MCXRecursive¶
- class MCXRecursive(num_ctrl_qubits, label=None, ctrl_state=None)[source]¶
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 the number of required ancilla qubits.
Invert this gate.
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_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.