Estimate then run a Chemistry VQE workload on Quandela Quantum Toolbox

Estimate then run a Chemistry VQE workload on Quandela Quantum Toolbox

Cost-gated Chemistry VQE execution on Quandela Cloud.

1. Mint a short-lived Cloud Job Token for this run.
2. Price the workload WITHOUT running it. Gate on nb_total_shots against the caller's shot_budget before spending anything.
3. Read max_running_qt_jobs / num_running_qt_jobs. The Quantum Toolbox ceiling is enforced as 403 "Cannot have more than {MAX_QT_JOBS} running Quantum Toolbox jobs" — note it is a 403, unlike the Perceval waiting-job ceiling which is a 400.
4. Submit the workload. There is no idempotency key and no process_id guard on the Toolbox surface, so persist the returned job_id immediately — there is no job list endpoint to recover it from.
5. Poll with exponential backoff. VQE status responses can carry IntermediateChemistryVqeResults, so convergence is observable before the job terminates.
6. Collect ChemistryVqeResults.
7. Read the per-platform consumption ledger for this token — credits and free_credits are reported separately. The only way to answer "what did this run consume"; note that no price list is published, so cost in currency is not knowable.
8. Revoke the run's token.

What you'll need to have ready

• account_token: Account access token from account.quandela.com (Bearer).
• token_label
• chemistry_params: ChemistryVqeParams body, including the Atom[] molecular specification. Identical body is sent to the estimator and the run.
• shot_budget: Caller's ceiling. Compare against the estimator's nb_total_shots before submitting; abort if it exceeds this.

For your developer

Arazzo workflow quandela:estimate-and-run-chemistry-vqe, 8 operations: $sourceDescriptions.apiPercevalJobTokenApi.post_api_tokens → $sourceDescriptions.quantumtoolboxApi.post_qt_chemistryvqe_estimate → $sourceDescriptions.apiPercevalJobApi.get_api_jobs_availability → $sourceDescriptions.quantumtoolboxApi.post_qt_chemistryvqe → $sourceDescriptions.quantumtoolboxApi.get_qt_chemistryvqe_by_job_id_status → $sourceDescriptions.quantumtoolboxApi.get_qt_chemistryvqe_by_job_id_results → $sourceDescriptions.apiPercevalJobTokenApi.get_api_tokens_usage_report → $sourceDescriptions.apiPercevalJobTokenApi.post_api_tokens_revoke. Specs on APIs.io.