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GET
/
backends
/
{backend}
/
characterizations
/
{UUID}
cURL
curl "https://api.ionq.co/v0.4/backends/qpu.aria-1/characterizations/aa54e783-0a9b-4f73-ad2f-63983b6aa4a8" \
  -H "Authorization: apiKey your-api-key"
{
  "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
  }
}
Retrieve detailed performance data for a specific characterization of a backend. This includes comprehensive fidelity metrics, gate error rates, and timing information that can help you understand the quantum hardware’s performance at a particular point in time. Learn more about interpreting characterization data.

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
​
UUID
string<uuid>
required

A UUID identifying a specific resource

Response

200 - application/json

Successfully retrieved current characterization

Quantum hardware characterization data.

​
id
string<uuid>

UUID of the characterization.

​
date
string

Date time of the measurement, in ISO format.

Example:

"2025-06-16T00:00:00Z"

​
backend
enum<string>

The backend calibrated hardware.

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

The number of qubits available.

Required range: x >= 1
Example:

25

​
connectivity
integer[][]

An array of valid, unordered tuples of possible qubits for executing two-qubit gates (e.g., [[0, 1], [0, 2], [1, 2]])

Example:
[[0, 1], [0, 2], [10, 9]]
​
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.

​
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.