There are very strong, for lack of a better word, quantum encryption systems. Usually based on entanglement , two particles become entangled and a change in one causes the same change in the other even across significant distance. This can be used to communicate between two points without the possibility of interception, avoiding the need to encrypt the communications in a traditional way in the first place. Also one system based on I believe unobservability (or is it uncertainty?) that allows the communicating parties to instantly detect if their communications are being intercepted between point a and point b, and act accordingly (like generate a new traditional key and try to send it again). At least this is my non-physics-major understanding of the quantum based encryption techniques. They all require expensive specialized tools and connections, like laser beams or straight point to point fiber optic cables. Not something civilians will be using any time soon imo. In short, traditional encryption scrambles data so that if it is intercepted on the line the attacker can not see the plaintext, quantum encryption techniques transfer data in such a way that it cannot be intercepted in the first place, or can not be intercepted without the interception being immediately detected.