https://www.reuters.com/article/us-alphabet-quantum-explainer/explainer-google-hails-quantum-supremacy-but-dont-chuck-out-your-pc-just-yet-idUSKBN1X21ZP >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.