[…] called quantum technologies “potentially revolutionary and disruptive” and classed them as “an element of strategic competition” with rival states […] for components that can have military as well as civilian uses [and potentially] give China a scientific and military edge.

So the article is quite clear, just read it.

Basically, it is what China has always been doing, too. Many argue that China has even harsher rules regarding international collaboration -in both science and economy- and does not show any willingness for reciprocity.