论文标题
带有波形 - 多头量子记忆的纠缠分布
Entanglement distribution with wavevector-multiplexed quantum memory
论文作者
论文摘要
长距离量子纠缠的可行分配仍然是迈向量子安全通信和量子网络实现的基本步骤。基于量子记忆的量子中继器节点有望克服量子通信光学实现固有的指数信号衰减。尽管当前量子记忆的性能阻碍了其实际应用，但具有多重型的多模用解决方案可以大大提高纠缠分布率。我们建议使用波动 - 媒介原子原子量子记忆（WV-MUX-QM）作为多路复用量子中继器体系结构的基本块。我们展示了WV-MUX-QM平台，可在延长距离内提供准决策的纠缠生成，即使使用当前可用的量子存储器设备，也可以减轻光学损失的基本问题，并超过Repeathless Solutions以及其他基于Repeater的协议（例如时间多重）。我们将每次使用的节点数量的纠缠位（EBIT）率建立为反映较大节点距离的成本效益的实用值。
Feasible distribution of quantum entanglement over long distances remains a fundamental step towards quantum secure communication and quantum network implementations. Quantum repeater nodes based on quantum memories promise to overcome exponential signal decay inherent to optical implementations of quantum communication. While performance of current quantum memories hinders their practical application, multimode solutions with multiplexing can offer tremendous increase in entanglement distribution rates. We propose to use a wavevector-multiplexed atomic quantum memory (WV-MUX-QM) as a fundamental block of a multiplexed quantum repeater architecture. We show the WV-MUX-QM platform to provide quasi-deterministic entanglement generation over extended distances, mitigating the fundamental issue of optical loss even with currently available quantum memory devices, and exceeding performance of repeaterless solutions as well as other repeater-based protocols such as temporal multiplexing. We establish the entangled-bit (ebit) rate per number of employed nodes as a practical figure of merit reflecting the cost-efficiency of larger inter-node distances.
