37 lines
1.6 KiB
Plaintext
37 lines
1.6 KiB
Plaintext
---
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title: level_0_pass_manager
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description: API reference for qiskit.transpiler.preset_passmanagers.level_0_pass_manager
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in_page_toc_min_heading_level: 1
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python_api_type: function
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python_api_name: qiskit.transpiler.preset_passmanagers.level_0_pass_manager
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---
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<span id="qiskit-transpiler-preset-passmanagers-level-0-pass-manager" />
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# qiskit.transpiler.preset\_passmanagers.level\_0\_pass\_manager
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<Function id="qiskit.transpiler.preset_passmanagers.level_0_pass_manager" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.24/qiskit/transpiler/preset_passmanagers/level0.py" signature="level_0_pass_manager(pass_manager_config)">
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Level 0 pass manager: no explicit optimization other than mapping to backend.
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This pass manager applies the user-given initial layout. If none is given, a trivial layout consisting of mapping the i-th virtual qubit to the i-th physical qubit is used. Any unused physical qubit is allocated as ancilla space.
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The pass manager then unrolls the circuit to the desired basis, and transforms the circuit to match the coupling map.
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**Parameters**
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**pass\_manager\_config** ([*PassManagerConfig*](qiskit.transpiler.PassManagerConfig "qiskit.transpiler.passmanager_config.PassManagerConfig")) – configuration of the pass manager.
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**Returns**
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a level 0 pass manager.
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**Raises**
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[**TranspilerError**](qiskit.transpiler.TranspilerError "qiskit.transpiler.TranspilerError") – if the passmanager config is invalid.
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**Return type**
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[*StagedPassManager*](qiskit.transpiler.StagedPassManager "qiskit.transpiler.passmanager.StagedPassManager")
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</Function>
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