What is the nature of the technology being developed to store and contain "antimatter neutrons"?

Antimatter is extremely difficult to store and contain, because it is annihilated by any contact with normal matter. Hence, special electromagnetic containment devices have been developed over the past few decades to confine and store "antimatter protons" together in a confined vacuum space by means of the interaction between a strong electromagnetic field, and their electric charge. However, "antimatter neutrons" have no electric charge at all, hence a conventional electromagnetic field would have no effect on them. Nevertheless, I have read that technologies are being developed currently that could effectively confine and store "antimatter neutrons". Does anyone have any idea of the nature of such a technology, because, it isn't clear to me exactly what it might be, at all. Any ideas? https://en.wikipedia.org/wiki/Neutron_magnetic_moment