IBM Quantum Select Backend and Submit Job

arazzo: 1.0.1
info:
  title: IBM Quantum Select Backend and Submit Job
  summary: List accessible backends, inspect a chosen backend's configuration, and submit a job to it.
  description: >-
    A backend-aware submission flow. The workflow enumerates every backend the
    service instance can reach, reads the chosen backend's configuration to
    confirm its qubit count and basis gates, and then submits a primitive job to
    that backend. Each request inlines its bearer token, Service-CRN, and
    IBM-API-Version headers so the flow can be read and executed without opening
    the underlying OpenAPI descriptions.
  version: 1.0.0
sourceDescriptions:
- name: backendsApi
  url: ../openapi/ibm-quantum-backends-api-openapi.yml
  type: openapi
- name: jobsApi
  url: ../openapi/ibm-quantum-jobs-api-openapi.yml
  type: openapi
workflows:
- workflowId: select-backend-and-submit-job
  summary: Discover backends, verify a backend's configuration, and submit a job to it.
  description: >-
    Lists backends, retrieves the chosen backend's configuration, and submits a
    primitive job to that backend.
  inputs:
    type: object
    required:
    - accessToken
    - serviceCrn
    - apiVersion
    - backend
    - programId
    - params
    properties:
      accessToken:
        type: string
        description: IBM Cloud IAM bearer token used in the Authorization header.
      serviceCrn:
        type: string
        description: IBM Cloud Service CRN identifying the Qiskit Runtime instance.
      apiVersion:
        type: string
        description: API version date sent in the IBM-API-Version header (e.g. 2026-03-15).
      backend:
        type: string
        description: Name of the backend to inspect and target (e.g. ibm_brisbane).
      programId:
        type: string
        description: ID of the primitive program to execute.
      params:
        type: object
        description: The primitive input params object.
  steps:
  - stepId: listBackends
    description: >-
      Enumerate all backends the service instance has access to, with their
      status and queue lengths.
    operationId: list_backends
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $inputs.accessToken"
    - name: Service-CRN
      in: header
      value: $inputs.serviceCrn
    - name: IBM-API-Version
      in: header
      value: $inputs.apiVersion
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      devices: $response.body#/devices
  - stepId: getBackendConfiguration
    description: >-
      Read the chosen backend's configuration to confirm its qubit count and
      basis gates before submitting an ISA circuit to it.
    operationId: get_backend_configuration
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $inputs.accessToken"
    - name: Service-CRN
      in: header
      value: $inputs.serviceCrn
    - name: IBM-API-Version
      in: header
      value: $inputs.apiVersion
    - name: id
      in: path
      value: $inputs.backend
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      nQubits: $response.body#/n_qubits
      basisGates: $response.body#/basis_gates
  - stepId: submitJob
    description: >-
      Submit the primitive job to the validated backend and capture the new job
      id.
    operationId: create_job
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $inputs.accessToken"
    - name: Service-CRN
      in: header
      value: $inputs.serviceCrn
    - name: IBM-API-Version
      in: header
      value: $inputs.apiVersion
    requestBody:
      contentType: application/json
      payload:
        program_id: $inputs.programId
        backend: $inputs.backend
        params: $inputs.params
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      jobId: $response.body#/id
      assignedBackend: $response.body#/backend
  outputs:
    devices: $steps.listBackends.outputs.devices
    nQubits: $steps.getBackendConfiguration.outputs.nQubits
    jobId: $steps.submitJob.outputs.jobId