Cavity-induced ATS effect on a superconducting Xmon qubit<xref rid="cpb_27_8_084202fn1" ref-type="fn">*</xref><fn id="cpb_27_8_084202fn1"><label>*</label><p>Project supported by the Science Funds from the Ministry of Science and Technology of China (Grant Nos. 2014CB921401, 2017YFA0304300, 2014CB921202, and 2016YFA0300601), the National Natural Science Foundation of China (Grant No. 11674376), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07010300).</p></fn>

Cavity-induced ATS effect on a superconducting Xmon qubit**

Project supported by the Science Funds from the Ministry of Science and Technology of China (Grant Nos. 2014CB921401, 2017YFA0304300, 2014CB921202, and 2016YFA0300601), the National Natural Science Foundation of China (Grant No. 11674376), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07010300).

Guo Xueyi^{1, 2}, Deng Hui¹, Ding Jianghao³, Li Hekang^{1, 2}, Song Pengtao^{1, 2}, Wang Zhan^{1, 2}, Su Luhong^{1, 2}, Liu Yanjun¹, Xiang Zhongcheng¹, Li Jie¹, Jin Yirong¹, Liu Yuxi^{3, 4}, Zheng Dongning^{1, 2, †}

(color online) The energy level diagram of the coupled system. The lowest three levels of Xmon are labeled with |g〉, |e〉, and |f〉, and the Fock state of the cavity is labeled with |n〉, n ∈ [0,1,2,…]. The red transition corresponds to the state of zero photon in the resonator. The two blue transitions correspond to the state of one photon in the cavity, which is split by the resonance coupling between the resonator and two upper levels of the Xmon. This splitting is also known as degeneracy splitting of energy levels.