Hua Ximing, Hu Min, Guo Banghong
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China.
National Quantum Communication (Guangdong) Co., Ltd., Guangzhou 510535, China.
Entropy (Basel). 2022 Jun 18;24(6):841. doi: 10.3390/e24060841.
As a multi-particle entangled state, the Greenberger-Horne-Zeilinger (GHZ) state plays an important role in quantum theory and applications. In this study, we propose a flexible multi-user measurement-device-independent quantum key distribution (MDI-QKD) scheme based on a GHZ entangled state. Our scheme can distribute quantum keys among multiple users while being resistant to detection attacks. Our simulation results show that the secure distance between each user and the measurement device can reach more than 280 km while reducing the complexity of the quantum network. Additionally, we propose a method to expand our scheme to a multi-node with multi-user network, which can further enhance the communication distance between the users at different nodes.
作为一种多粒子纠缠态，格林伯格-霍恩-泽林格（GHZ）态在量子理论及应用中发挥着重要作用。在本研究中，我们基于GHZ纠缠态提出了一种灵活的多用户测量设备无关量子密钥分发（MDI-QKD）方案。我们的方案能够在多个用户之间分发量子密钥，同时抵御检测攻击。我们的模拟结果表明，每个用户与测量设备之间的安全距离可达280多公里，同时降低了量子网络的复杂度。此外，我们还提出了一种将我们的方案扩展到多节点多用户网络的方法，这可以进一步增加不同节点用户之间的通信距离。
