Electronic systems for qubit control and measurement serve as a bridge between quantum programming language and quantum information processors. With the rapid development of superconducting quantum circuit (SQC) technology, synchronization in a large-scale system, low-latency execution, and low noise are required for electronic systems. Here, we present a field-programmable gate array (FPGA)-based electronic system with a distributed synchronous clock and trigger architecture. The system supports synchronous control of qubits with jitters of approximately 5 ps. We implement a real-time digital signal processing system in the FPGA, enabling precise timing control, arbitrary waveform generation, IQ demodulation for qubit state discrimination, and the generation of real-time qubit-state-dependent trigger signals for feedback/feedforward control. The hardware and firmware low-latency design reduces the feedback/feedforward latency of the electronic system to 125 ns, significantly less than the decoherence times of the qubit. Finally, we demonstrate the functionalities and low-noise performance of this system using a fluxonium quantum processor.
@article{arxiv.2110.07965,
title = {FPGA-based electronic system for the control and readout of superconducting quantum processors},
author = {Yuchen Yang and Zhongtao Shen and Xing Zhu and Ziqi Wang and Gengyan Zhang and Jingwei Zhou and Xun Jiang and Chunqing Deng and Shubin Liu},
journal= {arXiv preprint arXiv:2110.07965},
year = {2022}
}