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) (a) Optical micrograph of the sample. The red part is the Xmon qubit in which a DC-SQUID, shown in the inset, functions as a nonlinear inductor. The Z control line is inductively coupled to the DC-SQUID, and can be used to adjust the energy level of the Xmon. The green part is a λ/4 coplanar waveguide resonator, which can be driven by the microwave field applied through the microwave line. The resonator and the Xmon are capacitively coupled to each other. The Xmon is also coupled to the transmission line. (b) Schematic diagram of the experimental setup. The sample is packaged inside an aluminum alloy sample box that is mounted on the mixing chamber stage of a dilution refrigerator. The green line is used for applying a microwave field to drive the λ/4 coplanar waveguide resonator. The red line is used for adjusting the energy level of the Xmon. The black line is connected to the transmission line used for detection of the probe signal. Ports 1 and 2 are connected to a vector network analyzer.