Zero-Added-Loss Entangled-Photon Multiplexing for Ground- and Space-Based Quantum Networks
Zero-Added-Loss Entangled-Photon Multiplexing for Ground- and Space-Based Quantum Networks
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DOI：
10.1103/physrevapplied.19.054029
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发表时间：
2022-06
影响因子：
4.6
通讯作者：
Kevin C. Chen;Prajit Dhara;M. Heuck;Yuan Lee;W. Dai;S. Guha;D. Englund
中科院分区：
文献类型：
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作者：
Kevin C. Chen;Prajit Dhara;M. Heuck;Yuan Lee;W. Dai;S. Guha;D. Englund
提出了一种基于准确定性纠缠光子对源的量子网络中的光纠缠分配方案。通过将光子贝尔对产生与光谱模式转换相结合以与量子存储器接口，该方案消除了由于复用而引起的开关损耗。我们分析了这种“零附加损耗复用”（ZALM）贝尔对源，用于通过卫星和地面存储器进行长基线纠缠分发的特别具有挑战性的问题，在那里它释放了额外的优势：（i）与上行链路与现实的自适应光学，和（ii）光子损失发生在与量子存储器相互作用之前-即，Alice和Bob接收而不是发送--将纠缠生成速率缩放提高了$\mathcal{O}（\sqrt{\eta}）$。基于数值分析，我们估计我们的协议在存储器复用10^2 $自旋量子比特时，对地距离$> 10^2 $~$km，自旋-自旋Bell态保真度超过99$~$ebits/s.我们的架构为在短期内实现全球规模的量子网络提供了蓝图。
We propose a scheme for optical entanglement distribution in quantum networks based on a quasi-deterministic entangled photon pair source. By combining heralded photonic Bell pair generation with spectral mode conversion to interface with quantum memories, the scheme eliminates switching losses due to multiplexing. We analyze this `zero-added-loss multiplexing' (ZALM) Bell pair source for the particularly challenging problem of long-baseline entanglement distribution via satellites and ground-based memories, where it unlocks additional advantages: (i) the substantially higher channel efficiency $\eta$ of \textit{downlinks} vs.\ \textit{uplinks} with realistic adaptive optics, and (ii) photon loss occurring \textit{before} interaction with the quantum memory -- i.e., Alice and Bob receiving rather than transmitting -- improve entanglement generation rate scaling by $\mathcal{O}(\sqrt{\eta})$. Based on numerical analyses, we estimate our protocol to achieve $>$10$~$ebits/s at memory multiplexing of $10^2$ spin qubits for ground distance $>$10$^2~$km, with the spin-spin Bell state fidelity exceeding 99$\%$. Our architecture presents a blueprint for realizing global-scale quantum networks in the near-term.