qiskit/releasenotes/notes/2.0/sparseobservable-compose-8e...

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---
features_quantum_info:
- |
:class:`.SparseObservable` now supports operator composition using the
:meth:`~.SparseObservable.compose` method, similar to other :mod:`.quantum_info` classes.
This is analagous to matrix multiplication, though the method is entirely matrix free.
- |
:class:`.SparseObservable.BitTerm` as a new attribute, :attr:`~.SparseObservable.BitTerm.label`,
which contains the single-character Python string used to represent the term in string labels.