https://thenextweb.com/google/2019/09/23/google-and-nasa-let-it-slip-that-humans-have-achieved-quantum-supremacy/

NASA recently published a Google Research paper indicating the company’s ‘Bristlecone’ quantum computer has successfully completed a processing task in a matter of minutes that would take a classical computer some 10,000 years to complete. Then it mysteriously deleted the research and, to the best of our knowledge, neither organization’s mentioned it since.

The paper’s authors claim this is the world’s first demonstration of quantum supremacy, according to a cached-version available here: