Remove pulse defaults for old fake 20q backends

qiskit/providers/fake_provider/backends/almaden/fake_almaden.py

@@ -15,7 +15,7 @@
 """
 
 import os
-from qiskit.providers.fake_provider import fake_pulse_backend, fake_backend
+from qiskit.providers.fake_provider import fake_qasm_backend, fake_backend
 
 
 class FakeAlmadenV2(fake_backend.FakeBackendV2):
@@ -35,11 +35,10 @@ class FakeAlmadenV2(fake_backend.FakeBackendV2):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_almaden.json"
     props_filename = "props_almaden.json"
-    defs_filename = "defs_almaden.json"
     backend_name = "fake_almaden_v2"
 
 
-class FakeAlmaden(fake_pulse_backend.FakePulseBackend):
+class FakeAlmaden(fake_qasm_backend.FakeQasmBackend):
     """A fake Almaden backend.
 
     .. code-block:: text
@@ -56,5 +55,4 @@ class FakeAlmaden(fake_pulse_backend.FakePulseBackend):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_almaden.json"
     props_filename = "props_almaden.json"
-    defs_filename = "defs_almaden.json"
     backend_name = "fake_almaden"

qiskit/providers/fake_provider/backends/johannesburg/fake_johannesburg.py

@@ -15,7 +15,7 @@
 """
 
 import os
-from qiskit.providers.fake_provider import fake_pulse_backend, fake_backend
+from qiskit.providers.fake_provider import fake_qasm_backend, fake_backend
 
 
 class FakeJohannesburgV2(fake_backend.FakeBackendV2):
@@ -35,11 +35,10 @@ class FakeJohannesburgV2(fake_backend.FakeBackendV2):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_johannesburg.json"
     props_filename = "props_johannesburg.json"
-    defs_filename = "defs_johannesburg.json"
     backend_name = "fake_johannesburg_v2"
 
 
-class FakeJohannesburg(fake_pulse_backend.FakePulseBackend):
+class FakeJohannesburg(fake_qasm_backend.FakeQasmBackend):
     """A fake Johannesburg backend.
 
     .. code-block:: text
@@ -56,5 +55,4 @@ class FakeJohannesburg(fake_pulse_backend.FakePulseBackend):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_johannesburg.json"
     props_filename = "props_johannesburg.json"
-    defs_filename = "defs_johannesburg.json"
     backend_name = "fake_johannesburg"

qiskit/providers/fake_provider/backends/singapore/fake_singapore.py

@@ -15,7 +15,7 @@
 """
 
 import os
-from qiskit.providers.fake_provider import fake_pulse_backend, fake_backend
+from qiskit.providers.fake_provider import fake_qasm_backend, fake_backend
 
 
 class FakeSingaporeV2(fake_backend.FakeBackendV2):
@@ -35,11 +35,10 @@ class FakeSingaporeV2(fake_backend.FakeBackendV2):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_singapore.json"
     props_filename = "props_singapore.json"
-    defs_filename = "defs_singapore.json"
     backend_name = "fake_singapore_v2"
 
 
-class FakeSingapore(fake_pulse_backend.FakePulseBackend):
+class FakeSingapore(fake_qasm_backend.FakeQasmBackend):
     """A fake Singapore backend.
 
     .. code-block:: text
@@ -56,5 +55,4 @@ class FakeSingapore(fake_pulse_backend.FakePulseBackend):
     dirname = os.path.dirname(__file__)
     conf_filename = "conf_singapore.json"
     props_filename = "props_singapore.json"
-    defs_filename = "defs_singapore.json"
     backend_name = "fake_singapore"

releasenotes/notes/remove-pulse-defs-old-20q-4ed46085b4a15678.yaml

@@ -0,0 +1,21 @@
+---
+upgrade:
+  - |
+    The fake backend objects :class:`~.FakeJohannesburg`,
+    :class:`~.FakeJohannesburgV2`, :class:`~.FakeAlmaden`,
+    :class:`~.FakeAlmadenV2, :class:`~.FakeSingapore`, and
+    :class:`~.FakeSingaporeV2` no longer contain the pulse defaults payloads.
+    This means for the :class:`~.BackendV1` based classes the
+    :meth:`.BackendV1.defaults` method and pulse simulation via
+    :meth:`.BackendV1.run` is no longer available. For :class:`~.BackendV2`
+    based classes the :attr:`~InstructionProperties.calibration` property for
+    instructions in the :class:`~.Target` is no longer populated. This
+    change was done because these systems had exceedingly large pulse defaults
+    payloads (in total ~50MB) due to using sampled waveforms instead of
+    parameteric pulse definitions. These three payload files took > 50% of the
+    disk space required to install qiskit-terra. When weighed against the
+    potential value of being able to compile with pulse awareness or pulse
+    simulate these retired devices the file size is not worth the cost. If
+    you require to leverage these properties you can leverage an older version
+    of Qiskit and leverage :mod:`~qiskit.qpy` to transfer circuits from
+    older versions of qiskit into the current release.