MCXRecursive
class MCXRecursive(num_ctrl_qubits, label=None, ctrl_state=None)
Bases: qiskit.circuit.library.standard_gates.x.MCXGate
Implement the multi-controlled X gate using recursion.
Using a single ancilla qubit, the multi-controlled X gate is recursively split onto four sub-registers. This is done until we reach the 3- or 4-controlled X gate since for these we have a concrete implementation that do not require ancillas.
Create new MCX gate.
Methods Defined Here
get_num_ancilla_qubits
static MCXRecursive.get_num_ancilla_qubits(num_ctrl_qubits, mode='recursion')
Get the number of required ancilla qubits.
inverse
MCXRecursive.inverse()
Invert this gate. The MCX is its own inverse.
Attributes
condition_bits
Get Clbits in condition.
Return type
List[Clbit]
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_clbits
Return the number of clbits.
num_ctrl_qubits
Get number of control qubits.
Returns
The number of control qubits for the gate.
Return type
int
num_qubits
Return the number of qubits.
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.