Surface-electrode ion traps and technologies for scalable quantum information processing

As experiments in quantum information processing with trapped ions progress from few to many ion-qubits, it is imperative that trap designs and technologies keep pace. Surface-electrode traps offer one path to scaling experiments to large numbers of ions, but they will require the integration of many trapping zones and associated interconnects. We have developed a new trap (``Satellite'') with separated loading, storage, and computation regions connected by a newly-designed X-junction. The storage regions feature inter-digitated control electrodes, allowing storage of up to twenty ions in each zone with only a moderate increase in the trap's lead count. Even so, future traps of increasing complexity will create challenges for experimental control. With this in mind, we are developing in-vacuum electronics~\footnote{In collaboration with Honeywell International} to reduce requirements for external control systems and simplify vacuum feedthrough requirements. We have also demonstrated co-trapping of $^{40}$Ca$^{+}$ / $^{171}$Yb$^{+}$ and are exploring strategies, both theoretically and experimentally, for sympathetic cooling of dual-species ion chains.