qiskit.ignis.mitigation.TensoredExpvalMeasMitigator.required_shots

TensoredExpvalMeasMitigator.required_shots(delta, qubits=None)

Return the number of shots required for expectation value estimation.

This is the number of shots required so that $|\langle O \rangle_{est} - \langle O \rangle_{true}| < \delta$ with high probability (at least 2/3) and is given by $4\delta^2 \Gamma^2$ where $\Gamma^2$ is the mitigation_overhead().

Parameters

• delta (float) – Error tolerance for expectation value estimator.

• qubits (Optional[List[int]]) – Optional, qubits being measured for operator expval.

Returns

the required shots.

Return type

int