openapi: 3.0.3
info:
  contact:
    email: support@ionq.co
    name: IonQ
    url: https://ionq.com/
  description: '*Last updated: May 15, 2026*

    IonQ''s API for accessing the IonQ Quantum Cloud platform


    Please subscribe for automated updates when we perform maintenance or

    experience an outage.


    In addition, you may use the [status endpoint](#tag/status) to check the

    current status of our API.


    ## Authentication


    <SecurityDefinitions />

    '
  title: IonQ Cloud Platform backends Sessions API
  version: v0.4
servers:
- url: https://api.ionq.co/v0.4
tags:
- name: Sessions
paths:
  /sessions:
    post:
      operationId: CreateSession
      responses:
        '201':
          description: Created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Session'
      security:
      - apiKeyAuth: []
      parameters: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateSessionRequest'
      tags:
      - Sessions
    get:
      operationId: GetSessions
      responses:
        '200':
          description: Successfully retrieved a list of sessions.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SessionsResponse'
      security:
      - apiKeyAuth: []
      parameters:
      - in: query
        name: active
        required: false
        schema:
          type: boolean
      tags:
      - Sessions
  /sessions/{session_id}/end:
    post:
      operationId: EndSession
      responses:
        '200':
          description: Successfully end a session.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Session'
      security:
      - apiKeyAuth: []
      parameters:
      - description: The id of the session — this id is provided in the response on session creation.
        in: path
        name: session_id
        required: true
        schema:
          type: string
      tags:
      - Sessions
  /sessions/{session_id}:
    get:
      operationId: GetSession
      responses:
        '200':
          description: Successfully retrieved a session.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Session'
      security:
      - apiKeyAuth: []
      parameters:
      - description: The id of the session — this id is provided in the response on session creation.
        in: path
        name: session_id
        required: true
        schema:
          type: string
      tags:
      - Sessions
  /sessions/{session_id}/jobs:
    get:
      operationId: GetSessionJobs
      responses:
        '200':
          description: Successfully retrieved a list of jobs from a session.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetJobsResponse'
              examples:
                Example 1:
                  value:
                    jobs:
                    - id: e1a09d90-b2ba-4ea5-9fd7-4bfc14eac524
                      status: completed
                      type: ionq.circuit.v1
                      backend: simulator
                      dry_run: false
                      cost_model: quantum_compute_time
                      submitter_id: 64b03577072d45001c85e9c4
                      project_id: 1333d459-cf47-4a5e-acc1-8d4eb4f7b025
                      parent_job_id: null
                      session_id: null
                      metadata: null
                      name: null
                      submitted_at: '2025-05-28T20:47:05.440Z'
                      started_at: null
                      completed_at: null
                      predicted_execution_duration_ms: null
                      predicted_wait_time_ms: null
                      execution_duration_ms: null
                      shots: 1000
                      noise:
                        model: ideal
                      failure: null
                      settings:
                        compilation: {}
                      stats:
                        qubits: 20
                        circuits: 1
                        gate_counts:
                          1q: 1028
                          2q: 110
                        predicted_quantum_compute_time_us: 5000
                        billed_quantum_compute_time_us: 5200
                      results:
                        probabilities:
                          url: /v0.4/jobs/e1a09d90-b2ba-4ea5-9fd7-4bfc14eac524/results/probabilities
                      output: {}
                    next: null
      security:
      - apiKeyAuth: []
      parameters:
      - in: path
        name: session_id
        required: true
        schema:
          type: string
      - in: query
        name: ids
        required: false
        schema:
          type: array
          items:
            type: string
      - in: query
        name: parent_job_id
        required: false
        schema:
          type: string
      - in: query
        name: status
        required: false
        schema:
          $ref: '#/components/schemas/JobStatus'
      - description: Filter jobs by backend target. Supports single target or comma-separated list of targets.
        in: query
        name: target
        required: false
        schema:
          type: string
        example: simulator
      - in: query
        name: session_id
        required: false
        schema:
          type: string
      - description: The id of another user within a shared project to view their submitted jobs. Ignored if not a project member.
        in: query
        name: submitter_id
        required: false
        schema:
          type: string
      - in: query
        name: limit
        required: false
        schema:
          format: int32
          type: integer
      - in: query
        name: next
        required: false
        schema:
          type: string
      tags:
      - Sessions
components:
  schemas:
    SessionSettings:
      properties:
        job_count_limit:
          type: integer
          format: int32
        duration_limit_min:
          type: integer
          format: int32
        cost_limit:
          $ref: '#/components/schemas/SessionCostLimit'
        expires_at:
          type: string
          format: date-time
      type: object
      additionalProperties: false
    GetJobsResponse:
      properties:
        jobs:
          items:
            $ref: '#/components/schemas/BaseJob'
          type: array
        next:
          type: string
          nullable: true
      required:
      - jobs
      - next
      type: object
      additionalProperties: false
    SessionStatusEnum:
      enum:
      - created
      - started
      - ended
      type: string
    SessionsResponse:
      properties:
        organization_id:
          type: string
        sessions:
          items:
            $ref: '#/components/schemas/Session'
          type: array
      required:
      - organization_id
      - sessions
      type: object
      additionalProperties: false
    CreateSessionRequest:
      properties:
        backend:
          type: string
        settings:
          $ref: '#/components/schemas/SessionSettingsRequest'
      required:
      - backend
      type: object
      additionalProperties: false
    SessionCostLimit:
      properties:
        unit:
          type: string
        value:
          type: number
          format: double
      required:
      - unit
      - value
      type: object
      additionalProperties: false
    Noise:
      properties:
        model:
          $ref: '#/components/schemas/NoiseModel'
        seed:
          type: integer
          format: int32
      required:
      - model
      type: object
      additionalProperties: false
    IsoTimestamp:
      type: string
    CostModel:
      type: string
      enum:
      - quantum_compute_time
      - execution_time
    NoiseModel:
      type: string
      enum:
      - ideal
      - harmony
      - harmony-1
      - harmony-2
      - aria-1
      - aria-2
      - forte-1
      - forte-enterprise-1
    JsonObject:
      properties: {}
      type: object
      additionalProperties: {}
    Session:
      properties:
        id:
          type: string
          description: The id of the session.
        created_at:
          type: string
          format: date-time
        organization_id:
          type: string
        backend:
          type: string
          nullable: true
        project_id:
          type: string
          nullable: true
        creator_id:
          type: string
          nullable: true
        ended_at:
          type: string
          format: date-time
          nullable: true
        ender_id:
          type: string
          nullable: true
        settings:
          $ref: '#/components/schemas/SessionSettings'
        active:
          type: boolean
        status:
          $ref: '#/components/schemas/SessionStatusEnum'
        started_at:
          type: string
          format: date-time
          nullable: true
      required:
      - id
      - created_at
      - organization_id
      - backend
      - project_id
      - creator_id
      - ended_at
      - ender_id
      - active
      - status
      - started_at
      type: object
      additionalProperties: false
    SessionSettingsRequest:
      properties:
        job_count_limit:
          type: integer
          format: int32
        duration_limit_min:
          type: integer
          format: int32
        cost_limit:
          $ref: '#/components/schemas/SessionCostLimit'
      type: object
      additionalProperties: false
    BaseJob:
      properties:
        id:
          type: string
        status:
          $ref: '#/components/schemas/JobStatus'
        type:
          type: string
        backend:
          type: string
        dry_run:
          type: boolean
        submitter_id:
          type: string
          description: The id of the user who submitted the job
        project_id:
          type: string
          nullable: true
        parent_job_id:
          type: string
          nullable: true
        session_id:
          type: string
          nullable: true
        metadata:
          allOf:
          - $ref: '#/components/schemas/JobMetadata'
          nullable: true
        name:
          type: string
          nullable: true
        submitted_at:
          $ref: '#/components/schemas/IsoTimestamp'
        started_at:
          allOf:
          - $ref: '#/components/schemas/IsoTimestamp'
          nullable: true
        completed_at:
          allOf:
          - $ref: '#/components/schemas/IsoTimestamp'
          nullable: true
        predicted_wait_time_ms:
          type: integer
          format: int32
          nullable: true
        predicted_execution_duration_ms:
          type: integer
          format: int32
          nullable: true
        execution_duration_ms:
          type: integer
          format: int32
          nullable: true
          description: How long the job actually took to run on the QPU. Null if the job hasn't run yet.
        shots:
          type: integer
          format: int32
        noise:
          $ref: '#/components/schemas/Noise'
          description: Only present in the response when `backend` is simulator.
        failure:
          allOf:
          - $ref: '#/components/schemas/Failure'
          nullable: true
        cost_model:
          $ref: '#/components/schemas/CostModel'
          description: The billing model used for this job.
        output:
          $ref: '#/components/schemas/JsonObject'
        settings:
          $ref: '#/components/schemas/JsonObject'
        stats:
          $ref: '#/components/schemas/JsonObject'
        results:
          allOf:
          - $ref: '#/components/schemas/JsonObject'
          nullable: true
      required:
      - id
      - status
      - type
      - backend
      - dry_run
      - submitter_id
      - project_id
      - parent_job_id
      - session_id
      - metadata
      - name
      - submitted_at
      - started_at
      - completed_at
      - predicted_wait_time_ms
      - predicted_execution_duration_ms
      - execution_duration_ms
      - failure
      - output
      - settings
      - stats
      - results
      type: object
      additionalProperties: false
    JobStatus:
      type: string
      enum:
      - submitted
      - ready
      - started
      - canceled
      - failed
      - completed
    Failure:
      properties:
        code:
          type: string
          enum:
          - InvalidInput
          - CompilationError
          - ContractExpiredError
          - DebiasingError
          - InternalError
          - NotEnoughQubits
          - OptimizationError
          - PreflightError
          - QuantumCircuitComplexityError
          - QuantumComputerError
          - QuotaExhaustedError
          - SimulationError
          - SimulationTimeout
          - SystemCancel
          - TooLongPredictedExecutionTime
          - TooManyControls
          - TooManyGates
          - TooManyShots
          - UnknownBillingError
          - UnsupportedGate
        message:
          type: string
      required:
      - code
      - message
      type: object
      additionalProperties: false
    JobMetadata:
      properties: {}
      type: object
      additionalProperties:
        type: string
  securitySchemes:
    apiKeyAuth:
      description: 'API keys are associated with a user and can be created on the [IonQ Quantum Cloud](https://cloud.ionq.com) application. To authenticate, prefix your API Key with `apiKey ` and place it in the `Authorization` request header. Ex: `Authorization: apiKey your-api-key`'
      in: header
      name: Authorization
      type: apiKey