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In the endeavour to scale up the number of qubits in an ion-based quantumcomputer several groups have started to develop miniaturized ion traps forextended spatial control and manipulation of the ions. Shuttling and separationof ion strings have been the foremost issues in linear-trap arrangements andsome prototypes of junctions have been demonstrated for the extension of ionmotion to two dimensions (2D). While junctions require complex trap structures,small extensions to the 1D motion can be accomplished in simple linear traparrangements. Here, control of the extended field in a planar, linear chip trapis used to shuttle ions in 2D. With this approach, the order of ions in astring is deterministically reversed. Optimized potentials are theoreticallyderived and simulations show that the reordering can be carried outadiabatically. The control over individual ion positions in a linear trappresents a new tool for ion-trap quantum computing. The method is also expectedto work with mixed crystals of different ion species and as such could haveapplications for sympathetic cooling of an ion string.

Deterministic reordering of 40Ca+ ions in a linear segmented Paul trap