TensoredMeasFitter

class TensoredMeasFitter(results, mit_pattern, substate_labels_list=None, circlabel='')

Bases: object

Measurement correction fitter for a tensored calibration.

Initialize a measurement calibration matrix from the results of running the circuits returned by measurement_calibration_circuits.

Warning

This class is not a public API. The internals are not stable and will likely change. It is used solely for the measurement_error_mitigation_cls kwarg of the QuantumInstance class’s constructor (as a class not an instance). Anything outside of that usage does not have the normal user-facing API stability.

Parameters

• results – the results of running the measurement calibration circuits. If this is None, the user will set calibration matrices later.

• mit_pattern (List[List[int]]) – qubits to perform the measurement correction on, divided to groups according to tensors

• substate_labels_list (Optional[List[List[str]]]) – for each calibration matrix, the labels of its rows and columns. If None, the labels are ordered lexicographically

• circlabel (str) – if the qubits were labeled

Raises

ValueError – if the mit_pattern doesn’t match the substate_labels_list

Methods

add_data	Add measurement calibration data
readout_fidelity	Based on the results, output the readout fidelity, which is the average of the diagonal entries in the calibration matrices.
subset_fitter	Return a fitter object that is a subset of the qubits in the original list.

Attributes

cal_matrices

Return cal_matrices.

filter

Return a measurement filter using the cal matrices.

nqubits

Return _qubit_list_sizes.

substate_labels_list

Return _substate_labels_list.