Compensating for excess micromotion of ion crystals*
Du Li-Juna),b),c), Chen Tinga),b),c), Song Hong-Fanga),b),c), Chen Shao-Longa),b),c), Li Hai-Xiaa),b),c), Huang Yaoa),b), Tong Xina),b), Gao Ke-Lina),b), Guan Hua†a),b)
       
Images of the cleaning process of the impurity ingredients. (a) Heavier ions are located in the outer regions of the 40Ca+ crystal because of the mass dependence of the radial trapping potential. (b) Heavier ions are removed from the trap by applying an additional voltage to A 2, A 4, B 2, B 4, and C 2, C 4. (c) A single-component crystal of the 40Ca+ ions is obtained after the cleaning process.