The book jacket presents this as a novel of hard science fiction, and the field doesn't get much harder than quantum physics. The physics involved is fairly theoretical, and not necessarily explained in a lot of detail, but reasonable as far as it goes.
Nanotechnology plays a significant part in the story as well.
In the same vein, we aren't given many specifics. Interestingly, probably the most powerful technology presented in the book is that of biotechnology. The protagonists are given the ability to analyze, almost instantly, anyone they meet, in addition to being able to make genetic, biochemical, and microbiological changes to themselves and casual contacts, almost on demand. This faculty also extends to the production of nanotechnological devices as needed. Once again, details are rather scarce.