MCXVChain
class qiskit.circuit.library.MCXVChain(num_ctrl_qubits=None, dirty_ancillas=False, label=None, ctrl_state=None)
Bases: MCXGate
Implement the multi-controlled X gate using a V-chain of CX gates.
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
num_qubits
Return the number of qubits.
params
Get parameters from base_gate.
Returns
List of gate parameters.
Return type
Raises
CircuitError – Controlled gate does not define a base gate
unit
Get the time unit of duration.
Methods
get_num_ancilla_qubits
static get_num_ancilla_qubits(num_ctrl_qubits, mode='v-chain')
Get the number of required ancilla qubits.
inverse
inverse()
Invert this gate. The MCX is its own inverse.