---
title: MCXSynthesisNoAuxV24 (v1.3)
description: API reference for qiskit.transpiler.passes.synthesis.hls_plugins.MCXSynthesisNoAuxV24 in qiskit v1.3
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit/1.3/qiskit.transpiler.passes.synthesis.hls_plugins.MCXSynthesisNoAuxV24
---

# MCXSynthesisNoAuxV24

*class* `qiskit.transpiler.passes.synthesis.hls_plugins.MCXSynthesisNoAuxV24`

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.3/qiskit/transpiler/passes/synthesis/hls_plugins.py#L1104-L1136)

Bases: [`HighLevelSynthesisPlugin`](/docs/api/qiskit/1.3/qiskit.transpiler.passes.synthesis.plugin.HighLevelSynthesisPlugin "qiskit.transpiler.passes.synthesis.plugin.HighLevelSynthesisPlugin")

Synthesis plugin for a multi-controlled X gate based on the implementation for MCPhaseGate, which is in turn based on the paper by Vale et al. (2024).

See \[1] for details.

This plugin name is :`mcx.noaux_v24` which can be used as the key on an [`HLSConfig`](/docs/api/qiskit/1.3/qiskit.transpiler.passes.HLSConfig "qiskit.transpiler.passes.HLSConfig") object to use this method with [`HighLevelSynthesis`](/docs/api/qiskit/1.3/qiskit.transpiler.passes.HighLevelSynthesis "qiskit.transpiler.passes.HighLevelSynthesis").

For a multi-controlled X gate with $k$ control qubits this synthesis method requires no additional clean auxiliary qubits. The synthesized circuit consists of $k + 1$ qubits.

**References**

1. Vale et. al., *Circuit Decomposition of Multicontrolled Special Unitary Single-Qubit Gates*, IEEE TCAD 43(3) (2024), [arXiv:2302.06377](https://arxiv.org/abs/2302.06377)

## Methods

### run

`run(high_level_object, coupling_map=None, target=None, qubits=None, **options)`

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.3/qiskit/transpiler/passes/synthesis/hls_plugins.py#L1124-L1136)

Run synthesis for the given MCX gate.