Compact dual MOT apparatus of K and Rb for optical tweezer experiment

doi:10.1088/1674-1056/ade8e2

中国物理B ›› 2026, Vol. 35 ›› Issue (1): 13701-013701.doi: 10.1088/1674-1056/ade8e2

Compact dual MOT apparatus of K and Rb for optical tweezer experiment

Kedi Wei(魏可迪), Yangbo Wei(韦样波), Shangjin Li(李上进), and Bo Yan(颜波)†

School of Physics, Zhejiang University, Hangzhou 310027, China

收稿日期:2025-05-04 修回日期:2025-06-21 接受日期:2025-06-27 发布日期:2026-01-14
通讯作者: Bo Yan E-mail:yanbohang@zju.edu.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2023YFA1406703 and 2022YFA1404203), the National Natural Science Foundation of China (Grant Nos. 12425408, U21A20437 and 12074337), the Natural Science Foundation of Zhejiang Province, China (Grant No. LR21A040002), and the Fundamental Research Funds for the Central Universities (Grant No. 226-2023-00131).

Compact dual MOT apparatus of K and Rb for optical tweezer experiment

Kedi Wei(魏可迪), Yangbo Wei(韦样波), Shangjin Li(李上进), and Bo Yan(颜波)†

School of Physics, Zhejiang University, Hangzhou 310027, China

Received:2025-05-04 Revised:2025-06-21 Accepted:2025-06-27 Published:2026-01-14
Contact: Bo Yan E-mail:yanbohang@zju.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2023YFA1406703 and 2022YFA1404203), the National Natural Science Foundation of China (Grant Nos. 12425408, U21A20437 and 12074337), the Natural Science Foundation of Zhejiang Province, China (Grant No. LR21A040002), and the Fundamental Research Funds for the Central Universities (Grant No. 226-2023-00131).

摘要/Abstract

摘要： The optical tweezer experiment with neutral atoms is widely used for quantum information research. Here, we present a compact dual magneto-optical trap (MOT) setup for a two-species optical tweezer. Rubidium (Rb) atoms are directly captured using a vapor MOT, while potassium (K) atoms are collected via a 2-stage MOT. Both the quadratic and gradient magnetic fields required for the MOT and Zeeman slower are created by permanent magnets. With the help of the Zeeman slower, the K MOT loading efficiency is enhanced by a factor of three. After the MOT stage, we apply D$_1$ gray molasses to reduce the temperature of the K atoms to 9 μK. Using this apparatus, both Rb and K are loaded into the optical tweezer.

关键词: atom, molecule, ion cooling methods, atom cooling methods

Abstract: The optical tweezer experiment with neutral atoms is widely used for quantum information research. Here, we present a compact dual magneto-optical trap (MOT) setup for a two-species optical tweezer. Rubidium (Rb) atoms are directly captured using a vapor MOT, while potassium (K) atoms are collected via a 2-stage MOT. Both the quadratic and gradient magnetic fields required for the MOT and Zeeman slower are created by permanent magnets. With the help of the Zeeman slower, the K MOT loading efficiency is enhanced by a factor of three. After the MOT stage, we apply D$_1$ gray molasses to reduce the temperature of the K atoms to 9 μK. Using this apparatus, both Rb and K are loaded into the optical tweezer.

Key words: atom, molecule, ion cooling methods, atom cooling methods

中图分类号: (Atom, molecule, and ion cooling methods)

37.10.-x

37.10.De (Atom cooling methods)

Kedi Wei(魏可迪), Yangbo Wei(韦样波), Shangjin Li(李上进), and Bo Yan(颜波). Compact dual MOT apparatus of K and Rb for optical tweezer experiment[J]. 中国物理B, 2026, 35(1): 13701-013701.

Kedi Wei(魏可迪), Yangbo Wei(韦样波), Shangjin Li(李上进), and Bo Yan(颜波). Compact dual MOT apparatus of K and Rb for optical tweezer experiment[J]. Chin. Phys. B, 2026, 35(1): 13701-013701.

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Compact dual MOT apparatus of K and Rb for optical tweezer experiment

Compact dual MOT apparatus of K and Rb for optical tweezer experiment

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