Evaluation of the systematic shifts of a $${}^{40}\text {Ca}^{+}$$–$${}^{27}\text {Al}^{+}$$ optical clock

Kaifeng Cui, Sijia Chao, Chenglong Sun, Shaomao Wang, Ping Zhang, Yuan-Fei Wei, Jinbo Yuan, Jian Cao, Hualin Shu, Xue-Ren Huang