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

doi:10.1088/1674-1056/ad5d98

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.

Keywords: reflection cancelation digital filter single-qubit gate superconducting circuit

Received: 28 May 2024
Revised: 25 June 2024
Accepted manuscript online: 02 July 2024

PACS:	03.67.Lx	(Quantum computation architectures and implementations)
	03.67.-a	(Quantum information)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12034018 and 11625419).

Corresponding Authors: Peng Duan, Guo-Ping Guo
E-mail: pengduan@ustc.edu.cn;gpguo@ustc.edu.cn

Cite this article:

Liang-Liang Guo(郭亮亮), Peng Duan(段鹏), Lei Du(杜磊), Hai-Feng Zhang(张海峰), Hao-Ran Tao(陶浩然), Yong Chen(陈勇), Xiao-Yan Yang(杨小燕), Chi Zhang(张驰), Zhi-Long Jia(贾志龙), Wei-Cheng Kong(孔伟成), Zhao-Yun Chen(陈昭昀), and Guo-Ping Guo(郭国平) Correction of microwave pulse reflection by digital filters in superconducting quantum circuits 2024 Chin. Phys. B 33 090303

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