For 20 years, every serious plan for a quantum computer had an embarrassing problem. Up to 95% of the machine would spend its whole life making its own fuel, leaving about 5% to actually compute anything. Google just found a way around it, and the trick is throwing away 92 out of every 100 tries. Picture buying a car where almost the entire engine exists to refine gas for a tiny motor in the corner. That's roughly where quantum computing has been stuck. The fuel is something physicists call…