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量子密钥分配过程中制备诱骗态信号易引入一些边信息(频率、脉冲宽度等),窃听者可利用这些信息来分辨信号态和诱骗态。因此,提出了基于参量下转换光源和被动诱骗态方案的测量设备无关量子密钥分配协议,分析了其密钥生成率、单光子计数率以及单光子误码率与安全传输距离的关系。仿真结果表明,基于参量下转换光源的被动测量设备无关量子密钥分配协议的密钥安全传输距离达到285 km,远高于基于改造后可输出两路相关信号的弱相干光源的被动测量设备无关量子密钥分配协议,十分接近基于主动诱骗态的测量设备无关量子密钥分配协议,且克服了主动诱骗态方案可能引入边信息的缺点。
During the process of quantum key distribution, the decoy state signal can easily introduce some side information (frequency, pulse width, etc.). The eavesdropper can use this information to distinguish the signal state from the lure state. Therefore, an irrelevant quantum key distribution protocol based on parametric down-conversion light source and passive decoy scheme is proposed. The relationship between key generation rate, single-photon counting rate and single-photon bit error rate and safe transmission distance is analyzed. The simulation results show that the key-safe transmission distance of the passive quantum device based on parametric down-conversion light source is up to 285 km, which is much higher than that of the passive measurement device based on the weak coherent light source that can output two correlated signals after reconstruction The quantum key distribution protocol is very close to the measurement-device-independent quantum key distribution protocol based on the active decoy state and overcomes the defect that the active decoy state scheme may introduce edge information.