---
title: "Get All Backend Characterizations"
method: GET
path: "/characterizations/backends/{backend}"
tags: ["characterizations"]
---

# Get All Backend Characterizations

`GET /characterizations/backends/{backend}`

This endpoint retrieves an array of all available backend characterizations, with pagination.

## Path parameters

- `backend` 'qpu.aria-1' | 'qpu.aria-2' | 'qpu.forte-1' | 'qpu.forte-enterprise-1', required

## Query parameters

- `start` integer
- `end` integer
- `limit` integer
- `page` integer — Specify the page of results to return.

## Response `200`

Successfully retrieved characterizations.

- object — Response body from requesting characterization data.
  - `characterizations` Characterization[], required — A page of characterizations measurements.
    - `backend` string — The backend calibrated hardware: `simulator`, `qpu.aria-1`, `qpu.aria-2`, `qpu.forte-1`, `qpu.forte-enterprise-1`
    - `connectivity` array[] — An array of valid, unordered tuples of possible qubits for executing two-qubit gates (e.g., `[[0, 1], [0, 2], [1, 2]]`)
      - integer[]
    - `date` string — Date time of the measurement, in ISO format.
    - `fidelity` object — Fidelity for single-qubit (`1q`) and two-qubit (`2q`) gates, and State Preparation and Measurement (`spam`) operations. Currently provides only median fidelity; additional statistical data will be added in the future.
      - `spam` object, required — SPAM error correction information.
        - `median` number, required
        - `stderr` integer — SPAM error.
    - `id` string, uuid — UUID of the characterization.
    - `qubits` integer — The number of qubits available.
    - `timing` object — Time, in seconds, of various system properties: `t1` time, `t2` time, `1q` gate time, `2q` gate time, `readout` time, and qubit `reset` time.
      - `1q` integer
      - `2q` integer
      - `readout` integer, required — Readout time.
      - `reset` integer, required — qubit reset time.
      - `t1` integer
      - `t2` integer
  - `pages` integer — The number of remaining pages of characterization measurements.

---

[API](https://skmtc.net/ionq/apis/ionq-cloud-platform-api.md) · [All operations](https://skmtc.net/ionq/apis/ionq-cloud-platform-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/ionq/ionq-cloud-platform-api/versions/0410071e1cd0/schema)