This sounds to me like the Aspect Experiment done around 1979-1980, which was to test if the Einstein-Podolsky-Rosen thought experiment (first discussed in the 1920s iirc) was really possible. The EPR experiment is really spooky as it could be considered to involve faster-than-light signalling, and to put it cautiously its considered by some to be "in tension" with Special Relativity. A safer way of looking at it is that it involves making a pair of particles be in a special spatially spread-out, blurred state. The properties of the pair of particles are set up so that the value of some property of the one particle is always linked to a particular value of the corresponding property of the other particle in the pair. This latter aspect is one kind of example of what's called “quantum entanglement". My memory is failing me, I used to know this stuff once.
It has proved difficult to exploit this for comms, and I haven't read the paper in question, but maybe someone has made some practical progress. One special property of these systems that has been known about for a long time is that an EPR quantum entanglement link is tamper-proof in the sense that an eavesdropper will always destroy the link, so eavesdropping cannot go unnoticed. I don't see any chance of faster-than-light useful comms though.
