As I explained above, we already have a term for "a device which is proven to execute computation using quantum effects"; we call it a "computer". All practical computers (since the transition from vacuum tubes to transistors, and arguably before that) depend on quantum effects for their computation. Transistor action is a quantum-mechanical effect, which is why the Boltzmann constant pops up in the middle of the Ebers–Moll equation.

Please do not resort to personal attacks on this site. Your repeated insulting remarks do not rise to the standards of behavior we attempt to maintain here.