Demonstration of the QCCD trapped-ion quantum computer architecture.

We report on the integration of all necessary ingredients of the trapped-ion QCCD (quantum charge-coupled device) architecture into a robust, fully-connected, and programmable trapped-ion quantum computer. The system employs $^{171}$Yb$^+$ ions for qubits and $^{138}$Ba$^+$ ions for sympathetic cooling and is built around a Honeywell cryogenic surface trap capable of arbitrary ion rearrangement and parallel gate operations across multiple zones. As a minimal demonstration, we use two spatially-separated interaction zones in parallel to execute arbitrary four-qubit quantum circuits. The architecture is benchmarked at both the component level and at the holistic level through a variety of means. Individual components including state preparation and measurement, single-qubit gates, and two-qubit gates are characterized with randomized benchmarking. Holistic tests include parallelized randomized benchmarking showing that the cross-talk between different gate regions is negligible, a teleported CNOT gate utilizing mid-circuit measurement, and a quantum volume measurement of $2^4$.