Deprecation 0.45 extensions

qiskit/extensions/__init__.py

@@ -50,7 +50,6 @@
 from qiskit.circuit.library.generalized_gates import UnitaryGate
 from qiskit.circuit.barrier import Barrier
 
-from .exceptions import ExtensionError
 from .quantum_initializer import (
     Initialize,
     SingleQubitUnitary,
@@ -59,7 +58,6 @@
     UCRYGate,
     UCRZGate,
 )
-from .simulator import Snapshot
 
 
 warnings.warn(

qiskit/extensions/simulator/__init__.py

@@ -11,5 +11,3 @@
 # that they have been altered from the originals.
 
 """Instructions usable by simulator backends."""
-
-from .snapshot import Snapshot

releasenotes/notes/remove-deprecated-extensions-fca165125c534de5.yaml

@@ -0,0 +1,11 @@
+---
+upgrade:
+  - |
+    Remove features deprecated in 0.45 for `qiskit/extensions`:
+
+      * `exceptions`, No alternative will be provided
+      * `squ`,        Instead, use QuantumCircuit unitary
+      * `snapshot`,  
+
+    The Snapshot instruction has been superseded by Qiskit Aer's save instructions, 
+    see: https://qiskit.org/ecosystem/aer/apidocs/aer_library.html#saving-simulator-data

test/python/circuit/test_circuit_properties.py

@@ -14,12 +14,12 @@
 
 import unittest
 import numpy as np
+from qiskit_aer.library import SaveState
 from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit, pulse
 from qiskit.circuit import Clbit
 from qiskit.circuit.library import RXGate, RYGate
 from qiskit.test import QiskitTestCase
 from qiskit.circuit.exceptions import CircuitError
-from qiskit.extensions.simulator import Snapshot
 
 
 class TestCircuitProperties(QiskitTestCase):
@@ -578,8 +578,8 @@ def test_circuit_depth_snap1(self):
         circ = QuantumCircuit(q, c)
         circ.h(0)
         circ.cx(0, 1)
-        with self.assertWarns(DeprecationWarning):
-            circ.append(Snapshot("snap", num_qubits=4), [0, 1, 2, 3])
+        circ.append(SaveState(4, "snap"), [0, 1, 2, 3])
+
         circ.h(2)
         circ.cx(2, 3)
         self.assertEqual(circ.depth(), 4)
@@ -600,14 +600,11 @@ def test_circuit_depth_snap2(self):
         c = ClassicalRegister(4, "c")
         circ = QuantumCircuit(q, c)
         circ.h(0)
-        with self.assertWarns(DeprecationWarning):
-            circ.append(Snapshot("snap0", num_qubits=4), [0, 1, 2, 3])
+        circ.append(SaveState(4, "snap0"), [0, 1, 2, 3])
         circ.cx(0, 1)
-        with self.assertWarns(DeprecationWarning):
-            circ.append(Snapshot("snap1", num_qubits=4), [0, 1, 2, 3])
+        circ.append(SaveState(4, "snap1"), [0, 1, 2, 3])
         circ.h(2)
-        with self.assertWarns(DeprecationWarning):
-            circ.append(Snapshot("snap2", num_qubits=4), [0, 1, 2, 3])
+        circ.append(SaveState(4, "snap3"), [0, 1, 2, 3])
         circ.cx(2, 3)
         self.assertEqual(circ.depth(), 4)
 
@@ -628,9 +625,8 @@ def test_circuit_depth_snap3(self):
         circ = QuantumCircuit(q, c)
         circ.h(0)
         circ.cx(0, 1)
-        with self.assertWarns(DeprecationWarning):
-            circ.append(Snapshot("snap0", num_qubits=4), [0, 1, 2, 3])
-            circ.append(Snapshot("snap1", num_qubits=4), [0, 1, 2, 3])
+        circ.append(SaveState(4, "snap0"), [0, 1, 2, 3])
+        circ.append(SaveState(4, "snap1"), [0, 1, 2, 3])
         circ.h(2)
         circ.cx(2, 3)
         self.assertEqual(circ.depth(), 4)
@@ -756,8 +752,7 @@ def test_circuit_size_ignores_barriers_snapshots(self):
         self.assertEqual(qc.size(), 2)
         qc.barrier(q)
         self.assertEqual(qc.size(), 2)
-        with self.assertWarns(DeprecationWarning):
-            qc.append(Snapshot("snapshot_label", num_qubits=4), [0, 1, 2, 3])
+        qc.append(SaveState(4, "snapshot_label"), [0, 1, 2, 3])
         self.assertEqual(qc.size(), 2)
 
     def test_circuit_count_ops(self):

test/python/transpiler/test_unroller.py

@@ -15,8 +15,8 @@
 
 from numpy import pi
 
+from qiskit_aer.library import SaveState
 from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit
-from qiskit.extensions.simulator import Snapshot
 from qiskit.transpiler.passes import Unroller
 from qiskit.converters import circuit_to_dag, dag_to_circuit
 from qiskit.quantum_info import Operator
@@ -777,8 +777,7 @@ def test_unroll_z(self):
     def test_unroll_snapshot(self):
         """test unroll snapshot"""
         num_qubits = self.circuit.num_qubits
-        with self.assertWarns(DeprecationWarning):
-            instr = Snapshot("0", num_qubits=num_qubits)
+        instr = SaveState(num_qubits, "0")
         self.circuit.append(instr, range(num_qubits))
         self.ref_circuit.append(instr, range(num_qubits))
         self.compare_dags()