Explainer: Google hails 'quantum supremacy', but don't chuck out your PC just yet - Reuters

BERLIN (Reuters) - Researchers at Google say they have achieved'quantum supremacy', in which a computer harnessing the properties of sub-atomic particles did a far better job of solving a problem than the world's most powerful supercomputer. Given the task of finding a pattern in a seemingly random series of numbers, Google's quantum computer produced an answer in 3 minutes and 20 seconds. It estimates that the Summit supercomputer here at the Oak Ridge National Laboratory in Tennessee would take 10,000 years to complete the task. According to Google, such a huge win fulfils the accepted definition of supremacy. Simply put, this entails solving a computing task that a conventional computer would struggle to, or never, complete.