One of the assumptions in my sci-fi novel A Reluctant God is that an instantaneous form of communications has been developed. It has essentially infinite range, huge bandwidth, total security and error free. Pretty good, eh? Way sci-fi.
Nobody I know seems aware that the Chinese put up a quantum communications satellite last August. I just found out myself.
Here is a report from January this year saying it's working fine!
So, NASA, DARPA, Prez Trump.... where's the U S of A's response? In A Reluctant God, the "Quantum Statistical Network" was a huge military edge.
(Seems like if one wants to spend a bunch of buck$ on Defense, this would be a starting point.)
Should you get a copy of the book - GREAT idea! - you can read all about the "Quantum Statistical Network" in the "Historical Notes" at the end.
Check the book ad on Amazon.