| Quantum Key Distribution (QKD) is based on the principle of quantum mechanics. First,this paper makes a study of the quantum cryptography technique,discusses the cause of quantum key and distribution in the quantum communication and the principle of quantum key distribution protocol in the communication by combining the application of quantum key protocol in the communication .Second,known solutions for synchronization of signal in QKD are researched. Atom-clock synchronization, delay-time synchronization of signal,laser pulse synchronization and light synchronization which is the best of the four solutions are described, respectively. According to the weekness of light synchronization,a new resived case has been given.Problems in quantum cryptography research were analyzed and some constructive suggestions are proposed.Last,the development of quantum cryptography is prospected. |
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