**Quantum
Cryptography**
Even though in the light of recent advances in quantum
information applied to quantum computing, current digital
cryptography cannot guarantee perfect security, we find
that quantum information provides us with a new type of
security method.
After the BB84 and B92 protocols, there are many outcomes
in quantum cryptography using quantum entanglement, quantum
repeaters to send unlimited transportation of quantum states
by quantum teleportation and quantum optics. Additionally
we have seen that there have been improvements in the principles
of quantum cryptography and security proof. |