%A He-Kang Li(李贺康), Ke-Min Li(李科敏), Hang Dong(董航), Qiu-Jiang Guo(郭秋江), Wu-Xin Liu(刘武新), Zhan Wang(王战), Hao-Hua Wang(王浩华), Dong-Ning Zheng(郑东宁) %T Tunable coupling between Xmon qubit and coplanar waveguide resonator %0 Journal Article %D 2019 %J Chin. Phys. B %R 10.1088/1674-1056/28/8/080305 %P 80305-080305 %V 28 %N 8 %U {https://cpb.iphy.ac.cn/CN/abstract/article_121786.shtml} %8 2019-08-05 %X

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 μs in the presence of the coupling element.