Hybrid QKD Protocol Outperforming Both DV- and CV-QKD Protocols
Hybrid QKD Protocol Outperforming Both DV- and CV-QKD Protocols
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DOI：
10.1109/jphot.2019.2946910
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发表时间：
2020-02-01
影响因子：
2.4
通讯作者：
Djordjevic, Ivan B.
中科院分区：
文献类型：
--
作者：
Djordjevic, Ivan B.
为了克服离散变量（DV）和连续变量（CV） QKD协议的局限性，本文提出了一种混合QKD协议。在提出的混合QKD协议中，Alice在发送端同时对CV-QKD子系统进行基于离散调制（DM）的编码，对DV-QKD进行时相编码，并以优化的每脉冲平均光子数传输这种混合编码脉冲。在接收端，Bob采用1:2的光空间开关，以优化的选择概率选择DV-QKD接收器或CV-QKD接收器。其他兼容的CV-QKD和DV-QKD协议也可以用于混合QKD。Bob进一步执行应用于两个子系统的经典后处理，从而从两个子系统派生出联合安全密钥。所提出的混合QKD协议在保密密钥速率和可实现的传输距离方面显著优于先前引入的基于高斯调制（GM）和基于dm的CV-QKD协议以及DV-QKD协议。
To overcome the limitations of both discrete variable (DV) and continuous variable (CV) QKD protocols, in this paper, a hybrid QKD protocol is proposed. In the proposed hybrid QKD protocol, Alice simultaneously performs discrete modulation (DM)-based encoding for CV-QKD subsystem and time-phase encoding for DV-QKD on a transmitter side and transmits such hybrid encoded pulse with optimized average number of photons per pulse. On receiver side, Bob employs a 1:2 optical space switch to select either DV-QKD receiver or CV-QKD receiver with the optimized probability of selection. Other compatible CV-QKD and DV-QKD protocols can also be used in hybrid QKD. Bob further performs the classical postprocessing applied to both subsystems so that resulting joint secure key is derived from both subsystems. The proposed hybrid QKD protocol significantly outperforms previously introduced both Gaussian modulation (GM)- and DM-based CV-QKD protocols as well as DV-QKD protocols in terms of both secret-key rate and achievable transmission distance.