中国物理B ›› 2024, Vol. 33 ›› Issue (9): 90303-090303.doi: 10.1088/1674-1056/ad5d98

所属专题： SPECIAL TOPIC — Quantum computing and quantum sensing

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Correction of microwave pulse reflection by digital filters in superconducting quantum circuits

Liang-Liang Guo(郭亮亮)1,2, Peng Duan(段鹏)1,2,†, Lei Du(杜磊)1,2, Hai-Feng Zhang(张海峰)1,2, Hao-Ran Tao(陶浩然)1,2, Yong Chen(陈勇)1,2, Xiao-Yan Yang(杨小燕)1,2, Chi Zhang(张驰)3, Zhi-Long Jia(贾志龙)3, Wei-Cheng Kong(孔伟成)3, Zhao-Yun Chen(陈昭昀)4, and Guo-Ping Guo(郭国平)1,2,3,‡   

  1. 1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
    2 CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
    3 Origin Quantum Computing Company Limited, Hefei 230088, China;
    4 Institute of Artificial Intelligence, Hefei Comprehensive National Science Center, Hefei 230088, China
  • 收稿日期:2024-05-28 修回日期:2024-06-25 接受日期:2024-07-02 发布日期:2024-08-15
  • 通讯作者: Peng Duan, Guo-Ping Guo E-mail:pengduan@ustc.edu.cn;gpguo@ustc.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12034018 and 11625419).

Correction of microwave pulse reflection by digital filters in superconducting quantum circuits

Liang-Liang Guo(郭亮亮)1,2, Peng Duan(段鹏)1,2,†, Lei Du(杜磊)1,2, Hai-Feng Zhang(张海峰)1,2, Hao-Ran Tao(陶浩然)1,2, Yong Chen(陈勇)1,2, Xiao-Yan Yang(杨小燕)1,2, Chi Zhang(张驰)3, Zhi-Long Jia(贾志龙)3, Wei-Cheng Kong(孔伟成)3, Zhao-Yun Chen(陈昭昀)4, and Guo-Ping Guo(郭国平)1,2,3,‡   

  1. 1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
    2 CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
    3 Origin Quantum Computing Company Limited, Hefei 230088, China;
    4 Institute of Artificial Intelligence, Hefei Comprehensive National Science Center, Hefei 230088, China
  • Received:2024-05-28 Revised:2024-06-25 Accepted:2024-07-02 Published:2024-08-15
  • Contact: Peng Duan, Guo-Ping Guo E-mail:pengduan@ustc.edu.cn;gpguo@ustc.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12034018 and 11625419).

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摘要： Reducing the control error is vital for high-fidelity digital and analog quantum operations. In superconducting circuits, one disagreeable error arises from the reflection of microwave signals due to impedance mismatch in the control chain. Here, we demonstrate a reflection cancelation method when considering that there are two reflection nodes on the control line. We propose to generate the pre-distortion pulse by passing the envelopes of the microwave signal through digital filters, which enables real-time reflection correction when integrated into the field-programmable gate array (FPGA). We achieve a reduction of single-qubit gate infidelity from 0.67% to 0.11% after eliminating microwave reflection. Real-time correction of microwave reflection paves the way for precise control and manipulation of the qubit state and would ultimately enhance the performance of algorithms and simulations executed on quantum processors.

关键词: reflection cancelation, digital filter, single-qubit gate, superconducting circuit

Abstract: Reducing the control error is vital for high-fidelity digital and analog quantum operations. In superconducting circuits, one disagreeable error arises from the reflection of microwave signals due to impedance mismatch in the control chain. Here, we demonstrate a reflection cancelation method when considering that there are two reflection nodes on the control line. We propose to generate the pre-distortion pulse by passing the envelopes of the microwave signal through digital filters, which enables real-time reflection correction when integrated into the field-programmable gate array (FPGA). We achieve a reduction of single-qubit gate infidelity from 0.67% to 0.11% after eliminating microwave reflection. Real-time correction of microwave reflection paves the way for precise control and manipulation of the qubit state and would ultimately enhance the performance of algorithms and simulations executed on quantum processors.

Key words: reflection cancelation, digital filter, single-qubit gate, superconducting circuit

中图分类号:  (Quantum computation architectures and implementations)

  • 03.67.Lx
03.67.-a (Quantum information)