Scaling quantum information processors is a challenging task, requiring manipulation of a large number of qubits with high fidelity and a high degree of connectivity. For trapped ions, this could be realized in a two-dimensional array of interconnected traps in which ions are separated, transported and recombined to carry out quantum operations on small subsets of ions. Here, we use a junction connecting orthogonal linear segments in a two-dimensional (2D) trap array to reorder a two-ion crystal. The secular motion of the ions experiences low energy gain and the internal qubit levels maintain coherence during the reordering process, therefore demonstrating a promising method for providing all-to-all connectivity in a large-scale, two- or three-dimensional trapped-ion quantum information processor.
@article{arxiv.2003.03520,
title = {Ion transport and reordering in a two-dimensional trap array},
author = {Y. Wan and R. Jördens and S. D. Erickson and J. J. Wu and R. Bowler and T. R. Tan and P. -Y. Hou and D. J. Wineland and A. C. Wilson and D. Leibfried},
journal= {arXiv preprint arXiv:2003.03520},
year = {2021}
}