Author:
Guo 郭 Liang-Liang 亮亮,Duan 段 Peng 鹏,Du 杜 Lei 磊,Zhang 张 Hai-Feng 海峰,Tao 陶 Hao-Ran 浩然,Chen 陈 Yong 勇,Yang 杨 Xiao-Yan 小燕,Zhang 张 Chi 驰,Jia 贾 Zhi-Long 志龙,Kong 孔 Wei-Cheng 伟成,Chen 陈 Zhao-Yun 昭昀,Guo 郭 Guo-Ping 国平
Abstract
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.