openapi: 3.0.3
info:
  title: Google Quantum Engine API
  version: v1alpha1
  description: |
    REST surface of the Google Quantum Engine service (`quantum.googleapis.com`,
    `google.cloud.quantum.v1alpha1.QuantumEngineService`). The Quantum Engine
    accepts hardware-compatible quantum circuits as **programs**, executes them
    as **jobs** on Google's superconducting **processors** (Willow- and
    Sycamore-class), manages **reservations** of processor time, and exposes
    processor **calibration** snapshots. The canonical client is the
    `cirq-google` Python package (`cirq_google.Engine`).

    Access is restricted: callers must use a Google Cloud project with the
    Quantum Engine API enabled, be on the approved-user list, and authenticate
    using Application Default Credentials (OAuth 2.0 with the
    `https://www.googleapis.com/auth/cloud-platform` scope).
  contact:
    name: Cirq Maintainers
    email: cirq-maintainers@googlegroups.com
    url: https://quantumai.google/cirq/google/engine
  license:
    name: Google APIs Terms of Service
    url: https://developers.google.com/terms
servers:
- url: https://quantum.googleapis.com
  description: Production Quantum Engine endpoint
security:
- googleOAuth:
  - https://www.googleapis.com/auth/cloud-platform
tags:
- name: Programs
  description: Hardware-compatible circuits uploaded to a Google Cloud project.
- name: Jobs
  description: Executions of a program against a processor or simulator backend.
- name: Processors
  description: Quantum processing units (Willow, Sycamore-class) available to the project.
- name: Calibrations
  description: Periodic device performance snapshots.
- name: Reservations
  description: Processor time-slot reservations and budgets.
- name: Results
  description: Measurement results returned by completed jobs.
paths:
  /v1alpha1/{parent}/programs:
    parameters:
    - $ref: '#/components/parameters/ParentProject'
    post:
      tags: [Programs]
      operationId: CreateQuantumProgram
      summary: Create Quantum Program
      description: Upload a quantum program (a hardware-compatible serialised circuit) to a Google Cloud project.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/QuantumProgram'
      responses:
        '200':
          description: Program created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumProgram'
    get:
      tags: [Programs]
      operationId: ListQuantumPrograms
      summary: List Quantum Programs
      description: List programs in a project, with optional label, time, and pagination filters.
      parameters:
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      - $ref: '#/components/parameters/Filter'
      responses:
        '200':
          description: A page of programs.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListQuantumProgramsResponse'
  /v1alpha1/{name}:
    parameters:
    - $ref: '#/components/parameters/ProgramName'
    get:
      tags: [Programs]
      operationId: GetQuantumProgram
      summary: Get Quantum Program
      description: Retrieve a single quantum program by resource name.
      responses:
        '200':
          description: The requested program.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumProgram'
    patch:
      tags: [Programs]
      operationId: UpdateQuantumProgram
      summary: Update Quantum Program
      description: Update mutable fields (labels, description) on a quantum program.
      parameters:
      - $ref: '#/components/parameters/UpdateMask'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/QuantumProgram'
      responses:
        '200':
          description: Updated program.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumProgram'
    delete:
      tags: [Programs]
      operationId: DeleteQuantumProgram
      summary: Delete Quantum Program
      description: Delete a quantum program (and cascade-delete its jobs).
      responses:
        '200':
          description: Program deleted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Empty'
  /v1alpha1/{parent}/jobs:
    parameters:
    - $ref: '#/components/parameters/ParentProgram'
    post:
      tags: [Jobs]
      operationId: CreateQuantumJob
      summary: Create Quantum Job
      description: Submit a new job to execute a program on a processor or simulator backend.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/QuantumJob'
      responses:
        '200':
          description: Job created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumJob'
    get:
      tags: [Jobs]
      operationId: ListQuantumJobs
      summary: List Quantum Jobs
      description: List jobs belonging to a program. Supports filtering by state, label, and creation time.
      parameters:
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      - $ref: '#/components/parameters/Filter'
      responses:
        '200':
          description: A page of jobs.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListQuantumJobsResponse'
  /v1alpha1/{name}/job:
    parameters:
    - $ref: '#/components/parameters/JobName'
    get:
      tags: [Jobs]
      operationId: GetQuantumJob
      summary: Get Quantum Job
      description: Retrieve a single quantum job by resource name.
      responses:
        '200':
          description: The requested job.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumJob'
    patch:
      tags: [Jobs]
      operationId: UpdateQuantumJob
      summary: Update Quantum Job
      description: Update mutable fields (labels, description, priority) on a job.
      parameters:
      - $ref: '#/components/parameters/UpdateMask'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/QuantumJob'
      responses:
        '200':
          description: Updated job.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumJob'
    delete:
      tags: [Jobs]
      operationId: DeleteQuantumJob
      summary: Delete Quantum Job
      description: Delete a quantum job and its results.
      responses:
        '200':
          description: Job deleted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Empty'
  /v1alpha1/{name}:cancel:
    parameters:
    - $ref: '#/components/parameters/JobName'
    post:
      tags: [Jobs]
      operationId: CancelQuantumJob
      summary: Cancel Quantum Job
      description: Cancel a queued or running quantum job.
      responses:
        '200':
          description: Job cancellation accepted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Empty'
  /v1alpha1/{parent}/result:
    parameters:
    - $ref: '#/components/parameters/JobParent'
    get:
      tags: [Results]
      operationId: GetQuantumResult
      summary: Get Quantum Result
      description: Retrieve the serialised measurement result of a completed quantum job.
      responses:
        '200':
          description: Job result.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumResult'
  /v1alpha1/{parent}/events:
    parameters:
    - $ref: '#/components/parameters/JobParent'
    get:
      tags: [Jobs]
      operationId: ListQuantumJobEvents
      summary: List Quantum Job Events
      description: List lifecycle events emitted for a job (queued, running, completed, failed).
      parameters:
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      responses:
        '200':
          description: A page of job events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListQuantumJobEventsResponse'
  /v1alpha1/{parent}/processors:
    parameters:
    - $ref: '#/components/parameters/ParentProject'
    get:
      tags: [Processors]
      operationId: ListQuantumProcessors
      summary: List Quantum Processors
      description: List processors visible to the Google Cloud project.
      parameters:
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      - $ref: '#/components/parameters/Filter'
      responses:
        '200':
          description: A page of processors.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListQuantumProcessorsResponse'
  /v1alpha1/{name}/processor:
    parameters:
    - $ref: '#/components/parameters/ProcessorName'
    get:
      tags: [Processors]
      operationId: GetQuantumProcessor
      summary: Get Quantum Processor
      description: Retrieve a single quantum processor and its current device specification.
      responses:
        '200':
          description: The requested processor.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumProcessor'
  /v1alpha1/{parent}/calibrations:
    parameters:
    - $ref: '#/components/parameters/ProcessorParent'
    get:
      tags: [Calibrations]
      operationId: ListQuantumCalibrations
      summary: List Quantum Calibrations
      description: List historical calibration snapshots for a processor.
      parameters:
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      - $ref: '#/components/parameters/Filter'
      responses:
        '200':
          description: A page of calibrations.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListQuantumCalibrationsResponse'
  /v1alpha1/{name}/calibration:
    parameters:
    - $ref: '#/components/parameters/CalibrationName'
    get:
      tags: [Calibrations]
      operationId: GetQuantumCalibration
      summary: Get Quantum Calibration
      description: Retrieve a single calibration snapshot for a processor.
      responses:
        '200':
          description: The requested calibration.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumCalibration'
  /v1alpha1/{parent}/reservations:
    parameters:
    - $ref: '#/components/parameters/ProcessorParent'
    post:
      tags: [Reservations]
      operationId: CreateQuantumReservation
      summary: Create Quantum Reservation
      description: Reserve a future time window on a quantum processor.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/QuantumReservation'
      responses:
        '200':
          description: Reservation created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumReservation'
    get:
      tags: [Reservations]
      operationId: ListQuantumReservations
      summary: List Quantum Reservations
      description: List reservations on a processor.
      parameters:
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      - $ref: '#/components/parameters/Filter'
      responses:
        '200':
          description: A page of reservations.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListQuantumReservationsResponse'
  /v1alpha1/{name}/reservation:
    parameters:
    - $ref: '#/components/parameters/ReservationName'
    get:
      tags: [Reservations]
      operationId: GetQuantumReservation
      summary: Get Quantum Reservation
      description: Retrieve a single processor reservation.
      responses:
        '200':
          description: The requested reservation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumReservation'
    patch:
      tags: [Reservations]
      operationId: UpdateQuantumReservation
      summary: Update Quantum Reservation
      description: Update a reservation's window or whitelisted users.
      parameters:
      - $ref: '#/components/parameters/UpdateMask'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/QuantumReservation'
      responses:
        '200':
          description: Updated reservation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumReservation'
    delete:
      tags: [Reservations]
      operationId: DeleteQuantumReservation
      summary: Delete Quantum Reservation
      description: Delete an upcoming reservation.
      responses:
        '200':
          description: Reservation deleted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Empty'
  /v1alpha1/{name}/reservation:cancel:
    parameters:
    - $ref: '#/components/parameters/ReservationName'
    post:
      tags: [Reservations]
      operationId: CancelQuantumReservation
      summary: Cancel Quantum Reservation
      description: Cancel an in-progress reservation, freeing its remaining time.
      responses:
        '200':
          description: Reservation cancellation accepted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Empty'
  /v1alpha1/{parent}/timeSlots:
    parameters:
    - $ref: '#/components/parameters/ProcessorParent'
    get:
      tags: [Reservations]
      operationId: ListQuantumTimeSlots
      summary: List Quantum Time Slots
      description: List the OPEN_SWIM / MAINTENANCE / RESERVATION / UNALLOCATED time slots for a processor.
      parameters:
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      - $ref: '#/components/parameters/Filter'
      responses:
        '200':
          description: A page of time slots.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListQuantumTimeSlotsResponse'
  /v1alpha1/{parent}/reservationBudgets:
    parameters:
    - $ref: '#/components/parameters/ParentProject'
    get:
      tags: [Reservations]
      operationId: ListQuantumReservationBudgets
      summary: List Quantum Reservation Budgets
      description: List the reservation budgets allocated to a project.
      parameters:
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      responses:
        '200':
          description: A page of reservation budgets.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListQuantumReservationBudgetsResponse'
  /v1alpha1/{parent}/reservationGrant:
    parameters:
    - $ref: '#/components/parameters/ParentProject'
    get:
      tags: [Reservations]
      operationId: ListQuantumReservationGrants
      summary: List Quantum Reservation Grants
      description: List the reservation grants (sponsorship records) available to a project.
      parameters:
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      responses:
        '200':
          description: A page of reservation grants.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListQuantumReservationGrantsResponse'
  /v1alpha1/{name}:reallocate:
    parameters:
    - $ref: '#/components/parameters/ReservationGrantName'
    post:
      tags: [Reservations]
      operationId: ReallocateQuantumReservationGrant
      summary: Reallocate Quantum Reservation Grant
      description: Move budget between projects sharing a reservation grant.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ReallocateRequest'
      responses:
        '200':
          description: Grant reallocated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuantumReservationGrant'
components:
  securitySchemes:
    googleOAuth:
      type: oauth2
      description: OAuth 2.0 via Google Cloud Application Default Credentials.
      flows:
        authorizationCode:
          authorizationUrl: https://accounts.google.com/o/oauth2/auth
          tokenUrl: https://oauth2.googleapis.com/token
          scopes:
            https://www.googleapis.com/auth/cloud-platform: Read/write access to Google Cloud resources, including Quantum Engine.
  parameters:
    ParentProject:
      name: parent
      in: path
      required: true
      description: The parent project resource, formatted as `projects/{project_id}`.
      schema:
        type: string
        pattern: '^projects/[^/]+$'
    ParentProgram:
      name: parent
      in: path
      required: true
      description: The parent program resource, formatted as `projects/{project_id}/programs/{program_id}`.
      schema:
        type: string
        pattern: '^projects/[^/]+/programs/[^/]+$'
    ProcessorParent:
      name: parent
      in: path
      required: true
      description: The parent processor resource, formatted as `projects/{project_id}/processors/{processor_id}`.
      schema:
        type: string
        pattern: '^projects/[^/]+/processors/[^/]+$'
    JobParent:
      name: parent
      in: path
      required: true
      description: The parent job resource, formatted as `projects/{project_id}/programs/{program_id}/jobs/{job_id}`.
      schema:
        type: string
        pattern: '^projects/[^/]+/programs/[^/]+/jobs/[^/]+$'
    ProgramName:
      name: name
      in: path
      required: true
      description: The program resource name.
      schema:
        type: string
    JobName:
      name: name
      in: path
      required: true
      description: The job resource name.
      schema:
        type: string
    ProcessorName:
      name: name
      in: path
      required: true
      description: The processor resource name.
      schema:
        type: string
    CalibrationName:
      name: name
      in: path
      required: true
      description: The calibration resource name.
      schema:
        type: string
    ReservationName:
      name: name
      in: path
      required: true
      description: The reservation resource name.
      schema:
        type: string
    ReservationGrantName:
      name: name
      in: path
      required: true
      description: The reservation grant resource name.
      schema:
        type: string
    PageSize:
      name: pageSize
      in: query
      description: Maximum number of items to return in a page.
      schema:
        type: integer
        format: int32
        minimum: 1
        maximum: 1000
    PageToken:
      name: pageToken
      in: query
      description: Continuation token from a previous list response.
      schema:
        type: string
    Filter:
      name: filter
      in: query
      description: AIP-160 filter expression (e.g., `labels.team = quantum`, `executionStatus.state = SUCCESS`).
      schema:
        type: string
    UpdateMask:
      name: updateMask
      in: query
      description: FieldMask listing fields to update.
      schema:
        type: string
  schemas:
    Empty:
      type: object
      description: An empty response body.
    QuantumProgram:
      type: object
      description: A quantum program — a serialised quantum circuit uploaded to a project.
      properties:
        name:
          type: string
          description: Resource name `projects/{project_id}/programs/{program_id}`.
        createTime:
          type: string
          format: date-time
        updateTime:
          type: string
          format: date-time
        labels:
          type: object
          additionalProperties:
            type: string
        labelFingerprint:
          type: string
        description:
          type: string
        code:
          type: object
          description: Serialised Cirq/Quantum Engine circuit payload (`google.protobuf.Any`).
    QuantumJob:
      type: object
      description: An execution of a quantum program on a processor or simulator.
      properties:
        name:
          type: string
          description: Resource name `projects/{project_id}/programs/{program_id}/jobs/{job_id}`.
        createTime:
          type: string
          format: date-time
        updateTime:
          type: string
          format: date-time
        labels:
          type: object
          additionalProperties:
            type: string
        labelFingerprint:
          type: string
        description:
          type: string
        scheduling_config:
          $ref: '#/components/schemas/SchedulingConfig'
        run_context:
          type: object
          description: Serialised `google.protobuf.Any` run context (sweep parameters, repetitions).
        executionStatus:
          $ref: '#/components/schemas/ExecutionStatus'
    SchedulingConfig:
      type: object
      description: Job scheduling configuration including processor selector and priority.
      properties:
        processor_selector:
          type: object
          properties:
            processor_names:
              type: array
              items:
                type: string
        priority:
          type: integer
          format: int32
    ExecutionStatus:
      type: object
      description: Current state of a quantum job.
      properties:
        state:
          type: string
          enum:
          - STATE_UNSPECIFIED
          - READY
          - RUNNING
          - CANCELLING
          - CANCELLED
          - SUCCESS
          - FAILURE
        processorName:
          type: string
        failure:
          type: object
          properties:
            errorCode:
              type: string
            errorMessage:
              type: string
    QuantumResult:
      type: object
      description: Measurement results for a completed quantum job.
      properties:
        parent:
          type: string
        result:
          type: object
          description: Serialised `google.protobuf.Any` Cirq result payload.
    QuantumProcessor:
      type: object
      description: A quantum processing unit available to the project.
      properties:
        name:
          type: string
        health:
          type: string
          enum:
          - HEALTH_UNSPECIFIED
          - OK
          - DOWN
          - UNAVAILABLE
        expectedDownTime:
          type: string
          format: date-time
        expectedRecoveryTime:
          type: string
          format: date-time
        supportedDeviceTypes:
          type: array
          items:
            type: string
        deviceSpec:
          type: object
          description: Serialised `DeviceSpecification` protobuf.
    QuantumCalibration:
      type: object
      description: A calibration snapshot for a processor.
      properties:
        name:
          type: string
        timestamp:
          type: string
          format: date-time
        data:
          type: object
          description: Serialised `Metrics` protobuf with per-gate and per-qubit calibration metrics.
    QuantumReservation:
      type: object
      description: A reservation of processor time.
      properties:
        name:
          type: string
        startTime:
          type: string
          format: date-time
        endTime:
          type: string
          format: date-time
        whitelistedUsers:
          type: array
          items:
            type: string
    QuantumReservationGrant:
      type: object
      description: A reservation budget allocation granted to a project.
      properties:
        name:
          type: string
        grantedDuration:
          type: string
        consumedDuration:
          type: string
        whitelistedProjects:
          type: array
          items:
            type: string
    ReallocateRequest:
      type: object
      properties:
        projectId:
          type: string
        duration:
          type: string
          description: Duration in seconds (e.g. `3600s`).
    ListQuantumProgramsResponse:
      type: object
      properties:
        programs:
          type: array
          items:
            $ref: '#/components/schemas/QuantumProgram'
        nextPageToken:
          type: string
    ListQuantumJobsResponse:
      type: object
      properties:
        jobs:
          type: array
          items:
            $ref: '#/components/schemas/QuantumJob'
        nextPageToken:
          type: string
    ListQuantumJobEventsResponse:
      type: object
      properties:
        events:
          type: array
          items:
            type: object
            properties:
              eventTime:
                type: string
                format: date-time
              executionStatus:
                $ref: '#/components/schemas/ExecutionStatus'
        nextPageToken:
          type: string
    ListQuantumProcessorsResponse:
      type: object
      properties:
        processors:
          type: array
          items:
            $ref: '#/components/schemas/QuantumProcessor'
        nextPageToken:
          type: string
    ListQuantumCalibrationsResponse:
      type: object
      properties:
        calibrations:
          type: array
          items:
            $ref: '#/components/schemas/QuantumCalibration'
        nextPageToken:
          type: string
    ListQuantumReservationsResponse:
      type: object
      properties:
        reservations:
          type: array
          items:
            $ref: '#/components/schemas/QuantumReservation'
        nextPageToken:
          type: string
    ListQuantumTimeSlotsResponse:
      type: object
      properties:
        timeSlots:
          type: array
          items:
            type: object
            properties:
              startTime:
                type: string
                format: date-time
              endTime:
                type: string
                format: date-time
              slotType:
                type: string
                enum:
                - TIME_SLOT_TYPE_UNSPECIFIED
                - OPEN_SWIM
                - MAINTENANCE
                - RESERVATION
                - UNALLOCATED
        nextPageToken:
          type: string
    ListQuantumReservationBudgetsResponse:
      type: object
      properties:
        reservationBudgets:
          type: array
          items:
            type: object
            properties:
              name:
                type: string
              grantedDuration:
                type: string
              availableDuration:
                type: string
        nextPageToken:
          type: string
    ListQuantumReservationGrantsResponse:
      type: object
      properties:
        reservationGrants:
          type: array
          items:
            $ref: '#/components/schemas/QuantumReservationGrant'
        nextPageToken:
          type: string