mirror of https://github.com/Qiskit/qiskit-aer.git
63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
# This code is part of Qiskit.
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#
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# (C) Copyright IBM 2018, 2021.
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#
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# This code is licensed under the Apache License, Version 2.0. You may
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# obtain a copy of this license in the LICENSE.txt file in the root directory
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# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
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#
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# Any modifications or derivative works of this code must retain this
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# copyright notice, and modified files need to carry a notice indicating
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# that they have been altered from the originals.
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"""
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Simulator instruction to save a SuperOp matrix.
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"""
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from qiskit.circuit import QuantumCircuit
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from .save_data import SaveSingleData
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from ..default_qubits import default_qubits
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class SaveSuperOp(SaveSingleData):
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"""Save a SuperOp matrix."""
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def __init__(self, num_qubits, label="superop", pershot=False):
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"""Create new instruction to save the superop simulator state.
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Args:
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num_qubits (int): the number of qubits for the save instruction.
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label (str): the key for retrieving saved data from results.
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pershot (bool): if True save a list of SuperOp matrices for each shot
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of the simulation [Default: False].
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.. note::
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This save instruction must always be performed on the full width of
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qubits in a circuit, otherwise an exception will be raised during
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simulation.
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"""
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super().__init__("save_superop", num_qubits, label, pershot=pershot)
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def save_superop(self, label="superop", pershot=False):
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"""Save the current state of the superop simulator.
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Args:
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label (str): the key for retrieving saved data from results.
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pershot (bool): if True save a list of SuperOp matrices for each shot
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of the simulation [Default: False].
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Returns:
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QuantumCircuit: with attached instruction.
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.. note::
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This instruction is always defined across all qubits in a circuit.
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"""
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qubits = default_qubits(self)
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instr = SaveSuperOp(len(qubits), label=label, pershot=pershot)
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return self.append(instr, qubits)
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QuantumCircuit.save_superop = save_superop
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