Putting this at the top so it doesn't vanish as quickly.
If you're interested in the Quantum Physics stuff the US has several companies doing that same thing I worked at one for 7 years called AOSense, in Sunnyvale then, now in Fremont, CA. The other prominent one I know of us is Vector Atomic which ironically was started by people who left AOSEnse because they wanted the CEO to sell the company to get more funding and he didn't want to. VA just recently got acquired.
They do exactly what the Australian company did. It's all DARPA funded and the original use case was submarines which currently have to surface periodically to get their bearings because GPS doesn't work well under water. AOSEnse was a fun place to work almost everyone there was PHD physicists, many from Stanford, I was the Facilities manager, I saw with accounting and the rest of the company all physicists.
AOSense by the way was in part founded by the late James Spilker a Stanford guy who ironically was one of the pioneers of GPS but realized it's limits.