The concept, as far as I understand it, is essentially a quantum analog computer. A classical analog computer emulated differential equations with voltages and currents. In the quantum analog computer, different sorts of analogies are made, but it still relies on physical laws, in this case quantum laws, to determine the final state, and the output of the computation. Personally, I think the whole thing is a crock. They’ve been touting this idea for decades, and whatever success they may eventually proclaim, it won’t amount to a hill of beans.
I have a feeling that whatever is made public is about 10 to 20 years behind what tech the black sites currently have.