qiskit/releasenotes/notes/0.17/update-old-backend-defaults...

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---
features:
- |
New fake backend classes are available under ``qiskit.test.mock`. These
included mocked versions of ``ibmq_casablanca``, ``ibmq_sydney``,
``ibmq_mumbai``, ``ibmq_lima``, ``ibmq_belem``, ``ibmq_quito``. As
with the other fake backends, these include snapshots of calibration data
(i.e. ``backend.defaults()``) and error data (i.e. ``backend.properties()``)
taken from the real system, and can be used for local testing, compilation
and simulation.
other:
- |
The snapshots of all the fake/mock backends in ``qiskit.test.mock`` have
been updated to reflect recent device changes. This includes a change in
the :attr:`qiskit.providers.models.QasmBackendConfiguration.basis_gates`
attribute for the the :class:`~qiskit.providers.models.BackendConfiguration`
to ``['cx', 'rz', 'sx', 'x', 'id']``, the addition of a ``readout_length``
property to the qubit properties in the
:class:`~qiskit.providers.models.BackendProperties`, and updating the
:class:`~qiskit.providers.models.PulseDefaults` so that all the mock
backends support parametric pulse based
:class:`~qiskit.pulse.InstructionScheduleMap` instances.