Progress on the 40Ca + ion optical clock
Baolin Zhang(张宝林), Yao Huang(黄垚), Huaqing Zhang(张华青), Yanmei Hao(郝艳梅), Mengyan Zeng(曾孟彦), Hua Guan(管桦), Kelin Gao(高克林)
Chin. Phys. B . 2020, (7): 74209 -074209 .  DOI: 10.1088/1674-1056/ab9432