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摘要
A new scheme of quantum key distribution (QKD) using frequency and time coding is proposed, in which the security is based on the frequency-time uncertainty relation. In this scheme, the binary information sequence is encoded randomly on either the central frequency or the time delay of the optical pulse at the sender. The central frequency of the single photon pulse is set as omega(1) for bit 0 and set as omega(2) for bit 1 when frequency coding is selected. However, the single photon pulse is not delayed for bit 0 and is delayed in tau for 1 when time coding is selected. At the receiver, either the frequency or the time delay of the pulse is measured randomly, and the final key is obtained after basis comparison, data reconciliation and privacy amplification. With the proposed method, the effect of the noise in the fiber channel and environment on the QKD system can be reduced effectively.
- 出版日期2010-9
- 单位综合业务网理论及关键技术国家重点实验室; 西安电子科技大学
