MCXGate#

class qiskit.circuit.library.MCXGate(num_ctrl_qubits=None, label=None, ctrl_state=None)[source]#

Bases : ControlledGate

The general, multi-controlled X gate.

Can be applied to a QuantumCircuit with the mcx() method.

Create new MCX gate.

Attributes

condition_bits#: Get Clbits in condition.

ctrl_state#: Return the control state of the gate as a decimal integer.

decompositions#: Get the decompositions of the instruction from the SessionEquivalenceLibrary.

definition#: 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.

duration#: Get the duration.

label#: Return instruction label

name#

Get name of gate. If the gate has open controls the gate name will become:

<original_name_o<ctrl_state>

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.

num_ancilla_qubits#: The number of ancilla qubits.

num_clbits#: Return the number of clbits.

num_ctrl_qubits#

Get number of control qubits.

Renvoie:: The number of control qubits for the gate.
Type renvoyé:: int

num_qubits#: Return the number of qubits.

params#

Get parameters from base_gate.

Renvoie:: List of gate parameters.
Type renvoyé:: list
Lève:: CircuitError – Controlled gate does not define a base gate

unit#: Get the time unit of duration.

Methods

control(num_ctrl_qubits=1, label=None, ctrl_state=None)[source]#

Return a multi-controlled-X gate with more control lines.

Paramètres:

num_ctrl_qubits (int) – number of control qubits.
label (str or None) – An optional label for the gate [Default: None]
ctrl_state (int or str or None) – control state expressed as integer, string (e.g. “110”), or None. If None, use all 1s.

Renvoie:

controlled version of this gate.

Type renvoyé:

ControlledGate

static get_num_ancilla_qubits(num_ctrl_qubits, mode='noancilla')[source]#

Get the number of required ancilla qubits without instantiating the class.

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.

Type renvoyé:: int

inverse()[source]#: Invert this gate. The MCX is its own inverse.