Remove basicaer

CHANGELOG.md

@@ -13,6 +13,9 @@
 * The test suite no longer runs for Qiskit versions below 0.46.
   [(#536)](https://github.com/PennyLaneAI/pennylane-qiskit/pull/536)
 
+* The ``qiskit.basicaer`` device has been removed because it is not supported for versions of Qiskit above 0.46.
+  [(#546)](https://github.com/PennyLaneAI/pennylane-qiskit/pull/546)
+
 ### Deprecations 👋
 
 ### Documentation 📝

doc/index.rst

@@ -21,10 +21,6 @@ The following devices are available:
     :description: Qiskit's staple simulator with great features such as noise models.
     :link: devices/aer.html
 
-.. title-card::
-    :name: 'qiskit.basicaer'
-    :description: A simplified version of the Aer device, which requires fewer dependencies.
-    :link: devices/basicaer.html
 
 .. title-card::
     :name: 'qiskit.basicsim'
@@ -76,9 +72,9 @@ follows:
 
     dev = qml.device('qiskit.aer', wires=2, backend='unitary_simulator')
 
-PennyLane chooses the ``qasm_simulator`` as the default backend if no backend is specified.
-For more details on the ``qasm_simulator``, including available backend options, see
-`Qiskit Qasm Simulator documentation <https://qiskit.org/ecosystem/aer/stubs/qiskit_aer.QasmSimulator.html>`_.
+PennyLane chooses the ``aer_simulator`` as the default backend if no backend is specified.
+For more details on the ``aer_simulator``, including available backend options, see
+`Qiskit Aer Simulator documentation <https://qiskit.github.io/qiskit-aer/stubs/qiskit_aer.AerSimulator.html#qiskit_aer.AerSimulator.run>`_.
 
 Tutorials
 ~~~~~~~~~
@@ -138,7 +134,6 @@ hardware access.
    :hidden:
 
    devices/aer
-   devices/basicaer
    devices/basicsim
    devices/ibmq
    devices/runtime

doc/requirements.txt

@@ -7,10 +7,10 @@ pennylane==0.34
 pybind11==2.11.1
 pygments==2.17.2
 pygments-github-lexers==0.0.5
-qiskit==0.45.3
-qiskit-aer==0.13.3
-qiskit-ibm-runtime==0.20.0
-qiskit-ibm-provider==0.10.0
+qiskit==1.0.2
+qiskit-aer==0.14.1
+qiskit-ibm-runtime==0.23.0
+qiskit-ibm-provider==0.11.0
 sphinxcontrib-bibtex==2.6.2
 sphinx-automodapi==0.17.0
 pennylane-sphinx-theme

pennylane_qiskit/__init__.py

@@ -15,7 +15,7 @@
 
 from ._version import __version__
 from .aer import AerDevice
-from .basic_aer import BasicAerDevice, BasicSimulatorDevice
+from .basic_sim import BasicSimulatorDevice
 from .ibmq import IBMQDevice
 from .remote import RemoteDevice
 from .converter import load, load_pauli_op, load_qasm, load_qasm_from_file

pennylane_qiskit/basic_sim.py

@@ -0,0 +1,49 @@
+# Copyright 2019 Xanadu Quantum Technologies Inc.
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+This module contains the :class:`~.BasicAerDevice` class, a PennyLane device that allows
+evaluation and differentiation of Qiskit Terra's BasicAer simulator
+using PennyLane.
+"""
+from qiskit.providers.basic_provider import BasicProvider
+from .qiskit_device import QiskitDevice
+
+
+class BasicSimulatorDevice(QiskitDevice):
+    """A PennyLane device for the native Python Qiskit simulator.
+
+    For more information on the ``BasicSimulator`` backend options and transpile options, please visit the
+    `BasicProvider documentation <https://docs.quantum.ibm.com/api/qiskit/providers_basic_provider>`_.
+    These options can be passed to this plugin device as keyword arguments.
+
+    Args:
+        wires (int or Iterable[Number, str]]): Number of subsystems represented by the device,
+            or iterable that contains unique labels for the subsystems as numbers (i.e., ``[-1, 0, 2]``)
+            or strings (``['aux_wire', 'q1', 'q2']``).
+        backend (str): the desired backend
+        shots (int or None): number of circuit evaluations/random samples used
+            to estimate expectation values and variances of observables. For statevector backends,
+            setting to ``None`` results in computing statistics like expectation values and variances analytically.
+    """
+
+    short_name = "qiskit.basicsim"
+
+    analytic_warning_message = (
+        "The plugin does not currently support analytic calculation of expectations, variances "
+        "and probabilities with the BasicProvider backend {}. Such statistics obtained from this "
+        "device are estimates based on samples."
+    )
+
+    def __init__(self, wires, shots=1024, backend="basic_simulator", **kwargs):
+        super().__init__(wires, provider=BasicProvider(), backend=backend, shots=shots, **kwargs)

requirements.txt

@@ -1,44 +1,4 @@
-appdirs==1.4.4
-autograd==1.6.2
-autoray==0.6.8
-cachetools==5.3.3
-certifi==2024.2.2
-cffi==1.16.0
-charset-normalizer==3.3.2
-cryptography==42.0.5
-Cython==3.0.8
-dill==0.3.8
-future==1.0.0
-idna==3.6
-mpmath==1.3.0
-networkx==3.2.1
-ninja==1.11.1.1
-ntlm-auth==1.5.0
-numpy==1.26.4
-orjson==3.9.15
-pbr==6.0.0
-pennylane==0.34
-PennyLane-Lightning==0.34
-ply==3.11
-psutil==5.9.8
-pycparser==2.21
-python-constraint==1.4.0
-python-dateutil==2.8.2
-qiskit==0.45.3
-qiskit-aer==0.13.3
-qiskit-ibm-runtime==0.20.0
-qiskit-ibm-provider==0.10.0
-qiskit-ignis==0.7.1
-qiskit-terra==0.45.3
-requests==2.31.0
-requests-ntlm==1.2.0
-retworkx==0.14.1
-scipy==1.12.0
-semantic-version==2.10.0
-six==1.16.0
-stevedore==5.2.0
-symengine==0.11.0
-sympy==1.12
-toml==0.10.2
-urllib3==2.2.1
-websocket-client==1.7.0
+pennylane>=0.32
+qiskit
+numpy
+sympy

tests/conftest.py

@@ -18,12 +18,10 @@
 import os
 import pytest
 import numpy as np
-import qiskit
 
 import pennylane as qml
-from semantic_version import Version
 from qiskit_ibm_provider import IBMProvider
-from pennylane_qiskit import AerDevice, BasicAerDevice, BasicSimulatorDevice
+from pennylane_qiskit import AerDevice, BasicSimulatorDevice
 
 # pylint: disable=protected-access, unused-argument, redefined-outer-name
 
@@ -40,22 +38,14 @@
 A = np.array([[1.02789352, 1.61296440 - 0.3498192j], [1.61296440 + 0.3498192j, 1.23920938 + 0j]])
 
 
-if Version(qiskit.__version__) < Version("1.0.0"):
-    test_devices = [AerDevice, BasicAerDevice]
-    hw_backends = ["qasm_simulator", "aer_simulator"]
-    state_backends = [
-        "statevector_simulator",
-        "unitary_simulator",
-    ]
-else:
-    test_devices = [AerDevice, BasicSimulatorDevice]
-    hw_backends = ["qasm_simulator", "aer_simulator", "basic_simulator"]
-    state_backends = [
-        "statevector_simulator",
-        "unitary_simulator",
-        "aer_simulator_statevector",
-        "aer_simulator_unitary",
-    ]
+test_devices = [AerDevice, BasicSimulatorDevice]
+hw_backends = ["qasm_simulator", "aer_simulator", "basic_simulator"]
+state_backends = [
+    "statevector_simulator",
+    "unitary_simulator",
+    "aer_simulator_statevector",
+    "aer_simulator_unitary",
+]
 
 
 @pytest.fixture