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Source code for 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.
"""
PauliTable utility functions.
"""

import numpy as np
from .pauli_table import PauliTable


[docs]def pauli_basis(num_qubits, weight=False): """Return the ordered PauliTable 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) Returns: PauliTable: the PauliTable for the basis """ pauli_1q = PauliTable(np.array([[False, False], [True, False], [True, True], [False, True]], dtype=bool)) 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

© Copyright 2020, Qiskit Development Team. Last updated on 2021/02/18.

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