Scalable Techniques with Trapped Ion Quantum Information Processing*

We report progress towards combining all the building blocks required for scalable quantum information processing using trapped atomic ions. Included elements are qubits with long coherence times, a laser-induced universal gate, motional state initialization using a second ion species, and information transport. Our techniques include the use of a multiple electrode segmented trap, wherein information transport is achieved through the transport of ions between spatially distinct locations. While experiment timescales had previously been dominated by ion transport and re-initialization of motional states, we have achieved diabatic transport of ions on timescales comparable to quantum logic with low motional excitations [1]. We have also achieved rapid sympathetic ground state cooling with use of an electromagnetically-induced transparency cooling scheme [2]. In addition, we have demonstrated a method to efficiently measure gate fidelity in a scalable way involving multiple qubits and randomized benchmarking [3]. [1] R. Bowler \textit{et. al.} Phys. Rev. Lett. \textbf{109}, 080502 (2012) [2] Y. Lin \textit{et. al. }arXiv:1211.6647 [3] J. P. Gaebler \textit{et. al.} Phys. Rev. Lett. \textbf{108}, 260503 (2012)