Liu Jingyuan, Liu Dongning, Jin Zhanping, Lin Zhihao, Li Hao, You Lixing, Feng Xue, Liu Fang, Cui Kaiyu, Zhang Wei, Huang Yidong
Department of Electronic Engineering, Tsinghua University, Frontier Science Center for Quantum Information, Beijing National Research Center for Information Science and Technology (BNRist), Beijing 100084, China.
National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
Sci Adv. 2024 Dec 13;10(50):eado9822. doi: 10.1126/sciadv.ado9822.
Leveraging the unique properties of quantum entanglement, quantum entanglement distribution networks support multiple quantum information applications and are essential to the development of quantum networks. However, practical implementation poses fundamental challenges to network scalability and flexibility. Here, we propose a reconfigurable entanglement distribution network scheme based on tunable multipump excitation of a spontaneous four-wave mixing (SFWM) source and a time-sharing method. We characterize the two-photon correlation under different pump conditions to demonstrate the effect of pump degenerate and pump nondegenerate SFWM processes on the two-photon correlation and its tunability. Then, as a benchmark application, a 10-user fully connected quantum key distribution network is established in a time-sharing way with triple pump lights. Our results provide a promising networking scheme for large-scale entanglement distribution networks owing to its scalability, functionality, and reconfigurability.
利用量子纠缠的独特特性，量子纠缠分布网络支持多种量子信息应用，并且对于量子网络的发展至关重要。然而，实际实现对网络的可扩展性和灵活性提出了根本性挑战。在此，我们提出一种基于自发四波混频（SFWM）源的可调谐多泵浦激发和时分复用方法的可重构纠缠分布网络方案。我们表征了不同泵浦条件下的双光子相关性，以证明泵浦简并和泵浦非简并SFWM过程对双光子相关性及其可调谐性的影响。然后，作为一个基准应用，利用三束泵浦光以时分复用方式建立了一个10用户全连接量子密钥分发网络。由于其可扩展性、功能性和可重构性，我们的结果为大规模纠缠分布网络提供了一种很有前景的组网方案。
