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---
title: t2star_circuits
description: API reference for qiskit.ignis.characterization.t2star_circuits
in_page_toc_min_heading_level: 1
python_api_type: function
python_api_name: qiskit.ignis.characterization.t2star_circuits
---
# qiskit.ignis.characterization.t2star\_circuits
<Function id="qiskit.ignis.characterization.t2star_circuits" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-ignis/tree/stable/0.6/qiskit/ignis/characterization/coherence/circuits.py" signature="t2star_circuits(num_of_gates, gate_time, qubits, nosc=0)">
Generate circuits for T2\* measurement.
Each circuit consists of a Hadamard gate, followed by a sequence of identity gates, a phase gate (with a linear phase), and an additional Hadamard gate.
**Parameters**
* **num\_of\_gates** (`Union`\[`List`\[`int`], `array`]) the number of identity gates in each circuit. Must be in an increasing order.
* **gate\_time** (`float`) time of running a single identity gate.
* **qubits** (`List`\[`int`]) indices of the qubits whose T2\*s are to be measured.
* **nosc** (`int`) number of oscillations to induce using the phase gate
**Return type**
`Tuple`\[`List`\[`QuantumCircuit`], `array`, `float`]
**Returns**
* The generated circuits
* Delay times, i.e., gate\_time multiplied by the numbers in num\_of\_gates
* The induced oscillation frequency
</Function>