qiskit/releasenotes/notes/0.20/add-v2-mocked-backend-4ca2e...

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---
features:
- |
Added new fake backend classes from snapshots of the IBM Quantum systems
based on the :class:`~.BackendV2` interface and provided a
:class:`~qiskit.transpiler.Target` for each backend. :class:`~.BackendV2`
based versions of all the existing backends are added except for three old
backends ``FakeRueschlikon``, ``FakeTenerife`` and ``FakeTokyo`` as they
do not have snapshots files available which are required for creating
a new fake backend class based on :class:`~.BackendV2`.
These new V2 fake backends will enable testing and development of new
features introduced by :class:`~qiskit.providers.backend.BackendV2` and
:class:`~qiskit.transpiler.Target` such as improving the transpiler.