On 17 Feb 2012, at 19:13, meekerdb wrote:
On 2/17/2012 1:48 AM, Bruno Marchal wrote:
You forget that Quantum reality is Turing emulable.
A quantum computer can't compute a function that a TM can't. But
when it comes to emulating reality, it seems there is a difference
because quantum reality may be arbitrarily entangled (which is how
decoherence produces quasi-classicality). So there are no strictly
isolated subsystems in a quantum reality.
OK, but still, a quantum computer can simulate any quantum reality
(except infinite quantum Eve Garden, but classical computer cannot
simulate infinite classical Eve garden too, so that does not count
Now take a quantum computer simulating any quantum reality. Despite
the fact that there are no strictly isolated subsystems in that
quantum reality, it can be simulated by a classical computer.
The classical subsystems of that classical computer (emulating the
quantum machine) will just not be part of that quantum reality.
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