https://www.vox.com/science-and-health/2019/10/24/20928714/google-quantum-supremacy-quantum-computers

With a quantum computer, scientists are dipping into deeply weird physics to solve problems.

Scientists at Google on Wednesday declared, via a paper in the journal Nature, that they’d done something extraordinary. In building a quantum computer that solved an incredibly hard problem in 200 seconds — a problem the world’s fastest supercomputer would take 10,000 years to solve — they’d achieved “quantum supremacy.” That is: Google’s quantum computer did something that no conventional computer could reasonably do.