中国物理B ›› 2023, Vol. 32 ›› Issue (12): 128501-128501.doi: 10.1088/1674-1056/acf5d0

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Single-flux-quantum-based qubit control with tunable driving strength

Kuang Liu(刘匡)1,2,3, Yifan Wang(王一凡)1,2,4, Bo Ji(季波)1,2,3, Wanpeng Gao(高万鹏)1,2,3, Zhirong Lin(林志荣)1,2,3,†, and Zhen Wang(王镇)1,2,3,4   

  1. 1 National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences(CAS), Shanghai 200050, China;
    2 CAS Center for Excellence in Superconducting Electronics, Shanghai 200050, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 ShanghaiTech University, Shanghai 201210, China
  • 收稿日期:2023-05-25 修回日期:2023-08-31 接受日期:2023-09-01 出版日期:2023-11-14 发布日期:2023-11-30
  • 通讯作者: Zhirong Lin E-mail:zrlin@mail.sim.ac.cn
  • 基金资助:
    Project supported in part by the National Natural Science Foundation of China (Grant No.92065116), the Key-Area Research and Development Program of Guangdong Province, China (Grant No.2020B0303030002), the Shanghai Technology Innovation Action Plan Integrated Circuit Technology Support Program (Grant No.22DZ1100200), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDA18000000). We thank Dr. Jie Ren, from Shanghai Institute of Microsystem and Information Technology (SIMIT), CAS, for providing SFQ design infrastructure.

Single-flux-quantum-based qubit control with tunable driving strength

Kuang Liu(刘匡)1,2,3, Yifan Wang(王一凡)1,2,4, Bo Ji(季波)1,2,3, Wanpeng Gao(高万鹏)1,2,3, Zhirong Lin(林志荣)1,2,3,†, and Zhen Wang(王镇)1,2,3,4   

  1. 1 National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences(CAS), Shanghai 200050, China;
    2 CAS Center for Excellence in Superconducting Electronics, Shanghai 200050, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 ShanghaiTech University, Shanghai 201210, China
  • Received:2023-05-25 Revised:2023-08-31 Accepted:2023-09-01 Online:2023-11-14 Published:2023-11-30
  • Contact: Zhirong Lin E-mail:zrlin@mail.sim.ac.cn
  • Supported by:
    Project supported in part by the National Natural Science Foundation of China (Grant No.92065116), the Key-Area Research and Development Program of Guangdong Province, China (Grant No.2020B0303030002), the Shanghai Technology Innovation Action Plan Integrated Circuit Technology Support Program (Grant No.22DZ1100200), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDA18000000). We thank Dr. Jie Ren, from Shanghai Institute of Microsystem and Information Technology (SIMIT), CAS, for providing SFQ design infrastructure.

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摘要： Single-flux-quantum (SFQ) circuits have great potential in building cryogenic quantum-classical interfaces for scaling up superconducting quantum processors. SFQ-based quantum gates have been designed and realized. However, current control schemes are difficult to tune the driving strength to qubits, which restricts the gate length and usually induces leakage to unwanted levels. In this study, we design the scheme and corresponding pulse generator circuit to continuously adjust the driving strength by coupling SFQ pulses with variable intervals. This scheme not only provides a way to adjust the SFQ-based gate length, but also proposes the possibility to tune the driving strength envelope. Simulations show that our scheme can suppress leakage to unwanted levels and reduce the error of SFQ-based Clifford gates by more than an order of magnitude.

关键词: superconducting qubit, qubit control, single-flux-quantum (SFQ) circuit

Abstract: Single-flux-quantum (SFQ) circuits have great potential in building cryogenic quantum-classical interfaces for scaling up superconducting quantum processors. SFQ-based quantum gates have been designed and realized. However, current control schemes are difficult to tune the driving strength to qubits, which restricts the gate length and usually induces leakage to unwanted levels. In this study, we design the scheme and corresponding pulse generator circuit to continuously adjust the driving strength by coupling SFQ pulses with variable intervals. This scheme not only provides a way to adjust the SFQ-based gate length, but also proposes the possibility to tune the driving strength envelope. Simulations show that our scheme can suppress leakage to unwanted levels and reduce the error of SFQ-based Clifford gates by more than an order of magnitude.

Key words: superconducting qubit, qubit control, single-flux-quantum (SFQ) circuit

中图分类号:  (Josephson devices)

  • 85.25.Cp
85.25.-j (Superconducting devices) 03.67.Lx (Quantum computation architectures and implementations)