Quantum repeaters, which are indispensable for long-distance quantum communication, are necessary for extending the entanglement from short distance to long distance; however, high-rate entanglement distribution, even between adjacent repeater nodes, has not been realized. In a recent work by [C. Jones et al., New J. Phys. 18 (2016) 083015], the entanglement distribution rate between adjacent repeater nodes was calculated for a plurality of quantum dots, nitrogen-vacancy centers in diamond, and trapped ions adopted as quantum memories inside the repeater nodes. Considering practical use, arranging a plurality of quantum memories becomes so difficult with the state-of-the art technology. It is desirable that high-rate entanglement distribution is realized with as few memory crystals as possible. Here, we propose new entanglement distribution scheme with one quantum memory based on the atomic frequency comb which enables temporal multimode operation with one crystal. The adopted absorptive-type quantum memory degrades the difficulty of multimode operation compared with the previously investigated quantum memories directly generating spin-photon entanglement. It is shown that this scheme improves the distribution rate by nearly two orders of magnitude compared with the result in [C. Jones et al., New J. Phys. 18 (2016) 083015] and the experimental implementation is close by utilizing state-of-the-art technology.

中文翻译：

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具有吸收型存储器的量子中继器节点之间的纠缠分布

长距离量子通信不可缺少的量子中继器，对于将纠缠从短距离延伸到长距离来说是必不可少的；然而，即使在相邻中继器节点之间，也没有实现高速纠缠分布。在 [C. Jones 等人，New J. Phys。18（2016）083015]，计算了相邻中继器节点之间的纠缠分布率，用于多个量子点、金刚石中的氮空位中心以及作为中继器节点内部的量子存储器的俘获离子。考虑到实际应用，使用最先进的技术布置多个量子存储器变得非常困难。希望用尽可能少的存储晶体实现高速纠缠分布。这里，我们提出了一种基于原子频率梳的具有一个量子存储器的新纠缠分布方案，该方案能够使用一个晶体进行时间多模操作。与先前研究的直接产生自旋光子纠缠的量子存储器相比，采用的吸收型量子存储器降低了多模操作的难度。结果表明，与[C. Jones 等人，New J. Phys。18 (2016) 083015] 并且通过利用最先进的技术，实验实现非常接近。与先前研究的直接产生自旋光子纠缠的量子存储器相比，采用的吸收型量子存储器降低了多模操作的难度。结果表明，与[C. Jones 等人，New J. Phys。18 (2016) 083015] 并且通过利用最先进的技术，实验实现非常接近。与先前研究的直接产生自旋光子纠缠的量子存储器相比，采用的吸收型量子存储器降低了多模操作的难度。结果表明，与[C. Jones 等人，New J. Phys。18 (2016) 083015] 并且通过利用最先进的技术，实验实现非常接近。