# MCXGrayCode¶

class MCXGrayCode(num_ctrl_qubits=None, label=None, ctrl_state=None)[source]

Bases : qiskit.circuit.library.standard_gates.x.MCXGate

Implement the multi-controlled X gate using the Gray code.

This delegates the implementation to the MCU1 gate, since $$X = H \cdot U1(\pi) \cdot H$$.

Create new MCX gate.

Methods Defined Here

 inverse Invert this gate.

Attributes

ctrl_state

Return the control state of the gate as a decimal integer.

Type renvoyé

int

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.

Type renvoyé

List

duration

Get the duration.

label

Return instruction label

Type renvoyé

str

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.

Type renvoyé

str

num_ancilla_qubits

The number of ancilla qubits.

num_ctrl_qubits

Get number of control qubits.

Renvoie

The number of control qubits for the gate.

Type renvoyé

int

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.