Xiao Geng1,2* Kaiyong He1,2 Rutian Huang1,2 Jianshe Liu1,2 Wei Chen1,2,3 1Laboratory of Superconducting Quantum Information Processing, School of Integrated Circuits, Tsinghua University, Beijing, China 2Beijing National Research Center for Information Science and Technology, Beijing, China 3Beijing Innovation Center for Future Chips, Tsinghua University, Beijing, China A device called the qubit energy tuner (QET), based on single flux quantum (SFQ) circuits, has been proposed for Z control...