Preparation of a two-state mixture of ultracold fermionic atoms with balanced population subject to the unstable magnetic field  

作　　者：Donghao Li Lianghui Huang Guoqi Bian Jie Miao Liangchao Chen Zengming Meng Wei Han Pengjun Wang 李东豪;黄良辉;边国旗;苗杰;陈良超;孟增明;韩伟;王鹏军(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-electronics,Shanxi University,Taiyuan 030006,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Chinese Physics B》2021年第9期107-110,共4页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant Nos.2016YFA0301602 and 2018YFA0307601);the National Natural Science Foundation of China(Grant Nos.12034011,92065108,11704234,11804203,11974224,12022406,and 12004229);the Fund for Shanxi“1331 Project”Key Subjects Construction.

摘　　要：We report a novel method to prepare a mixture of ^(40)K Fermi gas having an equal population of the two ground magnetic spin states confined in an optical dipole trap,in the presence of an noisy quantization(magnetic)field.We realize the equal population mixture by applying a series of RF pulses.We observe the dependence of the population distribution between two spin states on the number of the applied RF pulses and find that the decoherence effects leading to the population fluctuations are overcome by the high number of RF pules.Our demonstrated technique can be potentially used in the precision measurement experiments with ultracold gases in noisy environments.

关 键 词：Fermi gas balanced mixture RF-pulses precision measurement 

分 类 号：O572[理学—粒子物理与原子核物理] O469[理学—物理]