Quantum key distribution (QKD) is a crucial technology for information security in the future. Developing simple and efficient ways to establish QKD among multiple users is important to extend the applications of QKD in communication networks. Herein, we proposed a scheme of symmetric dispersive optics QKD and demonstrated an entanglement-based quantum network based on it. In the experiment, a broadband entangled photon pair source was shared by end users via wavelength and space division multiplexing. The wide spectrum of generated entangled photon pairs was divided into 16 combinations of frequency-conjugate channels. Photon pairs in each channel combination supported a fully connected subnet with eight users by a passive beam splitter. Eventually, it showed that an entanglement-based QKD network over 100 users could be supported by one entangled photon pair source in this architecture. It has great potential on applications of local quantum networks with large user number.

中文翻译：

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基于对称色散光学量子密钥分配的基于纠缠的量子网络

量子密钥分发（QKD）是未来信息安全的关键技术。开发简单有效的方法来在多个用户之间建立QKD对于扩展QKD在通信网络中的应用很重要。在这里，我们提出了一种对称色散光学系统QKD的方案，并证明了基于它的基于纠缠的量子网络。在实验中，最终用户通过波长和空分复用技术共享了一个宽带纠缠光子对源。产生的纠缠光子对的光谱被分成频率共轭通道的16种组合。每个通道组合中的光子对通过一个无源分束器支持一个具有8个用户的完全连接的子网。最终，结果表明，在该体系结构中，一个纠缠的光子对源可以支持100个以上基于纠缠的QKD网络。它在具有大量用户的本地量子网络的应用中具有巨大的潜力。