Qiskit / qiskit / 20745572695

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Commit Message

Add SparseObservable support to evolved_operator_ansatz (#15442)

* Add SparseObservable support to evolved_operator_ansatz

- Add conditional import and handling for SparseObservable
- Extend Rust fast path to accept SparseObservable (in addition to SparsePauliOp)
- Enhance _is_pauli_identity() to handle SparseObservable with coefficient checks
- Fix edge cases: return empty circuit when all operators filtered, handle string/list parameter_prefix
- Add comprehensive test coverage for SparseObservable support

* Fix import after removing try

* Address PR review comments for SparseObservable support

- Use direct import of SparseObservable (no try-except)
- Simplify identity check: use num_terms == 1 and len(bit_labels()) == 0
- Fix empty circuit handling: return circuit with correct num_qubits when all operators are identities
- Add SparseObservable support to fast Rust path
- Fix prefix handling to support both string and list types
- Add comprehensive test cases for all changes

* Optimize evolved_operator_ansatz and clean up tests

- Move num_operators update inside remove_identities block for optimization
- Return early with empty circuit when all operators are identities
- Remove num_operators > 0 checks since we guarantee it after identity removal
- Replace try-except import pattern with direct SparseObservable import in tests
- Remove test for private _is_pauli_identity function
- Update all test references to use SparseObservable directly

* Update qiskit/circuit/library/n_local/evolved_operator_ansatz.py

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

* Update qiskit/circuit/library/n_local/evolved_operator_ansatz.py

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

* Combined SparseObservable tests into TestEvolvedOperatorAnsatz

* Add release note for SparseObservable support in evolved_operator_ansatz

* Update reno

* Apply black formatting

---------

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

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20 existing lines in 5 files now uncovered.

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