https://www.theguardian.com/technology/2019/oct/23/google-claims-it-has-achieved-quantum-supremacy-but-ibm-disagrees

Task that would take most powerful supercomputer 10,000 years ‘completed by quantum machine in minutes’

For Google it was a historic announcement: a declaration that it had won the race to achieve “quantum supremacy” – the moment that a futuristic quantum computer performed a task that stumped even the most powerful standard computer in the world.