PB
Quick take: What China’s done is completely different than what Google did. In essence, China’s built a machine that can only run the experiment it’s described as demonstrating quantum supremacy through. In other words: it doesn’t actually solve any problems, which makes its designation as a computer somewhat honorary.
Google’s machine, on the other hand, is ‘programmable.’ This means it could, theoretically, be adapted to solve one or more problems.
https://thenextweb.com/neural/2020/12/04/china-claims-it-built-a-quantum-computer-thats-10-billion-times-faster-than-googles/