Source code for qiskit_aer.library.save_instructions.save_superop

# This code is part of Qiskit.
#
# (C) Copyright IBM 2018, 2021.
#
# 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.
"""
Simulator instruction to save a SuperOp matrix.
"""

from qiskit.circuit import QuantumCircuit
from .save_data import SaveSingleData
from ..default_qubits import default_qubits


[docs]class SaveSuperOp(SaveSingleData): """Save a SuperOp matrix.""" def __init__(self, num_qubits, label="superop", pershot=False): """Create new instruction to save the superop simulator state. Args: num_qubits (int): the number of qubits for the save instruction. label (str): the key for retrieving saved data from results. pershot (bool): if True save a list of SuperOp matrices for each shot of the simulation [Default: False]. .. note:: This save instruction must always be performed on the full width of qubits in a circuit, otherwise an exception will be raised during simulation. """ super().__init__("save_superop", num_qubits, label, pershot=pershot)
[docs]def save_superop(self, label="superop", pershot=False): """Save the current state of the superop simulator. Args: label (str): the key for retrieving saved data from results. pershot (bool): if True save a list of SuperOp matrices for each shot of the simulation [Default: False]. Returns: QuantumCircuit: with attached instruction. .. note:: This instruction is always defined across all qubits in a circuit. """ qubits = default_qubits(self) instr = SaveSuperOp(len(qubits), label=label, pershot=pershot) return self.append(instr, qubits)
QuantumCircuit.save_superop = save_superop