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Research dossier · version 1 · updated Oct 30, 2026

Neutral-Atom & Trapped-Ion Quantum Computing: State of the Field (October 2026)

Neutral-atom and trapped-ion processors are two prominent atomic platforms for quantum computing. This dossier compares their gate and readout records, register sizes, error-correction experiments, interconnect work and architectural proposals as of late October 2026. The main takeaway is a split lead: the Helios ion processor reports the lowest two-qubit error figure covered here, though as a system average, while atom arrays hold the largest trapped registers and the logical-level demonstrations covered here.

4,839 words42 sources28 evidence-mapped claims21 benchmarks17 timeline events✓ citation-verified Oct 30, 2026

AI-assisted synthesis of the cited literature, independently fact-checked against its sources; not peer reviewed.

Contents

  1. Executive summary
  2. Background and core concepts
  3. Timeline of key milestones
  4. State of the art
  5. Trapped ions: system benchmarks and QCCD hardware
  6. Neutral atoms: gate fidelity and encodings
  7. Arrays, assembly and tweezer control
  8. Logical qubits, readout and error correction
  9. Interconnects and modular architectures
  10. Quantitative benchmarks
  11. Open problems and active debates
  12. Major programs and players
  13. Outlook: what to watch (next 12-18 months)
  14. Key papers
  15. Glossary

Sample findings

  • Helios reports average infidelities of 7.9(2)×10^-4 for two-qubit gates, 2.5(1)×10^-5 for single-qubit gates and 4.8(6)×10^-4 for state preparation and measurement, each averaged over all operational zones of a 98-qubit trapped-ion processor.
  • Parallel two-qubit gates reached 99.5% fidelity on up to 60 atoms; the method uses optimal-control pulses and dark states to limit scattering.
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