Dance of Ions: How Quantum Vortices Are Born express
In a field trap, scientists assembled a crystal — 150 ions at ultra-low temperature. Each ion behaves like a tiny magnet, capable of rotating in any direction. By controlling forces that depend on this rotation, physicists made all the magnets swirl into a common vortex called a skyrmion. This whirl, resembling a miniature galactic arm, has a spiral structure.
To see the pattern, the ions were illuminated with a laser — a spectroscopy method. If a particle glowed, its orientation was known. The reconstructed vortex turned out to be almost perfect: the winding number is 0.99 (for an ideal vortex it's 1.0). The accuracy of the spin pattern reproduction is 87%.
Scientists also created domain walls — boundaries between differently magnetized regions. The platform opens the way to studying systems where particles influence each other at a distance.
Original abstract
as written by the authors arXiv:2604.13872
Quantum simulation with controllable many-body platforms offers a powerful route to exploring complex phases and dynamics that are difficult to access in natural materials. Among these, topological spin textures such as skyrmions are central to modern condensed-matter physics and play a key role in chiral quantum many-body systems. Their controlled realisation in large, programmable quantum platforms, however, remains an outstanding challenge. Here, we report deterministic generation and site-resolved reconstruction of topological spin textures in a two-dimensional crystal of more than 150 trapped ions. Using globally applied spin-dependent forces, we generate skyrmion configurations and reconstruct the full vector spin field with single-ion resolution, obtaining a winding number of 0.99$$\pm$$0.02 and a mean local fidelity of 0.87$$\pm$$0.04. In addition, we implement single-ion-resolved control to deterministically prepare domain-wall states, extending our approach to a broader class of non-uniform spin textures. These results establish trapped-ion crystals as a platform for engineering complex spin textures and open the door to exploring topology-dependent nonequilibrium dynamics in long-range interacting quantum systems.
The name 'skyrmion' comes from British physicist Tony Skyrme, who proposed these vortices as a model for nuclear forces in the 1960s.