基于多晶体指示源的测量设备无关量子密钥分配协议

Measurement-Device-Independent Quantum Key Distribution Protocols Based on Multiple Crystal Heralded Source

为提高测量设备无关量子密钥分配协议的性能,研究了基于多晶体指示源和脉冲位置调制的测量设备无关量子密钥分配协议。在多晶体指示源下,比较了有脉冲位置调制和无脉冲位置调制下测量设备无关量子密钥分配协议性能的优劣。仿真结果表明,引入脉冲位置调制可以提高该协议的密钥生成率并增大安全传输距离。并且,随着时隙的增加,密钥生成率逐渐提高,安全传输距离也逐渐增大。随后,进一步地分析了探测器在不同探测效率下,安全传输距离与密钥生成率之间的关系。结果表明,探测器探测效率越高,密钥生成率越高,安全传输距离越长。

This paper studies a measurement-device-independent quantum key distribution protocol based on a multiple crystal heralded source and pulse position modulation to improve its performance.The performances of the protocols with or without pulse position modulation are compared under the multiple crystal heralded source.The simulation results show that the application of pulse position modulation can further improve the key generation rate and increase secure transmission distance of the protocol.Moreover,as the time slot increases,the key generation rate and the secure transmission distance gradually rise.Furthermore,we analyze the relationship between the secure transmission distance and the key generation rate under different detection efficiencies of the detector.The results show that the higher detection efficiency of the detector leads to the greater key generation rate and the longer secure transmission distance.