http://www.sciencemag.org/news/2019/09/quantum-computer-bests-all-conventional-computers-first-claim-supremacy

Google researchers in Santa Barbara say their advance may lead to near-term applications of quantum computers.

The age of quantum computing may have begun not with a flashy press conference but with an internet leak. According to a paper posted briefly--and presumably mistakenly--to a lab site, physicists at Google have used a quantum computer to perform a calculation that would overwhelm the world's best conventional supercomputer. Although the specific computation has no known use, the result means that scientists have passed a milestone known as "quantum supremacy."