基于波分复用技术的测量设备无关量子密钥分发
首发时间:2016-05-19
摘要:测量设备无关的量子密钥分发,可以抵御基于探测器的所有攻击,提高了量子密钥分发的实际应用安全性。本文在基于诱骗态测量设备无关量子密钥分发协议的基础上,提出了一种基于波分复用技术的测量设备无关量子密钥分发协议。通信双方Alice 和Bob同时发送多路不同波长的信号,通过光复用器将多路信号合并起来,通过单根光纤进行长距离传输。第三方Charlie通过光解复用器将多路信号分开,用多个独立测量设备同时对每一路进行贝尔态测量,该协议将极大地提升量子密钥分发协议的密钥生成率。理论分析结果显示协议的密钥生成率将与系统的传输距离、复用路数和信号态的平均光子数目有关。数值仿真结果表明,所提出协议在不增加系统传输设备的前提下,极大地提高了系统的密钥生成率;当传输距离为150km时,单路的密钥生成率为0.17 Mbps,20路复用的密钥生成率可达3.34Mbps,40路复用的密钥生成率达到6.68Mbps。
关键词: 量子光学 量子密钥分发 波分复用 测量设备无关 密钥生成率
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Wavelength Division Multiplexing for Measurement-Device-Independent Quantum Key Distribution
Abstract:Measurement-device-independent quantum key distribution (MDI-QKD) is immune to all the detector attacks and improves the security of the practical QKD system. In this paper, the MDI-QKD scheme with the wavelength division multiplexing (WDM) technique and the decoy state method is proposed. In the scheme, both sender and receiver execute multi-channel QKD by using wavelength division multiplexing technique, and share a fiber channel for long distance transmission. The third party, Charlie, performs the Bell-state measurement for each sub-channel signal, which has been separated by wavelength division de-multiplexer. The results illustrate that the key generation rate is determined by the transmission distance, the numbers of sub-channels for multiplexing and the mean photon numbers of signal states. Moreover, the simulated results show that the proposed scheme could dramatically increase the system's key generation rates. For example, when the transmission distance is 150km, the key generation rate without WDM is 0.17Mbps, whereas the key generation rate with 20 channels WDM and with 40 channels WDM reaches 3.34Mbps and 6.68Mbps, respectively.
Keywords: quantum optics quantum key distribution wavelength division multiplexing measurement device independent key generation rates
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