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 here).

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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