> EDIT: So apparently I have to sign up for an account with yet another service, Readcube? No thanks...
I don't think so (I don't have access to nature journals so I can't check myself) but on the nature page for the article, if you click the share button it should be as a "shareable link" at the top.
http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys...
http://www.readcube.com/articles/10.1038/nphys3196?utm_campa...
PS: Didn't Nature decide to allow free real-only access to all papers? It appears that only the first page is freely accessible.