参考系无关的测量设备无关量子密钥分配研究

Research on Measurement Device Independent Quantum Key Distribution Without a Shared Reference Frame

针对实际的测量设备无关量子密钥分配系统需要辅助校准系统来实现参考系共享,增加了系统复杂性,不利于组网应用的问题,提出了参考系无关的测量设备无关量子密钥分配协议,分析了该协议在弱相干光源以及参量下转换光源条件下的密钥生成率和安全传输距离,研究了有限密钥长度对该协议最终密钥生成率的影响,并与传统测量设备无关量子密钥分配协议的统计波动结果做了对比。仿真结果表明,参考系无关的测量设备无关量子密钥分配协议的安全密钥传输距离十分接近传统的测量设备无关量子密钥分配协议。同时,在有限密钥长度的条件下,要实现相近的安全传输距离,该协议所需要的实际密钥长度要比传统协议低大约5个数量级,极大地提高了协议的效率和实用性。

A reference system independent measurement device independent quantum key distribution protocol is propsoed.The key generation rate and safe transmission distance of the protocol under weak coherent source（WCS）and Parametric down conversion source（PDCS）are analyzed.The effect of finite key on the key generation rate is studied and compared with traditional measurement device independent quantum.And the results of the statistical fluctuation are compared.The simulation results show that the transmission distance of the reference key independent measurement equipment independent quantum key distribution protocol is close to the traditional measurement device independent quantum key distribution.At the same time,under the condition of limited key length,the actual key length required by this protocol is about 5 orders of magnitude lower than that of the traditional protocol,which greatly improves the efficiency and practicability of the protocol.