Compact 780-nm Rb optical clockRemoveZhendong Chen, Tianyu Liu, Ruoao Yang, Qiaohui Yang, Ya Wang, Jie Miao, Jingming Chen, Duo Pan, Shiying Cao, Zhigang Zhang, Jianjun Wu, and Jingbiao ChenPhys. Rev. Applied 25, 014004 (2026)