Construct subclasses of InstructionDurations from backend (#11501)

* Construct InstructionDuration subclass * add reno * Add Sphinx cross-refs --------- Co-authored-by: Jake Lishman <jake.lishman@ibm.com>
Qiskit · Jan 6, 2024 · fbb0938 · fbb0938
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diff --git a/qiskit/transpiler/instruction_durations.py b/qiskit/transpiler/instruction_durations.py
@@ -94,7 +94,7 @@ def from_backend(cls, backend: Backend):
         except AttributeError:
             dt = None
 
-        return InstructionDurations(instruction_durations, dt=dt)
+        return cls(instruction_durations, dt=dt)
 
     def update(self, inst_durations: "InstructionDurationsType" | None, dt: float = None):
         """Update self with inst_durations (inst_durations overwrite self).

diff --git a/releasenotes/notes/instructiondurations-subclass-from-backend-1240cb924f386816.yaml b/releasenotes/notes/instructiondurations-subclass-from-backend-1240cb924f386816.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    :meth:`.InstructionDurations.from_backend` now returns an instance of any subclass 
+    of :class:`.InstructionDurations` instead of the base class.