qiskit/releasenotes/notes/0.12/opertor-measures-33682f22a4...

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---
features:
- |
Added :func:`qiskit.quantum_info.average_gate_fidelity` and
:func:`qiskit.quantum_info.gate_error` functions to the
:mod:`qiskit.quantum_info` module for working with
:class:`qiskit.quantum_info.Operator` and ``QuantumChannel``
(e.g., :class:`qiskit.quantum_info.Choi`) objects.
upgrade:
- |
The second argument of the :func:`qiskit.quantum_info.process_fidelity`
function, ``target``, is now optional. If a target unitary is not
specified, then process fidelity of the input channel with the identity
operator will be returned.
deprecations:
- |
The ``require_cptp`` kwarg of the
:func:`qiskit.quantum_info.process_fidelity` function has been
deprecated and will be removed in a future release. It is superseded by
two separate kwargs ``require_cp`` and ``require_tp``.