基于波分复用技术的参考系无关量子密钥分发

Reference-frame-independent quantum key distribution based on wavelength division multiplexing technology

因参考系无关的量子密钥分发(RFI-QKD)协议可以使量子密钥分发(QKD)系统在没有参考系校准的情况下获得理想的密钥率和传输距离,所以引起了广泛的关注。提出了一种基于波分复用(WDM)技术的RFI-QKD协议。在该协议中,发送方Alice制备多路不同波长的信号,利用WDM技术传递给接收方Bob。Bob在接收到光脉冲后,利用波分解复用器将不同波长的信号分开后测量,并结合诱骗态计算最终的安全密钥率。仿真结果表明:基于WDM RFI-QKD的密钥生成率受到复用路数与传输距离的影响,随着复用路数的增加而增加,因此运用WDM技术是提高密钥率的一个有效方法。

As reference-frame-independent quantum key distribution(RFI-QKD)protocol can make quantum key distribution(QKD)system obtain the ideal key rate and transmission distance without reference system calibration,thus it has attracted much attention recently.A new RFI-QKD protocol based on wavelength division multiplexing(WDM)is proposed.In this protocal,Alice prepares multiple signals of different wavelengths and transmits them to the receiver Bob by using WDM technology.After receiving the optical pulse,Bob uses the wave decomposition multiplexer to separate the signals of different wavelengths and then measures them,and at last calculates the final security key rate by combining the decoy state.Simulation results show that the key generation rate based on WDM RFI-QKD is affected by multiplexing channel number and transmission distance,and it increases with the increase of multiplexing channel number.Therefore,introducing of WDM technology is an effective way to improve key rate.