Design of a gap tunable flux qubit with FastHenry
Akhtar Naheed, Zheng Yarui, Nazir Mudassar, Wu Yulin, Deng Hui, Zheng Dongning†, , Zhu Xiaobo‡,
       

Circuit layout for inductance extraction. Red crosses denote Josephson junctions. (a) A gap-tunable flux qubit with readout and control circuits (qubit a) and (b) a flux qubit inductively coupled to a resonator (qubit b).