the so called quantum computers are merely very small subsets of the Universe.
In my humble opinion there is no such thing as eternal predermination. Sure we can predict short term. Even the orbits of the Planets are chaotic and unpredictable long term.
The idea of a clockwork Universe died with Quantum Theory and Chaos Theory. Godel did his bit as well.
Why chaos theory does not apply at the quantum level is that it is quite difficult to have feedback from indeterminate states.
Bert
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