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---
title: LinearFunctionsSynthesis
description: API reference for qiskit.transpiler.passes.LinearFunctionsSynthesis
in_page_toc_min_heading_level: 1
python_api_type: class
python_api_name: qiskit.transpiler.passes.LinearFunctionsSynthesis
---
# LinearFunctionsSynthesis
<Class id="qiskit.transpiler.passes.LinearFunctionsSynthesis" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.45/qiskit/transpiler/passes/synthesis/linear_functions_synthesis.py" signature="qiskit.transpiler.passes.LinearFunctionsSynthesis(*args, **kwargs)" modifiers="class">
Bases: [`HighLevelSynthesis`](qiskit.transpiler.passes.HighLevelSynthesis "qiskit.transpiler.passes.synthesis.high_level_synthesis.HighLevelSynthesis")
DEPRECATED: Synthesize linear functions.
Under the hood, this runs the default high-level synthesis plugin for linear functions.
<Admonition title="Deprecated since version 0.23.0" type="danger">
The class `qiskit.transpiler.passes.synthesis.linear_functions_synthesis.LinearFunctionsSynthesis` is deprecated as of qiskit-terra 0.23.0. It will be removed no earlier than 3 months after the release date. Instead, use [`HighLevelSynthesis`](qiskit.transpiler.passes.HighLevelSynthesis "qiskit.transpiler.passes.HighLevelSynthesis").
</Admonition>
## Attributes
### is\_analysis\_pass
<Attribute id="qiskit.transpiler.passes.LinearFunctionsSynthesis.is_analysis_pass">
Check if the pass is an analysis pass.
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.
</Attribute>
### is\_transformation\_pass
<Attribute id="qiskit.transpiler.passes.LinearFunctionsSynthesis.is_transformation_pass">
Check if the pass is a transformation pass.
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).
</Attribute>
## Methods
### execute
<Function id="qiskit.transpiler.passes.LinearFunctionsSynthesis.execute" signature="execute(passmanager_ir, state, callback=None)">
Execute optimization task for input Qiskit IR.
**Parameters**
* **passmanager\_ir** ([*Any*](https://docs.python.org/3/library/typing.html#typing.Any "(in Python v3.12)")) Qiskit IR to optimize.
* **state** ([*PassManagerState*](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")) State associated with workflow execution by the pass manager itself.
* **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.
**Returns**
Optimized Qiskit IR and state of the workflow.
**Return type**
[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")]
</Function>
### name
<Function id="qiskit.transpiler.passes.LinearFunctionsSynthesis.name" signature="name()">
Name of the pass.
**Return type**
[str](https://docs.python.org/3/library/stdtypes.html#str "(in Python v3.12)")
</Function>
### run
<Function id="qiskit.transpiler.passes.LinearFunctionsSynthesis.run" signature="run(dag)">
Run the HighLevelSynthesis pass on dag.
**Parameters**
**dag** ([*DAGCircuit*](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.dagcircuit.DAGCircuit")) input dag.
**Returns**
Output dag with higher-level operations synthesized.
**Raises**
* [**TranspilerError**](transpiler#qiskit.transpiler.TranspilerError "qiskit.transpiler.TranspilerError") when the transpiler is unable to synthesize the given DAG
* **(****for instance****, ****when the specified synthesis method is not available****)\*\*\*\*.**
**Return type**
[*DAGCircuit*](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.dagcircuit.DAGCircuit")
</Function>
### update\_status
<Function id="qiskit.transpiler.passes.LinearFunctionsSynthesis.update_status" signature="update_status(state, run_state)">
Update workflow status.
**Parameters**
* **state** ([*PassManagerState*](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")) Pass manager state to update.
* **run\_state** (*RunState*) Completion status of current task.
**Returns**
Updated pass manager state.
**Return type**
[*PassManagerState*](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")
</Function>
</Class>