Qiskit / qiskit / 22965262791

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Commit Message

Add C/Python interop for `Target` and `DAGCircuit` (#15337)

* Add C/Python interop for `Target` and `DAGCircuit`

This adds the ability to retrieve a `QkDag *` from a Python
`DAGCircuit` and a `QkTarget *`from a `Target`.  For `DAGCircuit`, which
is directly the user-facing pyclass, this commit also includes a way of
passing ownership from a `QkDag *` to a Python object.  `QkTarget` does
not yet have a defined converted to full Python space, since that
involves constructing an additional wrapper object, whose structure
might change soon.

Similar functionality can be added to other objects that we expect C
extension modules to be able to return to Python space.  In some cases
(such as `QkTranspileLayout`), the Rust- and Python-space objects are
quite different, so there is no need to specify a converter until we
have unified them in both.  `CircuitData` is in an awkward spot because
while it _does_ have a perfect correspondence with a Python-space
object, that object is not the complete `QuantumCircuit`.

* Update crates/cext/src/dag.rs

Co-authored-by: Raynel Sanchez <87539502+raynelfss@users.noreply.github.com>

* Remove unneeded reference conversion

* Update crates/cext/src/dag.rs

Co-authored-by: Julien Gacon <gaconju@gmail.com>

* Update crates/cext/src/transpiler/target.rs

Co-authored-by: Julien Gacon <gaconju@gmail.com>

* Update releasenotes/notes/c-dag-getter-00bce3ca7de3b19c.yaml

Co-authored-by: Raynel Sanchez <87539502+raynelfss@users.noreply.github.com>

---------

Co-authored-by: Raynel Sanchez <87539502+raynelfss@users.noreply.github.com>
Co-authored-by: Julien Gacon <gaconju@gmail.com>

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