Inevitable interactions with the reservoir largely degrade the performance of non-local gates, which hinders practical quantum computation from coming into existence. Here we experimentally demonstrate a 99.920(7)\%-fidelity controlled-NOT gate by suppressing the complicated noise in a solid-state spin system at room temperature. We found that the fidelity limited at 99\% in previous works results from only considering static noise, and thus, in this work, time-dependent noise and quantum noise are also included. All noises are dynamically corrected by an exquisitely designed shaped pulse, giving the resulting error below 10−4. The residual gate error is mainly originated from the longitudinal relaxation and the waveform distortion that can both be further reduced technically. Our noise-resistant method is universal, and will benefit other solid-state spin systems.
@article{arxiv.2212.02831,
title = {99.92%-Fidelity CNOT Gates in Solids by Filtering Time-dependent and Quantum Noises},
author = {Tianyu Xie and Zhiyuan Zhao and Shaoyi Xu and Xi Kong and Zhiping Yang and Mengqi Wang and Ya Wang and Fazhan Shi and Jiangfeng Du},
journal= {arXiv preprint arXiv:2212.02831},
year = {2022}
}