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Update transpiler docs #12731

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merged 2 commits into from
Jul 8, 2024
Merged

Update transpiler docs #12731

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a68d6a9
Remove DenseLayout from default pipeline
ElePT Jul 8, 2024
8aa77ca
Merge branch 'main' into fix-transpiler-docs
jakelishman Jul 8, 2024
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10 changes: 5 additions & 5 deletions qiskit/transpiler/__init__.py
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Expand Up @@ -650,8 +650,6 @@
.. image:: /source_images/mapping.png




By default, qiskit will do this mapping for you. The choice of mapping depends on the
properties of the circuit, the particular device you are targeting, and the optimization
level that is chosen. The choice of initial layout is extremely important for minimizing the
Expand Down Expand Up @@ -684,10 +682,12 @@
:class:`~.SabreLayout` is used to select a layout if a perfect layout isn't found for
optimization levels 1, 2, and 3.
- :class:`~.TrivialLayout`: Always used for the layout at optimization level 0.

There are other passes than can be used for the heuristic stage, but are not included in the default
pipeline, such as:
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I know this already merged but how does this reconcile with: #12453 which is new in 1.2.0? We're not running the "pass" by default. But we're using the pass internals as part of another one.


- :class:`~.DenseLayout`: Finds the sub-graph of the device with greatest connectivity
that has the same number of qubits as the circuit. Used for
optimization level 1 if there are control flow operations (such as
:class:`~.IfElseOp`) present in the circuit.
that has the same number of qubits as the circuit.

Let's see what layouts are automatically picked at various optimization levels. The circuits
returned by :func:`qiskit.compiler.transpile` are annotated with this initial layout information,
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