论文标题
长寿命和多路复用的原子 - 光子纠缠界面，并通过馈送方式控制的读数
Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts
论文作者
论文摘要
产生光子波和自旋波（原子记忆）量子位置纠缠的量子界面（QI）是量子中继器的基本构建块。实践中实现基于合奏的中继器需要量子内存，以提供长寿和多模能力。这些单独的目标已经取得了重大进展。剩下的挑战是将长寿命和多模记忆结合到单个QI中。在这里，通过在激光冷却原子中建立多模，磁场不敏感的和长波长的自旋波储存，这些存储放置在相稳定的偏振干涉仪内，我们构建了一个多路复用的QI，该QI存储了多达三个长寿命长的自旋量子。使用馈送前置控制的系统，我们证明了多路复用的QI与单模QIS相比，原子 - 光子（Photon-Photon）纠缠产生概率增加了3倍。测得的铃铛参数为2.5 +/- 0.1，并结合记忆寿命高达1ms。提出的工作代表了实现基于光纤的长距离量子通信的重要一步。
The quantum interface (QI) that generates entanglement between photonic and spin-wave (atomic memory) qubits is a basic building block for quantum repeaters. Realizing ensemble-based repeaters in practice requires quantum memory providing long lifetime and multimode capacity. Significant progresses have been achieved on these separate goals. The remaining challenge is to combine long-lived and multimode memories into a single QI. Here, by establishing multimode, magnetic-field-insensitive and long-wavelength spin-wave storage in laser-cooled atoms that are placed inside a phase-passively-stabilized polarization interferometer, we constructed a multiplexed QI that stores up to three long-lived spin-wave qubits. Using a feed-forward-controlled system, we demonstrated that the multiplexed QI gives rise to a 3-fold increase in the atom-photon (photon-photon) entanglement-generation probability compared to single-mode QIs. The measured Bell parameter is 2.5+/-0.1 combined with a memory lifetime up to 1ms. The presented work represents a key step forward in realizing fiber-based long-distance quantum communications.
