论文标题
光和量子记忆之间有效的可逆纠缠转移
Efficient reversible entanglement transfer between light and quantum memories
论文作者
论文摘要
光和物质之间可逆的纠缠转移是量子信息技术正在进行的发展的至关重要的必要条件。量子网络及其所设想的应用程序，例如，超出直接传输，分布式量子计算或增强感应的安全通信，依靠节点之间的纠缠分布。尽管已经证明了纠缠转移，但当前的障碍是该过程的有限效率，可以损害多步体系结构的可扩展性。在这里，我们证明了基于较大的冷剖果原子的大集合，预言单光子纠缠的有效传递到了两个量子记忆中。我们达到了85％的总体存储和退回效率，并保留了对相干状态的两光子组件的抑制。我们的工作构成了大规模网络和提高功能所需的重要能力。
Reversible entanglement transfer between light and matter is a crucial requisite for the ongoing developments of quantum information technologies. Quantum networks and their envisioned applications, e.g., secure communications beyond direct transmission, distributed quantum computing or enhanced sensing, rely on entanglement distribution between nodes. Although entanglement transfer has been demonstrated, a current roadblock is the limited efficiency of this process that can compromise the scalability of multi-step architectures. Here we demonstrate the efficient transfer of heralded single-photon entanglement into and out-of two quantum memories based on large ensembles of cold cesium atoms. We achieve an overall storage-and-retrieval efficiency of 85% together with a preserved suppression of the two-photon component of about 10% of the value for a coherent state. Our work constitutes an important capability that is needed towards large scale networks and increased functionality.
