【摘要】 为提高量子通信安全通信距离,提出一种将修正的相干光(MCS)用于诱骗态量子密钥分发的方案.通过削除弱相干光源中的两光子脉冲,降低多光子脉冲的影响,从而提高安全通信距离.理论分析得到了采用MCS后的单光子计数率和误码率的数学表达式.仿真结果表明,在相同的密钥产生率下,此方案将量子通信的安全通信距离提高约10%,接近完美诱骗态方案的安全通信距离.更多还原

【Abstract】 To increase the security distance of quantum communication,a new scheme of decoy state quantum key distribution with a modified coherent state is proposed.The probability of multi-photon pulse in weak coherent source can be decreased by canceling two photon pulses to improve the security distance.Based on the math model of the decoy state QKD,the formula for the yield and error rate of the single photon pulse with the Modified Coherent State is deduced,and substituted in GLLP to calculate the generation rate of quantum keys.Results show that the decoy state with the Modified Coherent State can increase the secure communication distance about 10%,which is very close to that of the perfect decoy state QKD.更多还原