Superconducting qubits have emerged as a premier platform for large-scale quantum computation, yet the fidelity of state readout is often hindered by random noise and crosstalk, especially in multi-qubit systems. While neural networks trained on labeled data have shown promise in reducing crosstalk effects during readout, their current capabilities are limited to binary discrimination of joint-qubit states due to architectural constraints. Here we introduce a time-resolved modulated neural network capable of full-state tomography for individual qubits, enabling detailed time-resolved measurements like Rabi oscillations. This scalable approach, with a dedicated module per qubit, mitigated readout error by an order of magnitude under low signal-to-noise ratios and substantially reduced variance in Rabi oscillation measurements. This advancement bolsters quantum state discrimination with neural networks, and propels the development of next-generation quantum processors with enhanced performance and scalability.
@article{arxiv.2312.07958,
title = {Neural network based time-resolved state tomography of superconducting qubits},
author = {Ziyang You and Jiheng Duan and Wenhui Huang and Libo Zhang and Song Liu and Youpeng Zhong and Hou Ian},
journal= {arXiv preprint arXiv:2312.07958},
year = {2024}
}