If they're using quantum entanglement, in theory, than distances don't matter as the two particles, now "entangled", act as one even when separated. If the Chinese worked this out, it would be hack-proof as there is nothing actually transmitted between the particles as they've now been "entangled" at a quantum, non-dimensional, level.
How did they get the entangled photon in the satellite and how do they contain it - aren’t photons moving at the speed of light?