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GET
/
backends
/
{backend}
/
characterizations
cURL
curl "https://api.ionq.co/v0.4/backends/qpu.aria-1/characterizations"
{
  "characterizations": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "date": "2025-06-16T00:00:00Z",
      "backend": "qpu.aria-1",
      "qubits": 25,
      "connectivity": [
        [
          0,
          1
        ],
        [
          0,
          2
        ],
        [
          10,
          9
        ]
      ],
      "fidelity": {
        "spam": {
          "median": 0.9962,
          "stderr": null
        }
      },
      "timing": {
        "readout": 123,
        "reset": 123,
        "1q": 123,
        "2q": 123,
        "t1": 10,
        "t2": 1
      }
    }
  ],
  "pages": 123
}
Retrieve historical performance characterizations for a specific backend with optional date filtering and pagination. Characterizations provide snapshots of quantum hardware performance including fidelity measurements and gate operation speeds over time. Learn more about backend characterizations.

Path Parameters

​
backend
enum<string>
required

A backend where jobs can run on.

Available options:
qpu.aria-1,
qpu.aria-2,
qpu.forte-1,
qpu.forte-enterprise-1

Query Parameters

​
start
string

Characterizations starting at this time (e.g., start=2025-12-31)

​
end
string

Characterizations before this time (e.g., end=2025-12-31)

​
limit
integer
default:10

How many objects to return.

Required range: 1 <= x <= 10
​
page
integer
default:1

Specify the page of results to return.

Required range: x >= 1

Response

200 - application/json

Successfully retrieved characterizations.

Response body from requesting characterization data.

​
characterizations
object[]
required

A page of characterizations measurements.

​
pages
integer

The number of remaining pages of characterization measurements.