i think that Quantum Computers will contain 'Classic Computer' part, which might as well be ARM Architecture - makes very much sense for me.
ARM Architecture = Advanced RISC Machine.
both ARM Technology & Quantum Technology are complex, but powerful.
i think it's worth to prepare for times when they are combined.
perhaps Quantum Part of Quantum Computer is more than a speed-up device, perhaps it's tool of Advanced Physics, which has other uses than average programmer can imagine.
one of ideas used in Quantum Computing is qbit, something different than 4-state, as not too far as i know.