论文标题
用于量子网络中高保真纠缠流的量子路由器架构
A Quantum Router Architecture for High-Fidelity Entanglement Flows in Quantum Networks
论文作者
论文摘要
在过去的十年中，在实验中实现了量子中继器的基础方面取得了巨大进展。已经提出了带有多重量子记忆的中继器体系结构以提高纠缠分布率，但一个开放的挑战是维持长距离链路上的纠缠忠诚度。在这里，我们使用一个量子路由器体系结构来解决此问题，其中包括在光子总机中连接到跨量子网络的经纪人纠缠流的许多量子记忆。我们使用基于事件的模拟器来计算该体系结构下纠缠分布的速率和保真度，发现路由器会随着多路复用深度的增加而没有显着下降的纠缠分布率，将路由器改善纠缠忠诚度。具体而言，路由器允许频道损失不变的保真度，即可以通过无损链接实现相同的保真度。此外，该方案自动将纠缠范围跨越整个网络的纠正范围排序而无需全局网络信息。拟议的体系结构使用当今的光子技术，为近期可部署的多节点量子网络打开了一条途径。
The past decade has seen tremendous progress in experimentally realizing the building blocks of quantum repeaters. Repeater architectures with multiplexed quantum memories have been proposed to increase entanglement distribution rates, but an open challenge is to maintain entanglement fidelity over long-distance links. Here, we address this with a quantum router architecture comprising many quantum memories connected in a photonic switchboard to broker entanglement flows across quantum networks. We compute the rate and fidelity of entanglement distribution under this architecture using an event-based simulator, finding that the router improves the entanglement fidelity as multiplexing depth increases without a significant drop in the entanglement distribution rate. Specifically, the router permits channel-loss-invariant fidelity, i.e. the same fidelity achievable with lossless links. Furthermore, this scheme automatically prioritizes entanglement flows across the full network without requiring global network information. The proposed architecture uses present-day photonic technology, opening a path to near-term deployable multi-node quantum networks.
