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基于实际量子密钥分配系统中所使用的强衰减的激光脉冲不是单光子 ,量子密钥分配的信道不是无损耗的 ,光子计数器存在探测效率和暗计数以及窃听者的技术能力也不是无限的这些具体问题 .采用了分束与Breidbart基相结合的窃听策略讨论了窃听问题并给出了合法用户在筛选后的密钥中所能容忍的误码率上限公式 .
Laser pulses based on strong decay used in real quantum key distribution systems are not single photons, quantum key distribution channels are not lossless, photon counters have detection efficiencies and dark counts, and the eavesdropper’s technical abilities are not unlimited either The specific problem is solved by using the tapping strategy combined with the splitter and Breidbart basis.The eavesdropping problem is discussed and the upper bound of the error rate that the legitimate user can tolerate in the filtered key is given.