Coherent errors constitute a significant barrier to successful large-scale quantum computation. One such error mechanism is crosstalk, which violates spatial locality or the independence of operations. We present a description of crosstalk and learn the underlying parameters by executing novel simultaneous Rabi experiments and fitting the Hamiltonian to the observed data. We use this model to predict three- and four-qubit experiments and observe excellent agreement between our theoretical predictions and experimental results. Our technique enables researchers to study the dynamics of multi-qubit circuits without performing experiments, potentially facilitating the minimization of coherent gate errors via digital pulse precompilation. Additionally, this method provides whole-chip crosstalk characterization, a useful tool for guiding quantum processor design.
@article{arxiv.2502.05362,
title = {First-principle crosstalk dynamics and Hamiltonian learning via Rabi experiments},
author = {Jan Balewski and Adam Winick and Yilun Xu and Neel Vora and Gang Huang and David Santiago and Joseph Emerson and Irfan Siddiqi},
journal= {arXiv preprint arXiv:2502.05362},
year = {2025}
}