High-fidelity entanglement and detection of alkaline-earth Rydberg atoms
High-fidelity entanglement and detection of alkaline-earth Rydberg atoms
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DOI：
10.1038/s41567-020-0903-z
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发表时间：
2020-05-25
期刊：
影响因子：
19.6
通讯作者：
Endres, Manuel
中科院分区：
文献类型：
--
作者：
Madjarov, Ivaylo S.;Covey, Jacob P.;Endres, Manuel
利用高激发里德堡态实现了中性原子间的高纠缠保真度。碱土金属原子独特的电子结构使其成为各种量子技术应用的理想平台，而囚禁中性原子已成为量子科学的重要平台，其中利用高激发里德堡态实现的纠缠保真度记录已被建立。然而，到目前为止，受控的双量子比特纠缠产生仅限于碱性物质，使得更复杂的电子结构的开发成为一个开放的前沿，这可能导致改进的量子效率和根本不同的应用，如量子增强光学时钟。在这里，我们展示了一种新的方法，利用个别碱土里德伯原子的二价电子结构。我们发现里德堡态检测，单原子拉比操作和两原子纠缠的性能超过以前公布的值。我们的研究结果为新的应用铺平了道路，包括可编程量子计量学和混合原子-离子系统，并为基于碱土金属的量子计算架构奠定了基础。
High entanglement fidelity between neutral atoms is achieved using highly excited Rydberg states. The unique electron structure provided by alkaline-earth atoms makes it a promising platform for various quantum-technology-based applications.Trapped neutral atoms have become a prominent platform for quantum science, where entanglement fidelity records have been set using highly excited Rydberg states. However, controlled two-qubit entanglement generation has so far been limited to alkali species, leaving the exploitation of more complex electronic structures as an open frontier that could lead to improved fidelities and fundamentally different applications such as quantum-enhanced optical clocks. Here, we demonstrate a novel approach utilizing the two-valence electron structure of individual alkaline-earth Rydberg atoms. We find fidelities for Rydberg state detection, single-atom Rabi operations and two-atom entanglement that surpass previously published values. Our results pave the way for novel applications, including programmable quantum metrology and hybrid atom-ion systems, and set the stage for alkaline-earth based quantum computing architectures.