Photon Pair Coupled in Glass Fiber

Trachman writes: Austrian scientists have discovered a way to couple photon pairs. When two identical photons are coupled and the phase of one is changed, then thanks to the magic of quantum mechanics, the phase of the other photon also changes (abstract). Scientists predict this can advance quantum optics and quantum computations, taking us a step closer to having data transmissions secure from the nosy agencies of the world.

If any of you have expertise in this area, could you share your thoughts on the essence of this discovery and its associated potential practical applications?