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Quantum key distribution is the use of quantum mechanics properties to ensure the security of the communication. It can make communication both output and share a random security key, to encrypt and decrypt information. According to the principle of quantum not cloning, known quantum states cannot be reproduced exactly, namely the eavesdropper cannot replicate the same "key" to the corresponding decoding information encrypted; According to the theory of information interference and Werner Heisenberg uncertainty principle, any test in the process of communication eavesdropping, will destroy key protective layer, so that the transfer both sides know that the existence of the eavesdropper and his contact information.
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