They're pretty good at simulating molecules and molecular interactions. I think chemical engineering is probably the killer app for quantum computers.

How would that work? Is there an implementation on a simulator to see how it would work?

There was an article discussing how finance groups like DE Shaw and Two Sigma are investing in quantum computing to get an edge on spotting trends [0]. I wonder how finance groups will learn from this study?

[0]: https://www.ft.com/content/60fded2a-be5a-11e7-b8a3-38a6e068f...

Yes, they can do stuff like fast simulations of quantum mechanics, that should change everything from material sciences and electronics up to medicine.