Tunable coupling between Xmon qubit and coplanar waveguide resonator*
Hekang Li, Ke-Min Li, Hang Dong, Qiujiang Guo, Wuxin Liu, Zhan Wang, Haohua Wang, Dongning Zheng · Chinese Physics B · 2019
Realization of a flexible and tunable coupling scheme among qubits is critical for scalable quantum information processing. Here, we design and characterize a tunable coupling element based on Josephson junction, which can be adapted to an all-to-all connected circuit architecture where multiple Xmon qubits couple to a common coplanar waveguide resonator. The coupling strength is experimentally verified to be adjustable from 0 MHz to about 40 MHz, and the qubit lifetime can still be up to 12 μ s in the presence of the coupling element.