Qubit energy tuner based on single flux quantum circuits

Frontiers in Physics

Physics

Xiao Geng¹  Jianshe Liu¹  Kaiyong He¹  Rutian Huang¹  Wei Chen² 

[1] Laboratory of Superconducting Quantum Information Processing, School of Integrated Circuits, Tsinghua University, Beijing, China;Beijing National Research Center for Information Science and Technology, Beijing, China;Laboratory of Superconducting Quantum Information Processing, School of Integrated Circuits, Tsinghua University, Beijing, China;Beijing National Research Center for Information Science and Technology, Beijing, China;Beijing Innovation Center for Future Chips, Tsinghua University, Beijing, China;

关键词: qubit;    quantum control;    superconducting quantum computing;    RSFQ;    superconducting electronics;   

DOI  :  10.3389/fphy.2023.1215468

 received in 2023-05-02, accepted in 2023-07-17,  发布年份 2023

来源: Frontiers

【 摘 要 】

A device called the qubit energy tuner (QET), based on single flux quantum (SFQ) circuits, has been proposed for Z control of superconducting qubits. The QET is created by improving flux digital-to-analog converters (flux DACs). It can set the energy levels or frequencies of qubits, particularly flux-tunable transmons, and perform gate operations requiring Z control. The circuit structure of the QET is elucidated, consisting of an inductor loop and flux bias units for coarse or fine-tuning. The key feature of the QET is analyzed to understand how SFQ pulses change the inductor loop current, which provides external flux for qubits. Three simulations were performed to verify QET functionality. The first simulation verified the responses of the inductor loop current to SFQ pulses, showing a relative deviation of approximately 4.259% between the analytical solutions of the inductor loop current and the solutions from the WRSpice time-domain simulation. The second and third simulations, using QuTip, demonstrated how to perform a Z gate and an iSWAP gate using the QET, respectively, with corresponding fidelities of 99.99884% and 99.93906% for only one gate operation to specific initial states. These simulations indicate that the SFQ-based QET could act as an efficient component of SFQ-based quantum–classical interfaces for digital Z control of large-scale superconducting quantum computers.

【 授权许可】

Unknown   
Copyright © 2023 Geng, He, Huang, Liu and Chen.