Added release note and docstring

qiskit-community · Apr 9, 2024 · 1adb67f · 1adb67f
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diff --git a/qiskit_dynamics/backend/dynamics_backend.py b/qiskit_dynamics/backend/dynamics_backend.py
@@ -361,7 +361,8 @@ def solve(
         ``y0`` is not specified, it will be set from ``self.options.initial_state``.
 
         Args:
-            t_span: Time interval to integrate over.
+            t_span: Time interval to integrate over. Defaults to ``None``, in which case the
+                    interval is set to [[0, input.duration] for input in solve_input]].
             y0: Initial state.
             solve_input: Time evolution of the system in terms of quantum circuits or qiskit
                          pulse schedules.

diff --git a/releasenotes/notes/default_tspan_backend_solve-b1ad23f6ea291474.yaml b/releasenotes/notes/default_tspan_backend_solve-b1ad23f6ea291474.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - `DynamicsBackend.solve()` method can now work without specifying a t_span argument. 
+    The default t_span is set to be [0, solve_input.duration] for each provided solve_input.
+    This allows users to solve the dynamics of a quantum circuit without having to specify its
+    duration in advance.