That's really cool! I checked Rigetti's github but there seem to be no open source Julia projects there (although, somewhat surprisingly, lots of Common Lisp!). Are you free to say what Julia is being used for at Rigetti (and Intel), and whether there are any plans to release things as open source in the future?
At Intel I developed a few product modeling tools in Julia, including one that's now used in the introduction of every new product. The only real annoyances that I ran into were related to dependency management in Pkg2, but I think Pkg3 should solve all of that. I'm quite new at Rigetti, but I would suggest keeping an eye on our GitHub page.