Slow growth of quantum magic in disorder-free Stark many-body localization
Abstract
Disorder-free quantum many-body localization can strongly suppress transport while still enabling the dynamical buildup of computationally costly non-Clifford resources. In a tilted transverse-field Ising chain realizing disorder-free Stark many-body localization, we use the stabilizer R\'enyi entropy to quantify quantum magic (nonstabilizerness) and find that it remains finite and grows anomalously slowly over extended time windows before saturating to a size-dependent plateau deep in the strong-tilt regime, with pronounced initial-state selectivity. Upon increasing the Stark gradient, the long-time magic and half-chain entanglement exhibit consistent finite-size crossing behavior, indicating a crossover from ergodic dynamics to constrained localization. These results establish stabilizer-based magic as a practical complexity diagnostic of disorder-free ergodicity breaking and constrained dynamics, and provide an experimentally accessible route to benchmarking and designing near-term quantum simulators.
Keywords
Cite
@article{arxiv.2512.16859,
title = {Slow growth of quantum magic in disorder-free Stark many-body localization},
author = {Han-Ze Li and Yi-Rui Zhang and Yu-Jun Zhao and Xuyang Huang and Jian-Xin Zhong},
journal= {arXiv preprint arXiv:2512.16859},
year = {2026}
}