Research preprint
The Chemistry Performance Envelope.
Circuit resources, energy prediction and conditional processor budgets.
Publication status: Research preprint. Not peer reviewed; not accepted for journal publication.
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Submitted manuscript · 16 pages · PDF
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What the study examines
Qubit count alone does not describe the cost or accuracy of a quantum-chemistry calculation. We examine compiled circuits, molecular energy references and noise assumptions together, using small active-space benchmarks, a reproducible six-qubit circuit and a hydrogen mitigation campaign.
Findings
- The supplied six-qubit circuit contains 1,433 controlled-Z gates. Its ideal energy is 3.954 mHa above the supplied operator’s global minimum.
- Across seven hydrogen geometries, mean absolute deviation falls from 9.734 mHa for raw estimates to 3.153 mHa with combined readout and zero-noise mitigation. One point is below 1.6 mHa; the available repeat intervals straddle that target.
- A conditional budget translates an energy allowance into a gate-error requirement. The illustrative BeH₂ limit is 8.110 × 10⁻⁶ under the paper’s specified model assumptions.
How to interpret the results
The noise-model comparisons are retrospective. The chip budgets are conditional calculations, and the repeat campaign is incomplete. Offline replay checks the supplied circuit and arithmetic; it does not independently authenticate original processor execution. These results do not demonstrate performance of a fabricated Atomic Cubit processor.
Supporting materials
The downloads preserve the submitted version. The supplement and guide explain the numerical inputs, methods and reproducibility limits.
- Supplementary information: View PDF ↗ · Download PDF
- Download data and reproduction code (ZIP)
- Read reproduction guide ↗
Discuss the research
We welcome technical feedback on the energy references, noise model, statistical interpretation and reproducibility. Contact team@atomiccubit.com.