Future quantum networks will enable the distribution of entanglement between distant locations and allow applications in quantum communication, quantum sensing and distributed quantum computation¹. At the core of this network lies the ability to generate and store entanglement at remote, interconnected quantum nodes². Although various remote physical systems have been successfully entangled^{3,4,5,6,7,8,9,10,11,12}, none of these realizations encompassed all of the requirements for network operation, such as compatibility with telecommunication (telecom) wavelengths and multimode operation. Here we report the demonstration of heralded entanglement between two spatially separated quantum nodes, where the entanglement is stored in multimode solid-state quantum memories. At each node a praseodymium-doped crystal^13,14 stores a photon of a correlated pair¹⁵, with the second photon at telecom wavelengths. Entanglement between quantum memories placed in different laboratories is heralded by the detection of a telecom photon at a rate up to 1.4 kilohertz, and the entanglement is stored in the crystals for a pre-determined storage time up to 25 microseconds. We also show that the generated entanglement is robust against loss in the heralding path, and demonstrate temporally multiplexed operation, with 62 temporal modes. Our realization is extendable to entanglement over longer distances and provides a viable route towards field-deployed, multiplexed quantum repeaters based on solid-state resources.

未来的量子网络将实现远距离位置之间的纠缠分布，并允许在量子通信、量子传感和分布式量子计算¹中的应用。该网络的核心在于能够在远程互连的量子节点²生成和存储纠缠。虽然各种远程物理系统已经成功纠缠^{3,4,5,6,7,8,9,10,11,12}，这些实现都没有涵盖网络操作的所有要求，例如与电信（电信）波长和多模操作的兼容性。在这里，我们报告了两个空间分离的量子节点之间的预示纠缠的演示，其中纠缠存储在多模固态量子存储器中。在每个节点处，掺镨晶体^13,14存储相关对^15的光子，第二个光子在电信波长。以高达 1.4 千赫兹的速率检测到电信光子预示着放置在不同实验室的量子存储器之间的纠缠，并且纠缠在晶体中存储了长达 25 微秒的预定存储时间。我们还展示了生成的纠缠对先驱路径中的损失具有鲁棒性，并展示了具有 62 种时间模式的时间多路复用操作。我们的实现可扩展到更长距离的纠缠，并为基于固态资源的现场部署、多路复用量子中继器提供了一条可行的途径。