Generating two-dimensional quantum gases with high stability  

作　　者：Bo Xiao Xuan-Kai Wang Yong-Guang Zheng Yu-Meng Yang Wei-Yong Zhang Guo-Xian Su Meng-Da Li Xiao Jiang Zhen-Sheng Yuan 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(Hefei National Laboratory for Physical Sciences at the Microscale,and Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,Hefei 230026,China)

机构地区：[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

出　　处：《Chinese Physics B》2020年第7期413-420,共8页中国物理B（英文版）

基　　金：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：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 

分 类 号：O413.3[理学—理论物理]