  Surface ion traps with two-dimensional layouts of trapping regions are
natural architectures for storing large numbers of ions and supporting the
connectivity needed to implement quantum algorithms. Many of the components and
operations needed to fully exploit this architecture have already been
demonstrated, including operation at cryogenic temperatures with low heating,
low excitation transport, and ion control and detection with integrated
photonics. Here we demonstrate a trap that addresses the scaling challenge of
increasing power dissipation as the RF electrode increases in size. By raising
the RF electrode and removing most of the insulating dielectric layer below it
we reduce both ohmic and dielectric power dissipation. We also measure heating
rates across a range of motional frequencies and for different voltage sources
in a trap with a raised RF electrode but solid dielectric.
