qiskit.ignis.characterization.t2star_circuits

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