arXiv 2401.040752024-01-08quant-phphysics.atom-ph

中性原子量子处理器之间的高速率高保真度模块化互连

High-rate and high-fidelity modular interconnects between neutral atom quantum processors

Yiyi Li, Jeff Thompson

AI总结：

提出利用光学腔在中性镱原子量子比特间生成远程纠缠的实验协议，通过加载大量原子并利用局域光位移控制耦合，实现高速率高保真度的模块化量子互连，为可扩展量子计算提供实用路径。

摘要：

物理分离模块间的量子链路对于扩展许多量子计算技术至关重要。关键指标是远程Bell对的生成率和保真度。在这项工作中，我们提出了一种使用光学腔在中性镱原子量子比特之间生成远程纠缠的实验协议。通过将大量原子加载到单个腔中，并仅使用局域光位移控制它们的耦合，我们将原子的传输和初始化成本分摊到多次纠缠尝试中，从而最大化纠缠生成率。扭曲环形腔几何结构抑制了许多误差源，允许高保真度纠缠生成。我们估计自旋-光子纠缠率为$5 \ imes 10^5$ s$^{-1}$，Bell对率为$1.0\ imes 10^5$ s$^{-1}$，平均保真度接近$0.999$。此外，我们表明光子检测时间提供了关于误差位置的大量软信息，可用于改善逻辑量子比特性能。这种方法为使用中性镱原子的可扩展模块化量子计算提供了实用路径。

英文摘要：

Quantum links between physically separated modules are important for scaling many quantum computing technologies. The key metrics are the generation rate and fidelity of remote Bell pairs. In this work, we propose an experimental protocol for generating remote entanglement between neutral ytterbium atom qubits using an optical cavity. By loading a large number of atoms into a single cavity, and controlling their coupling using only local light shifts, we amortize the cost of transporting and initializing atoms over many entanglement attempts, maximizing the entanglement generation rate. A twisted ring cavity geometry suppresses many sources of error, allowing high fidelity entanglement generation. We estimate a spin-photon entanglement rate of $5 \times 10^5$ s$^{-1}$, and a Bell pair rate of $1.0\times 10^5$ s$^{-1}$, with an average fidelity near $0.999$. Furthermore, we show that the photon detection times provide a significant amount of soft information about the location of errors, which may be used to improve the logical qubit performance. This approach provides a practical path to scalable modular quantum computing using neutral ytterbium atoms.

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