Non-Markovian noise, arising from environmental memory effects, is the most general and challenging form of noise in quantum computing, and is typically difficult to characterize and suppress. Here, we analyze and experimentally demonstrate a non-Markovian noise suppression scheme inspired by quantum purification protocols. We theoretically prove that, even without noise calibration and assumptions on specific noise models, the scheme can exponentially reduce non-Markovian error rates with respect to the ancillary system size. We implement the protocol using nuclear spins, demonstrating that non-Markovian noise can be suppressed for both unitary operations and non-unitary channels. The observed fidelities and process tomography show close agreement with theoretical predictions, confirming the practicality and effectiveness of the scheme.
@article{arxiv.2511.20304,
title = {Realizing Universal Non-Markovian Noise Suppression},
author = {Hongfeng Liu and Zizhao Han and Xinfang Nie and Zhenhuan Liu and Dawei Lu},
journal= {arXiv preprint arXiv:2511.20304},
year = {2025}
}