  Quantum computers are rapidly becoming more capable, with dramatic increases
in both qubit count and quality. Among different hardware approaches,
trapped-ion quantum processors are a leading technology for quantum computing,
with established high-fidelity operations and architectures with promising
scaling. Here, we demonstrate and thoroughly benchmark the IonQ Forte system:
configured here as a single-chain 30-qubit trapped-ion quantum computer with
all-to-all operations. We assess the performance of our quantum computer
operation at the component level via direct randomized benchmarking (DRB)
across all 30 choose 2 = 435 gate pairs. We then show the results of
application-oriented benchmarks, indicating that the system passes the suite of
algorithmic qubit (AQ) benchmarks up to #AQ 29. Finally, we use our
component-level benchmarking to build a system-level model to predict the
application benchmarking data through direct simulation, including error
mitigation. We find that the system-level model correlates well with the
observations in many cases, though in some cases out-of-model errors lead to
higher predicted performance than is observed. This highlights that as quantum
computers move toward larger and higher-quality devices, characterization
becomes more challenging, suggesting future work required to push performance
further.
