Quellcode für qiskit.quantum_info.operators.symplectic.pauli_utils

# This code is part of Qiskit.
# (C) Copyright IBM 2017, 2020
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.
PauliList utility functions.

from __future__ import annotations
from qiskit.quantum_info.operators.symplectic.pauli_list import PauliList
from qiskit.utils.deprecation import deprecate_arg

[Doku]@deprecate_arg( "pauli_basis", since="0.22", additional_msg=( "The argument ``pauli_list`` has no effect as the function always returns a PauliList." ), ) def pauli_basis(num_qubits: int, weight: bool = False, pauli_list=None) -> PauliList: """Return the ordered PauliTable or PauliList for the n-qubit Pauli basis. Args: num_qubits (int): number of qubits weight (bool): if True optionally return the basis sorted by Pauli weight rather than lexicographic order (Default: False) pauli_list (bool): [Deprecated] This argument is deprecated and remains for backwards compatability. It has no effect. Returns: PauliList: the Paulis for the basis """ del pauli_list pauli_1q = PauliList(["I", "X", "Y", "Z"]) if num_qubits == 1: return pauli_1q pauli = pauli_1q for _ in range(num_qubits - 1): pauli = pauli_1q.tensor(pauli) if weight: return pauli.sort(weight=True) return pauli