Generating two-dimensional quantum gases with high stability

doi:10.1088/1674-1056/ab8ac8

中国物理B ›› 2020, Vol. 29 ›› Issue (7): 76701-076701.doi: 10.1088/1674-1056/ab8ac8

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Generating two-dimensional quantum gases with high stability

1 Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;
2 CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China

收稿日期:2020-02-14 修回日期:2020-04-13 出版日期:2020-07-05 发布日期:2020-07-05
通讯作者: Zhen-Sheng Yuan E-mail:yuanzs@ustc.edu.cn
基金资助:
Project supported by the National Key R&D Program of China (Grant No. 2016YFA0301603), the National Natural Science Foundation of China (Grant No. 11874341), Anhui Initiative in Quantum Information Technologies, and Chinese Academy of Sciences.

Generating two-dimensional quantum gases with high stability

Bo Xiao(肖波)^1,2, Xuan-Kai Wang(王宣恺)^1,2, Yong-Guang Zheng(郑永光)^1,2, Yu-Meng Yang(杨雨萌)^1,2, Wei-Yong Zhang(章维勇)^1,2, Guo-Xian Su(苏国贤)^1,2, Meng-Da Li(李梦达)^1,2, Xiao Jiang(江晓)^1,2, Zhen-Sheng Yuan(苑震生)^1,2

1 Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;
2 CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China

Received:2020-02-14 Revised:2020-04-13 Online:2020-07-05 Published:2020-07-05
Contact: Zhen-Sheng Yuan E-mail:yuanzs@ustc.edu.cn
Supported by:
Project supported by the National Key R&D Program of China (Grant No. 2016YFA0301603), the National Natural Science Foundation of China (Grant No. 11874341), Anhui Initiative in Quantum Information Technologies, and Chinese Academy of Sciences.

摘要/Abstract

摘要： Quantum gas microscopy has enabled the study on intriguing properties of ultracold atoms in optical lattices. It provides the cutting-edge technology for manipulating quantum many-body systems. In such experiments, atoms have to be prepared into a two-dimensional (2D) system for being resolved by microscopes with limited depth of focus. Here we report an experiment on slicing a single layer of the atoms trapped in a few layers of pancake-shaped optical traps to create a 2D system. This technique is implemented with a microwave “knife”, i.e., a microwave field with a frequency defined by the resonant condition with the Zeeman-shifted atomic levels related to a gradient magnetic field. It is crucial to keep a stable preparation of the desired layer to create the 2D quantum gas for future experimental applications. To achieve this, the most important point is to provide a gradient magnetic field with low noises and slow drift in combination with a properly optimized microwave pulse. Monitoring the electric current source and the environmental magnetic field, we applied an actively stabilizing circuit and realized a field drift of 0.042(3) mG/hour. This guarantees creating the single layer of atoms with an efficiency of 99.92(3)% while atoms are hardly seen in other layers within 48 hours, satisfying future experimental demands on studying quantum many-body physics.

关键词: ultracold atoms, optical lattices, two-dimensional quantum gases, quantum-gas microscope

Abstract: Quantum gas microscopy has enabled the study on intriguing properties of ultracold atoms in optical lattices. It provides the cutting-edge technology for manipulating quantum many-body systems. In such experiments, atoms have to be prepared into a two-dimensional (2D) system for being resolved by microscopes with limited depth of focus. Here we report an experiment on slicing a single layer of the atoms trapped in a few layers of pancake-shaped optical traps to create a 2D system. This technique is implemented with a microwave “knife”, i.e., a microwave field with a frequency defined by the resonant condition with the Zeeman-shifted atomic levels related to a gradient magnetic field. It is crucial to keep a stable preparation of the desired layer to create the 2D quantum gas for future experimental applications. To achieve this, the most important point is to provide a gradient magnetic field with low noises and slow drift in combination with a properly optimized microwave pulse. Monitoring the electric current source and the environmental magnetic field, we applied an actively stabilizing circuit and realized a field drift of 0.042(3) mG/hour. This guarantees creating the single layer of atoms with an efficiency of 99.92(3)% while atoms are hardly seen in other layers within 48 hours, satisfying future experimental demands on studying quantum many-body physics.

Key words: ultracold atoms, optical lattices, two-dimensional quantum gases, quantum-gas microscope

中图分类号: (Ultracold gases, trapped gases)

67.85.-d

05.30.-d (Quantum statistical mechanics) 37.10.Jk (Atoms in optical lattices)

肖波, 王宣恺, 郑永光, 杨雨萌, 章维勇, 苏国贤, 李梦达, 江晓, 苑震生. Generating two-dimensional quantum gases with high stability[J]. 中国物理B, 2020, 29(7): 76701-076701.

Bo Xiao(肖波), Xuan-Kai Wang(王宣恺), Yong-Guang Zheng(郑永光), Yu-Meng Yang(杨雨萌), Wei-Yong Zhang(章维勇), Guo-Xian Su(苏国贤), Meng-Da Li(李梦达), Xiao Jiang(江晓), Zhen-Sheng Yuan(苑震生). Generating two-dimensional quantum gases with high stability[J]. Chin. Phys. B, 2020, 29(7): 76701-076701.

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Generating two-dimensional quantum gases with high stability

Generating two-dimensional quantum gases with high stability

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