MCXGate
class MCXGate(num_ctrl_qubits=None, label=None, ctrl_state=None)
Bases: qiskit.circuit.controlledgate.ControlledGate
The general, multi-controlled X gate.
Create new MCX gate.
Methods Defined Here
control
MCXGate.control(num_ctrl_qubits=1, label=None, ctrl_state=None)
Return a multi-controlled-X gate with more control lines.
Parameters
- 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.
Returns
controlled version of this gate.
Return type
get_num_ancilla_qubits
static MCXGate.get_num_ancilla_qubits(num_ctrl_qubits, mode='noancilla')
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.
inverse
MCXGate.inverse()
Invert this gate. The MCX is its own inverse.
Attributes
ctrl_state
Return the control state of the gate as a decimal integer.
Return type
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.
Return type
List
duration
Get the duration.
label
Return instruction label
Return type
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.
Return type
str
num_ancilla_qubits
The number of ancilla qubits.
num_ctrl_qubits
Get number of control qubits.
Returns
The number of control qubits for the gate.
Return type
int
params
Get parameters from base_gate.
Returns
List of gate parameters.
Return type
list
Raises
CircuitError – Controlled gate does not define a base gate
unit
Get the time unit of duration.