Qiskit / qiskit / 17301318576

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Commit Message

Transpile C API (#14760)

* Add transpiler C API

This commit adds the initial transpiler C API to Qiskit, it provides a
function for running the transpiler to compile a single circuit for a
provided target. This function is not designed to replace the Python
transpiler and should only be used with circuits defined solely using
the C API. It is backed by the same Rust implementation of the
trnaspiler passes, but when coming from the C/Rust API several
assumptions are made that the circuits only contain the feature set
defined in the C API and the results are only valid when called
with circuits built solely using the C API.

As this function is the initial version of the transpiler in C/Rust
there are still a few limitations beyond just the circuits come from C
and only have the features exposed to C. The first is that multi qubit
unitary synthesis does not exist in C yet, so if you construct any
3 or more qubit UnitaryGates the transpiler will error. Additionally,
there is no scheduling stage yet in the C transpiler yet, so there
are no options for scheduling circuits available. Finally, there is no
pluggability to the transpiler, unlike Python where the preset pass
managers and the transpile() function provide a great deal of
configurability and customization via composing your own passes or
using the plugin interface, these concepts do no exist in the C
transpiler. The limitations will be addressed in future releases,
but this first function is about enabling initial circuit
compilation support from C.

* Add docs files

* Fix routing and level 0

* Fix clippy

* Fix VF2 layout allocation with idle qubits

Co-authored-by: Jake Lishman <jake.lishman@ibm.com>
Co-authored-by: Eli Arbel <46826214+eliarbel@users.noreply.github.com>

* Remove commented out vf2postlayout code

Co-authored-by: Jake Lishman <jake@binhbar.com>

* Run idle qubits test

* Add release note

* Move MinPointState definition outside transpile func and simplify interface

* Apply s... (continued)

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