Figure3

In quantum networks, after passing through noisy channels or information processing, residual states may lack sufficient entanglement for further tasks, yet they may retain hidden quantum resources that can be recycled. Efficiently recycling these states to extract entanglement resources such as genuine multipartite entanglement or Einstein-Podolsky-Rosen pairs is essential for optimizing network performance. Here, we develop a tripartite entanglement distillation scheme using an eight-photon quantum platform, demonstrating entanglement superactivation phenomena which are unique to multipartite systems. We successfully generate a three-photon genuinely entangled state from two bi-separable states via local operations and classical communication, demonstrating superactivation of genuine multipartite entanglement.Furthermore, we extend our scheme to generate a three-photon state capable of extracting an Einstein-Podolsky-Rosen pair from two initial states lacking this capability, revealing a previously unobserved entanglement superactivation phenomenon. Our methods and findings offer not only practical applications for quantum networks, but also lead to a deeper understanding of multipartite entanglement structures.在量子网络中，经过噪声信道或信息处理后，剩余态可能无法提供足够的纠缠以支撑后续任务，但仍可保留可回收利用的隐藏量子资源。高效回收这类态以提取真多体纠缠（genuine multipartite entanglement）或爱因斯坦-波多尔斯基-罗森对（Einstein-Podolsky-Rosen pairs）这类纠缠资源，对优化量子网络性能至关重要。本文基于八光子量子平台（eight-photon quantum platform）提出了一种三体纠缠蒸馏方案，实验演示了仅多体系统特有的纠缠超激活（entanglement superactivation）现象。我们通过局域操作和经典通信（local operations and classical communication），从两个双可分态（bi-separable states）中成功制备出三光子真纠缠态，验证了真多体纠缠的超激活效应。此外，我们将该方案推广至从两个原本无法提取爱因斯坦-波多尔斯基-罗森对的初始态中，生成可提取该类纠缠对的三光子态，发现了此前未被观测到的纠缠超激活现象。我们的研究方法与成果不仅为量子网络提供了实用应用场景，也有助于更深入地理解多体纠缠的结构特性。