Is USA behind China in quantum satellite technology race?
There have been 3 breakthroughs in Quantum Computing:
Adiabiatic Quantum Computer. Canadian company D-Wave is the leader.
Normal Quantum Computing. USA is the leader.
Quantum communication based on quantum entanglement. China has developed the longest range entanglement possible so far (90 miles vs. 30 miles). Its a leap but not that serious.
Not any close, as far as I know.
Austria, Australia, US and Canada seem at the forefront -- based on theoretical contributions, engineering efforts, as well as working implementations, many of which have been working for 10 years now.
If you ask if China is leading in claimed results in quantum communication technology, the answer may be different - I don't know.
It's hard to know for sure. Those programs are mostly top secret military programs in the US, and no real information of their successes of failures have become public. All we know for sure is the US spends vast sums spying on China, and billions more on high-tech investments. The worst that could be is they are neck and neck in that race