mirror of https://github.com/Qiskit/qiskit.git
42 lines
1.8 KiB
YAML
42 lines
1.8 KiB
YAML
---
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deprecations:
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``PulseChannelSpec`` is being deprecated. Use ``BackendConfiguration``
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instead. The backend configuration is accessed normally as
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``backend.configuration()``. The config has been extended with most of
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the functionality of PulseChannelSpec, with some modifications as follows,
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where `0` is an exemplary qubit index::
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pulse_spec.drives[0] -> config.drive(0)
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pulse_spec.measures[0] -> config.measure(0)
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pulse_spec.acquires[0] -> config.acquire(0)
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pulse_spec.controls[0] -> config.control(0)
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Now, if there is an attempt to get a channel for a qubit which does not
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exist for the device, a ``BackendConfigurationError`` will be raised with
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a helpful explanation.
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The methods ``memoryslots`` and ``registerslots`` of the PulseChannelSpec
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have not been migrated to the backend configuration. These classical
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resources are not restrained by the physical configuration of a backend
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system. Please instantiate them directly::
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pulse_spec.memoryslots[0] -> MemorySlot(0)
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pulse_spec.registerslots[0] -> RegisterSlot(0)
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The ``qubits`` method is not migrated to backend configuration. The result
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of ``qubits`` can be built as such::
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[q for q in range(backend.configuration().n_qubits)]
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- |
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``Qubit`` within ``pulse.channels`` has been deprecated. They should not
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be used. It is possible to obtain channel <=> qubit mappings through the
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BackendConfiguration (or backend.configuration()).
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upgrade:
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The ``qiskit.pulse.channels.SystemTopology`` class was used as a helper
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class for ``PulseChannelSpec``. It has been removed since with the deprecation
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of ``PulseChannelSpec`` and changes to ``BackendConfiguration`` make it
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unnecessary.
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