A leading approach to implementing small-scale quantum computers has been to use laser beams, focused to micron spot sizes, to address and entangle trapped ions in a linear crystal. Here we propose a method to implement individually-addressed entangling gate interactions, but driven by microwave fields, with a spatial-resolution of a few microns, corresponding to 10−5 microwave wavelengths. We experimentally demonstrate the ability to suppress the effect of the state-dependent force using a single ion, and find the required interaction introduces 3.7(4)×10−4 error per emulated gate in a single-qubit benchmarking sequence. We model the scheme for a 17-qubit ion crystal, and find that any pair of ions should be addressable with an average crosstalk error of ∼10−5.
@article{arxiv.2309.02125,
title = {Individually-addressed quantum gate interactions using dynamical decoupling},
author = {M. C. Smith and A. D. Leu and M. F. Gely and D. M. Lucas},
journal= {arXiv preprint arXiv:2309.02125},
year = {2024}
}