MCPhaseGate
class MCPhaseGate(lam, num_ctrl_qubits, label=None)
Bases: qiskit.circuit.controlledgate.ControlledGate
Multi-controlled-Phase gate.
This is a diagonal and symmetric gate that induces a phase on the state of the target qubit, depending on the state of the control qubits.
Can be applied to a QuantumCircuit with the mcp() method.
Circuit symbol:
q_0: ───■────
│
.
│
q_(n-1): ───■────
┌──┴───┐
q_n: ┤ P(λ) ├
└──────┘CPhaseGate: The singly-controlled-version of this gate.
Create new MCPhase gate.
Methods Defined Here
control
MCPhaseGate.control(num_ctrl_qubits=1, label=None, ctrl_state=None)
Controlled version of this gate.
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
inverse
MCPhaseGate.inverse()
Return inverted MCU1 gate ()
Attributes
condition_bits
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_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.