State-Insensitive Trapping of Alkaline-Earth Atoms in a Nanofiber-Based Optical Dipole Trap
State-Insensitive Trapping of Alkaline-Earth Atoms in a Nanofiber-Based Optical Dipole Trap
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DOI：
10.1103/prxquantum.4.040308
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发表时间：
2022-11
期刊：
影响因子：
9.7
通讯作者：
G. Kestler;K. Ton;D. Filin;C. Cheung;P. Schneeweiss;T. Hoinkes;J. Volz;M. S. Safronova;A. Rauschenbeutel;J.T. Barreiro
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文献类型：
--
作者：
G. Kestler;K. Ton;D. Filin;C. Cheung;P. Schneeweiss;T. Hoinkes;J. Volz;M. S. Safronova;A. Rauschenbeutel;J.T. Barreiro
在纳米光纤的倏逝光势中捕获的中性原子是发展量子技术和探索量子网络和量子电动力学等基础科学的一个有前途的平台。建立在成功的进步与被困碱金属原子，在这里，我们展示了一个状态不敏感的光学偶极陷阱锶-88，碱土金属原子，使用nanotapered光纤的倏逝场。利用$\sim\！\的低激光冷却温度1~\mu$K容易实现与锶，我们证明捕获在记录低陷阱深度对应于$\sim\！3~\mu$K.此外，采用双魔波长捕获方案，我们实现了在千赫兹宽的$5s^{2}^{1}上的状态不敏感捕获。S_{0}-5s5p\;^{3}\！P_{1，|M| =1}$冷却过渡，我们通过执行原子过渡的近表面高分辨率光谱来验证。这使我们能够在实验上发现并验证理论预测的幻波长435.827（25）nm附近的陷阱的状态不敏感性。鉴于锶-88的非磁性基态和低碰撞散射长度，这项工作也为在纳米光子波导上开发多功能和鲁棒的物质波原子电子电路奠定了基础。
Neutral atoms trapped in the evanescent optical potentials of nanotapered optical fibers are a promising platform for developing quantum technologies and exploring fundamental science, such as quantum networks and quantum electrodynamics. Building on the successful advancements with trapped alkali atoms, here we demonstrate a state-insensitive optical dipole trap for strontium-88, an alkaline-earth atom, using the evanescent fields of a nanotapered optical fiber. Leveraging the low laser-cooling temperatures of $\sim\!\!1~\mu$K readily achievable with strontium, we demonstrate trapping in record low trap depths corresponding to $\sim\!\!3~\mu$K. Further, employing a double magic wavelength trapping scheme, we realize state-insensitive trapping on the kilohertz-wide $5s^{2}\;^{1}\!S_{0}-5s5p\;^{3}\!P_{1,|m|=1}$ cooling transition, which we verify by performing near-surface high-resolution spectroscopy of the atomic transition. This allows us to experimentally find and verify the state insensitivity of the trap nearby a theoretically predicted magic wavelength of 435.827(25) nm. Given the non-magnetic ground state and low collisional scattering length of strontium-88, this work also lays the foundation for developing versatile and robust matter-wave atomtronic circuits over nanophotonic waveguides.