In traditional quantum key distribution protocols the key is a random string produced in process of key distribution. This study provides a quantum deterministic key distribution protocol based on the non-locality of quantum entangled states. A predetermined string can be distributed to two parts as the key by virtue of the property of EPR (Einstain-Rosen-Podolsky) pair. The laws of quantum mechanics guarantee that the protocol is unconditionally secure. All operations needed in the protocol have already been mature technology in laboratory. So, it is easy to carry out in practice. The protocol can be widely applied in military and commercial affairs.
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