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Because of thermal noise these things are very cold. At that point the wires are superconducting so you need not worry about that type of losses. None of the advantages of optical processing translate from the classical regime to the quantum.

Not all quantum computers use superconducting qubits:

http://www.digitaltrends.com/features/dt10-quantum-computing...

You're suggesting putting a Ferrari chassis around a 6hp outboard motor. A quantum computer is not a fast computer, it is a different kind of computer.

I mean, the wires are only relevant to the control of the machinery (not the actual computation) and these aren't photonic quantum computers anyway. What's the point of putting a bunch of optical fibers with electronic emitters and receivers on both sides?