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arXiv 2309.03385physics.atom-phphysics.chem-phquant-ph
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在强非均匀磁场中囚禁离子激光冷却的实验实现

Experimental implementation of laser cooling of trapped ions in strongly inhomogeneous magnetic fields

Christian Mangeng, Yanning Yin, Richard Karl, Stefan Willitsch

AI总结:

本文展示了在强非均匀磁场中对分段线性 Paul 阱中囚禁的 $^{40}$Ca$^+$ 离子实现高效多普勒激光冷却,并利用塞曼效应位置依赖性绘制磁场图,为混合囚禁冷离子与中性分子实验及量子科学研究奠定基础。

摘要:

我们展示了在由两个环形永磁体产生的强四极磁场存在下,囚禁于分段线性 Paul 阱中的 $^{40}$Ca$^+$ 离子的多普勒激光冷却。800 至 1600 G/mm 的磁场梯度在囚禁离子的能级上引起了高度依赖位置的塞曼位移。使用两束具有适当波长和偏振的 397 nm 冷却激光束和一束 866 nm 重泵浦激光束,我们演示了高效的激光冷却。研究发现,离子的库仑晶体展现出与无磁场时囚禁的离子相似的长期温度。此外,塞曼效应的位置依赖性被用于生成磁场强度图。这项工作为开发由离子阱和磁阱组成、用于研究这些物种之间冷相互作用的冷离子与中性分子混合囚禁实验奠定了基础,并为采用非均匀磁场中囚禁离子的量子科学实验开辟了新可能。

英文摘要:

We demonstrate the Doppler laser cooling of $^{40}$Ca$^+$ ions confined in a segmented linear Paul trap in the presence of a strong quadrupolar magnetic field generated by two permanent ring magnets. Magnetic field gradients of 800 to 1600 G/mm give rise to a highly position-dependent Zeeman shift on the energy levels of the trapped ions. Efficient laser cooling is demonstrated using two 397 nm cooling laser beams with appropriate wavelengths and polarizations and one 866 nm repumper laser beam. Coulomb crystals of ions are found to exhibit similar secular temperatures to those trapped in absence of the magnetic field. In addition, the position dependency of the Zeeman effect is used to generate a map of the field strength. This work forms the basis for developing hybrid trapping experiments for cold ions and neutral molecules that consist of an ion and a magnetic trap to study cold interactions between these species, and opens up new possibilities for quantum-science experiments that employ trapped ions in inhomogeneous magnetic fields.

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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