[yvdriess]

Quantum Cryptography is actually Quantum Key Distribution, an algorithm for securely creating a one-time pad between two peers. The proof that quantum crypto is unconditionally secure is just Shannon's proof.

The benefit of quantum crypto is that you can basically setup or even stream a one-time pad over a public network, without having to trust the middle-man. Another benefit over, say non-linear/chaotic systems is that fibre, line-of-sight wireless and satellite communication already forms the backbone of our network infrastructure.

Now only to solve the single-photon detector hardware issues.