Encoding logical qubits in bosonic modes provides a potentially hardware-efficient implementation of fault-tolerant quantum information processing. Here, we demonstrate high-fidelity and deterministic preparation of highly non-classical bosonic states in the mechanical motion of a trapped ion. Our approach implements error-suppressing pulses through optimized dynamical modulation of laser-driven spin-motion interactions to generate the target state in a single step. We demonstrate logical fidelities for the Gottesman-Kitaev-Preskill (GKP) state as high as Fˉ=0.940(8), a distance-3 binomial state with an average fidelity of F=0.807(7), and a 12.91(5) dB squeezed vacuum state.
@article{arxiv.2310.15546,
title = {Robust and Deterministic Preparation of Bosonic Logical States in a Trapped Ion},
author = {V. G. Matsos and C. H. Valahu and T. Navickas and A. D. Rao and M. J. Millican and X. C. Kolesnikow and M. J. Biercuk and T. R. Tan},
journal= {arXiv preprint arXiv:2310.15546},
year = {2024}
}