qiskit/releasenotes/notes/2.0/default-routing-e63e1bf5a1a...

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---
features_transpiler:
- |
A new :ref:`routing plugin stage <transpiler-preset-stage-routing>` is added, called
``"default"``. In Qiskit 2.0, this is simply an alias for the previous default ``"sabre"``.
The underlying default algorithm may change over the course of the Qiskit 2.x series for some or
all targets, but you can always set ``routing_method="sabre"`` explicitly to maintain
the current behavior.
upgrade_transpiler:
- |
The :ref:`routing plugin stage <transpiler-preset-stage-routing>` name ``default`` is
now reserved for the Qiskit built-in plugin of the same name.
- |
The default :ref:`routing plugin stage <transpiler-preset-stage-routing>` is now
``"default"``. In Qiskit 2.0, this is simply an alias for the previous default ``"sabre"``.
The underlying default algorithm may change over the course of the Qiskit 2.x series for some or
all targets, but you can always set ``routing_method="sabre"`` explicitly to maintain
the current behavior.