qiskit.quantum_info.PauliList.unique¶

PauliList.unique(return_index=False, return_counts=False)[source]¶

Return unique Paulis from the table.

Example

from qiskit.quantum_info.operators import PauliList

pt = PauliList(['X', 'Y', '-X', 'I', 'I', 'Z', 'X', 'iZ'])
unique = pt.unique()
print(unique)

['X', 'Y', '-X', 'I', 'Z', 'iZ']

Parameters

return_index (bool) – If True, also return the indices that result in the unique array. (Default: False)
return_counts (bool) – If True, also return the number of times each unique item appears in the table.

Returns

unique: the table of the unique rows.
unique_indices: np.ndarray, optional: The indices of the first occurrences of the unique values in the original array. Only provided if return_index is True.
unique_counts: np.array, optional: The number of times each of the unique values comes up in the original array. Only provided if return_counts is True.

Return type

PauliList