Mega Macroscopic Quantum Phenomena

 Yesterday I thought, " what if a Type 1.x civilization on the Kardashev scale built a city-wide quantum computerised world in outer space !?" and the thought just sort of felt so cool.

Just cooling the city to a millionth of a degree above zero is going to take some genius manipulating of petajoules of energy.
Which is sort of funny. That so much heat is what is required to produce so much cold.
Even more fun is the realization that quantum systems work well in a simulation of a heat dead universe - no energy from outside at all, no problem.
Whoah.

The idea comes from macroscopic quantum devices (https://en.wikipedia.org/wiki/Macroscopic_quantum_phenomena) like Josephson Junctions and SQUIDS. 
Technically, qubits millions of times bigger than electrons.

But just modelling any world is not fun. What if we allow evolutionary processes to happen in this world?
Not of life no. No living thing can live in such hellish cold. 
Or can it?
Boltzmann brains?
Anyway, I was thinking more inline with computers running all sorts of quantum machine learning algorithms. (https://en.wikipedia.org/wiki/Evolutionary_computation).

I wonder what weird things these ultra cold superdupercomputers in an environment simulating a dead universe could possibly do.

For one thing, the error rates will be low for a good bunch of these qubits as we shall have kept all the noise away. Indeed, we might easily manage to entangle 10,000 qubits (of which 2^10,000 is more than the number of particles in the observable universe) successfully without a hitch.

Is that super cool or what.






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