Huh? Why do you think it would take a quantum processor to emulate the xbox? as far as computer processing power, it's not very demanding. The biggest problem isn't having powerful enough computers. It's just nobody has put any serious work into emulating the console. But modern computers would be able to run it
Windows 11 64 bit OS
Intel Core i7-10700
Nvidia GeForce RTX 2060 6GB
32GB DDR4 RAM