arXiv 2207.136802022-07-27quant-phphysics.atom-ph

利用量子频率转换实现囚禁离子量子比特与780 nm光子的纠缠

Entanglement between a trapped ion qubit and a 780-nm photon via quantum frequency conversion

John Hannegan, James D. Siverns, Qudsia Quraishi

DOI：: 10.1103/PhysRevA.106.042441

摘要：

未来的量子网络将需要能够在物质量子比特不自然发射的光子频率下产生物质-光子纠缠。这允许混合网络架构，其中这些光子可以耦合到其他工具和量子技术，用于多路复用，路由和存储等任务，但其工作波长与物质量子位源的波长不同，同时也减少了网络损耗。在这里，我们展示了被困离子和780 nm光子之间的纠缠，该波长可以与基于中性Rb的量子网络设备相互作用。单个钡离子用于产生与离子纠缠的493 nm光子，然后将其频率转换为780 nm，同时保持纠缠。我们产生的离子-光子纠缠度分别为$\geq$ 0.93（2）和$\geq$ 0.84（2），对于493 nm和780 nm的光子，保真度下降主要是由于我们的探测器在780 nm处的信噪比比在493 nm处降低。

英文摘要：

Future quantum networks will require the ability to produce matter-photon entanglement at photon frequencies not naturally emitted from the matter qubit. This allows for a hybrid network architecture, where these photons can couple to other tools and quantum technologies useful for tasks such as multiplexing, routing, and storage, but which operate at wavelengths different from that of the matter qubit source, while also reducing network losses. Here, we demonstrate entanglement between a trapped ion and a 780 nm photon, a wavelength which can interact with neutral-Rb-based quantum networking devices. A single barium ion is used to produce 493 nm photons, entangled with the ion, which are then frequency converted to 780 nm while preserving the entanglement. We generate ion-photon entanglement with fidelities $\geq$ 0.93(2) and $\geq$ 0.84(2) for 493 nm and 780 nm photons respectively with the fidelity drop arising predominantly from a reduction in the signal-noise of our detectors at 780 nm compared with at 493 nm.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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英文摘要：

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