Qiskit / qiskit / 11690124120

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Commit Message

Add iterator-access methods to `SparseObservable` (#13370)

* Add iterator-access methods to `SparseObservable`

This adds a new related class, `SparseObservable.Term` to be the item
type of the iteration methods, and imbibes it with the simplest
mathematical binary relations with `SparseObservable` as the other
operand.

For some reason, in my head, the methods to convert terms and
observables to their corresponding Pauli basis are related to iteration?
The `SparseObservable.pauli_bases` and
`SparseObservable.Term.pauli_base` methods perform a similar bitwise
trick to do this reduction as exemplified in the documentation, but
return the other `quantum_info`-native classes `PauliList` and `Pauli`,
respectively.  These methods are expected to be used by the primitives.

* Improve documentation

* Return `SparseObservable` from sequence indices

Run Details

236 of 253 new or added lines in 1 file covered. (93.28%)

5 existing lines in 3 files now uncovered.

77020 of 86729 relevant lines covered (88.81%)

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