Establishing quantum entanglement between individual nodes is crucial for building large-scale quantum networks, enabling secure quantum communications, distributed quantum computing, enhanced quantum metrology, and fundamental tests of quantum mechanics. However, the shared entanglements have been merely observed in either extremely low-temperature or well-isolated systems, which limits quantum networks for real-life applications. Here, we report the realization of heralding quantum entanglement between two atomic ensembles at room temperature, which are contained in two spatially separated, centimeter-sized vapor cells. By mapping the atomic state onto a photonic state after the readout process, we measure the quantum interference of the Raman-scattered photons and reconstruct the entangled state, then we strongly verify the existence of a single excitation delocalized in two atomic ensembles. The demonstrated building block paves the way to construct quantum networks and distributing entanglement across multiple remote nodes at ambient conditions.

中文翻译：

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预示两个室温原子系综之间的量子纠缠

在各个节点之间建立量子纠缠对于构建大规模量子网络、实现安全的量子通信、分布式量子计算、增强的量子计量学和量子力学的基本测试至关重要。然而，共享纠缠仅在极低温或隔离良好的系统中观察到，这限制了量子网络在现实生活中的应用。在这里，我们报告了室温下两个原子系综之间的量子纠缠的实现，它们包含在两个空间分离的厘米大小的蒸气室中。通过在读出过程后将原子态映射到光子态，我们测量拉曼散射光子的量子干涉并重建纠缠态，然后我们强烈验证了在两个原子系综中离域的单个激发的存在。演示的构建块为构建量子网络和在环境条件下跨多个远程节点分布纠缠铺平了道路。