mirror of https://github.com/Qiskit/qiskit-aer.git
64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
# 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 unitary matrix.
|
|
"""
|
|
|
|
from qiskit.circuit import QuantumCircuit
|
|
from .save_data import SaveSingleData
|
|
from ..default_qubits import default_qubits
|
|
|
|
|
|
class SaveUnitary(SaveSingleData):
|
|
"""Save Unitary"""
|
|
|
|
def __init__(self, num_qubits, label="unitary", pershot=False):
|
|
"""Create new instruction to save the unitary simulator state.
|
|
|
|
Args:
|
|
num_qubits (int): the number of qubits of the
|
|
label (str): the key for retrieving saved data from results.
|
|
pershot (bool): if True save a list of unitaries for each
|
|
shot of the simulation rather than a single
|
|
statevector [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_unitary", num_qubits, label, pershot=pershot)
|
|
|
|
|
|
def save_unitary(self, label="unitary", pershot=False):
|
|
"""Save the current state of the unitary simulator.
|
|
|
|
Args:
|
|
label (str): the key for retrieving saved data from results.
|
|
pershot (bool): if True save a list of unitaries 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 = SaveUnitary(len(qubits), label=label, pershot=pershot)
|
|
return self.append(instr, qubits)
|
|
|
|
|
|
QuantumCircuit.save_unitary = save_unitary
|