---
features:
  - |
    Added a new class, :class:`~.AerDensityMatrix`, to the :mod:`qiskit_aer.quantum_info`
    module. This class is used to provide the same interface to the
    upstream :class:`~qiskit.quantum_info.DensityMatrix` class in Qiskit but backed by
    Qiskit Aer's simulation.
