165 lines
5.1 KiB
Plaintext
165 lines
5.1 KiB
Plaintext
---
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title: MCXGate
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description: API reference for qiskit.circuit.library.MCXGate
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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.circuit.library.MCXGate
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---
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# MCXGate
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<Class id="qiskit.circuit.library.MCXGate" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.25/qiskit/circuit/library/standard_gates/x.py" signature="qiskit.circuit.library.MCXGate(num_ctrl_qubits=None, label=None, ctrl_state=None)" modifiers="class">
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Bases: [`ControlledGate`](qiskit.circuit.ControlledGate "qiskit.circuit.controlledgate.ControlledGate")
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The general, multi-controlled X gate.
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Can be applied to a [`QuantumCircuit`](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit") with the [`mcx()`](qiskit.circuit.QuantumCircuit#mcx "qiskit.circuit.QuantumCircuit.mcx") method.
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Create new MCX gate.
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## Attributes
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### condition\_bits
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<Attribute id="qiskit.circuit.library.MCXGate.condition_bits">
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Get Clbits in condition.
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</Attribute>
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### ctrl\_state
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<Attribute id="qiskit.circuit.library.MCXGate.ctrl_state">
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Return the control state of the gate as a decimal integer.
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</Attribute>
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### decompositions
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<Attribute id="qiskit.circuit.library.MCXGate.decompositions">
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Get the decompositions of the instruction from the SessionEquivalenceLibrary.
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</Attribute>
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### definition
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<Attribute id="qiskit.circuit.library.MCXGate.definition">
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Return definition in terms of other basic gates. If the gate has open controls, as determined from self.ctrl\_state, the returned definition is conjugated with X without changing the internal \_definition.
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</Attribute>
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### duration
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<Attribute id="qiskit.circuit.library.MCXGate.duration">
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Get the duration.
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</Attribute>
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### label
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<Attribute id="qiskit.circuit.library.MCXGate.label">
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Return instruction label
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</Attribute>
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### name
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<Attribute id="qiskit.circuit.library.MCXGate.name">
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Get name of gate. If the gate has open controls the gate name will become:
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> \<original\_name\_o\<ctrl\_state>
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where \<original\_name> is the gate name for the default case of closed control qubits and \<ctrl\_state> is the integer value of the control state for the gate.
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</Attribute>
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### num\_ancilla\_qubits
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<Attribute id="qiskit.circuit.library.MCXGate.num_ancilla_qubits">
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The number of ancilla qubits.
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</Attribute>
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### num\_clbits
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<Attribute id="qiskit.circuit.library.MCXGate.num_clbits">
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Return the number of clbits.
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</Attribute>
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### num\_ctrl\_qubits
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<Attribute id="qiskit.circuit.library.MCXGate.num_ctrl_qubits">
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Get number of control qubits.
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**Returns**
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The number of control qubits for the gate.
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**Return type**
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[int](https://docs.python.org/3/library/functions.html#int "(in Python v3.12)")
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</Attribute>
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### num\_qubits
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<Attribute id="qiskit.circuit.library.MCXGate.num_qubits">
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Return the number of qubits.
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</Attribute>
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### params
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<Attribute id="qiskit.circuit.library.MCXGate.params">
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Get parameters from base\_gate.
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**Returns**
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List of gate parameters.
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**Return type**
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[list](https://docs.python.org/3/library/stdtypes.html#list "(in Python v3.12)")
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**Raises**
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[**CircuitError**](circuit#qiskit.circuit.CircuitError "qiskit.circuit.CircuitError") – Controlled gate does not define a base gate
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</Attribute>
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### unit
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<Attribute id="qiskit.circuit.library.MCXGate.unit">
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Get the time unit of duration.
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</Attribute>
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## Methods
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### control
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<Function id="qiskit.circuit.library.MCXGate.control" signature="control(num_ctrl_qubits=1, label=None, ctrl_state=None)">
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Return a multi-controlled-X gate with more control lines.
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**Parameters**
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* **num\_ctrl\_qubits** ([*int*](https://docs.python.org/3/library/functions.html#int "(in Python v3.12)")) – number of control qubits.
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* **label** ([*str*](https://docs.python.org/3/library/stdtypes.html#str "(in Python v3.12)") *or None*) – An optional label for the gate \[Default: None]
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* **ctrl\_state** ([*int*](https://docs.python.org/3/library/functions.html#int "(in Python v3.12)") *or*[*str*](https://docs.python.org/3/library/stdtypes.html#str "(in Python v3.12)") *or None*) – control state expressed as integer, string (e.g. ‘110’), or None. If None, use all 1s.
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**Returns**
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controlled version of this gate.
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**Return type**
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[ControlledGate](qiskit.circuit.ControlledGate "qiskit.circuit.ControlledGate")
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</Function>
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### get\_num\_ancilla\_qubits
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<Function id="qiskit.circuit.library.MCXGate.get_num_ancilla_qubits" signature="get_num_ancilla_qubits(num_ctrl_qubits, mode='noancilla')" modifiers="static">
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Get the number of required ancilla qubits without instantiating the class.
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This staticmethod might be necessary to check the number of ancillas before creating the gate, or to use the number of ancillas in the initialization.
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**Return type**
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[int](https://docs.python.org/3/library/functions.html#int "(in Python v3.12)")
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</Function>
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### inverse
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<Function id="qiskit.circuit.library.MCXGate.inverse" signature="inverse()">
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Invert this gate. The MCX is its own inverse.
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</Function>
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</Class>
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