Add license blurbs

circuit_knitting/cutting/cut_finding/best_first_search.py

@@ -1,4 +1,16 @@
-"""File containing the classes required to implement Dijkstra's (best-first) search algorithm."""
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
+"""Classes required to implement Dijkstra's (best-first) search algorithm."""
+
 import heapq
 import numpy as np
 from itertools import count

circuit_knitting/cutting/cut_finding/circuit_interface.py

@@ -1,5 +1,16 @@
-"""File containing the classes required to represent quantum circuits in a format
- native to the circuit cutting optimizer."""
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
+"""Quantum circuit representation compatible with cut-finding optimizers."""
+
 import copy
 import string
 import numpy as np

circuit_knitting/cutting/cut_finding/cut_finding.py

@@ -1,6 +1,6 @@
 # This code is a Qiskit project.
 
-# (C) Copyright IBM 2023.
+# (C) Copyright IBM 2024.
 
 # 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

circuit_knitting/cutting/cut_finding/cut_optimization.py

@@ -1,4 +1,16 @@
-""" File containing the classes required to search for optimal cut locations."""
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
+"""Classes required to search for optimal cut locations."""
+
 import numpy as np
 from .utils import selectSearchEngine, greedyBestFirstSearch
 from .cutting_actions import disjoint_subcircuit_actions

circuit_knitting/cutting/cut_finding/cutting_actions.py

@@ -1,9 +1,21 @@
-""" File containing classes needed to implement the actions involved in circuit cutting."""
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
+"""Classes needed to implement the actions involved in circuit cutting."""
+
 import numpy as np
 from abc import ABC, abstractmethod
 from .search_space_generator import ActionNames
 
-### This is an object that holds action names for constructing disjoint subcircuits
+# Object that holds action names for constructing disjoint subcircuits
 disjoint_subcircuit_actions = ActionNames()
 
 

circuit_knitting/cutting/cut_finding/disjoint_subcircuits_state.py

@@ -1,4 +1,16 @@
-"""File containing the class needed for representing search-space states when cutting circuits."""
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
+"""Class needed for representing search-space states when cutting circuits."""
+
 import copy
 import numpy as np
 from collections import Counter, namedtuple

circuit_knitting/cutting/cut_finding/lo_cuts_optimizer.py

@@ -1,4 +1,16 @@
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
 """File containing the wrapper class for optimizing LO gate and wire cuts."""
+
 from .cut_optimization import CutOptimization
 from .cut_optimization import disjoint_subcircuit_actions
 from .cut_optimization import CutOptimizationNextStateFunc

circuit_knitting/cutting/cut_finding/optimization_settings.py

@@ -1,4 +1,15 @@
-"""File containing class for specifying parameters that control the optimization."""
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
+"""Class for specifying parameters that control the optimization."""
 
 
 class OptimizationSettings:

circuit_knitting/cutting/cut_finding/quantum_device_constraints.py

@@ -1,4 +1,15 @@
-"""File containing the class used for specifying characteristics of the target QPU."""
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
+"""Class used for specifying characteristics of the target QPU."""
 
 
 class DeviceConstraints:

circuit_knitting/cutting/cut_finding/search_space_generator.py

@@ -1,4 +1,15 @@
-"""File containing the classes needed to generate and explore a search space."""
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
+"""Classes needed to generate and explore a search space."""
 
 
 class ActionNames:

circuit_knitting/cutting/cut_finding/utils.py

@@ -1,4 +1,16 @@
-"""File containing helper functions that are used in the code."""
+# This code is a Qiskit project.
+
+# (C) Copyright IBM 2024.
+
+# 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.
+
+"""Helper functions that are used in the code."""
+
 from qiskit import QuantumCircuit
 from qiskit.circuit import Instruction
 from .best_first_search import BestFirstSearch