122 lines
5.0 KiB
Plaintext
122 lines
5.0 KiB
Plaintext
---
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title: Unroller
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description: API reference for qiskit.transpiler.passes.Unroller
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in_page_toc_min_heading_level: 1
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python_api_type: class
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python_api_name: qiskit.transpiler.passes.Unroller
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---
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# Unroller
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<Class id="qiskit.transpiler.passes.Unroller" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.46/qiskit/transpiler/passes/basis/unroller.py" signature="qiskit.transpiler.passes.Unroller(*args, **kwargs)" modifiers="class">
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Bases: [`TransformationPass`](qiskit.transpiler.TransformationPass "qiskit.transpiler.basepasses.TransformationPass")
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Unroll a circuit to a given basis.
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Unroll (expand) non-basis, non-opaque instructions recursively to a desired basis, using decomposition rules defined for each instruction.
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Unroller initializer.
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<Admonition title="Deprecated since version 0.45.0" type="danger">
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The class `qiskit.transpiler.passes.basis.unroller.Unroller` is deprecated as of qiskit 0.45.0. It will be removed in the Qiskit 1.0 release. This has been replaced by the BasisTranslator pass.
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</Admonition>
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**Parameters**
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* **basis** ([*list*](https://docs.python.org/3/library/stdtypes.html#list "(in Python v3.12)")*\[*[*str*](https://docs.python.org/3/library/stdtypes.html#str "(in Python v3.12)")*] or None*) – Target basis names to unroll to, e.g. \[‘u3’, ‘cx’] . If None, does not unroll any gate.
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* **target** ([*Target*](qiskit.transpiler.Target "qiskit.transpiler.Target")) – The [`Target`](qiskit.transpiler.Target "qiskit.transpiler.Target") representing the target backend, if both `basis` and this are specified then this argument will take precedence and `basis` will be ignored.
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## Attributes
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### is\_analysis\_pass
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<Attribute id="qiskit.transpiler.passes.Unroller.is_analysis_pass">
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Check if the pass is an analysis pass.
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If the pass is an AnalysisPass, that means that the pass can analyze the DAG and write the results of that analysis in the property set. Modifications on the DAG are not allowed by this kind of pass.
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</Attribute>
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### is\_transformation\_pass
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<Attribute id="qiskit.transpiler.passes.Unroller.is_transformation_pass">
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Check if the pass is a transformation pass.
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If the pass is a TransformationPass, that means that the pass can manipulate the DAG, but cannot modify the property set (but it can be read).
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</Attribute>
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## Methods
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### execute
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<Function id="qiskit.transpiler.passes.Unroller.execute" signature="execute(passmanager_ir, state, callback=None)">
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Execute optimization task for input Qiskit IR.
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**Parameters**
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* **passmanager\_ir** ([*Any*](https://docs.python.org/3/library/typing.html#typing.Any "(in Python v3.12)")) – Qiskit IR to optimize.
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* **state** ([*PassManagerState*](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")) – State associated with workflow execution by the pass manager itself.
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* **callback** ([*Callable*](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.12)") *| None*) – A callback function which is caller per execution of optimization task.
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**Returns**
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Optimized Qiskit IR and state of the workflow.
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**Return type**
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[tuple](https://docs.python.org/3/library/stdtypes.html#tuple "(in Python v3.12)")\[[*Any*](https://docs.python.org/3/library/typing.html#typing.Any "(in Python v3.12)"), [qiskit.passmanager.compilation\_status.PassManagerState](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")]
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</Function>
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### name
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<Function id="qiskit.transpiler.passes.Unroller.name" signature="name()">
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Name of the pass.
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**Return type**
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[str](https://docs.python.org/3/library/stdtypes.html#str "(in Python v3.12)")
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</Function>
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### run
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<Function id="qiskit.transpiler.passes.Unroller.run" signature="run(dag)">
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Run the Unroller pass on dag.
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**Parameters**
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**dag** ([*DAGCircuit*](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit")) – input dag
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**Raises**
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* [**QiskitError**](exceptions#qiskit.exceptions.QiskitError "qiskit.exceptions.QiskitError") – if unable to unroll given the basis due to undefined
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* **decomposition rules**\*\* (****such as a bad basis****) or \*\***excessive recursion.** –
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**Returns**
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output unrolled dag
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**Return type**
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[DAGCircuit](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit")
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</Function>
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### update\_status
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<Function id="qiskit.transpiler.passes.Unroller.update_status" signature="update_status(state, run_state)">
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Update workflow status.
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**Parameters**
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* **state** ([*PassManagerState*](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")) – Pass manager state to update.
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* **run\_state** (*RunState*) – Completion status of current task.
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**Returns**
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Updated pass manager state.
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**Return type**
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[*PassManagerState*](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")
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</Function>
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</Class>
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