CPhaseGate#

class qiskit.circuit.library.CPhaseGate(theta, label=None, ctrl_state=None)[fuente]#

Bases: ControlledGate

Controlled-Phase gate.

This is a diagonal and symmetric gate that induces a phase on the state of the target qubit, depending on the control state.

Can be applied to a QuantumCircuit with the cp() method.

Circuit symbol:

q_0: ─■──
      │λ
q_1: ─■──

Matrix representation:

\[\begin{split}CPhase = I \otimes |0\rangle\langle 0| + P \otimes |1\rangle\langle 1| = \begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & e^{i\lambda} \end{pmatrix}\end{split}\]

Ver también

CRZGate: Due to the global phase difference in the matrix definitions of Phase and RZ, CPhase and CRZ are different gates with a relative phase difference.

Create new CPhase 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_clbits#: Return the number of clbits.

num_ctrl_qubits#

Get number of control qubits.

Devuelve:: The number of control qubits for the gate.
Tipo del valor devuelto:: int

num_qubits#: Return the number of qubits.

params#

Get parameters from base_gate.

Devuelve:: List of gate parameters.
Tipo del valor devuelto:: list
Muestra:: CircuitError – Controlled gate does not define a base gate

unit#: Get the time unit of duration.

Methods

control(num_ctrl_qubits=1, label=None, ctrl_state=None)[fuente]#

Controlled version of this gate.

Parámetros:

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.

Devuelve:

controlled version of this gate.

Tipo del valor devuelto:

ControlledGate

inverse()[fuente]#: Return inverted CPhase gate (\(CPhase(\lambda)^{\dagger} = CPhase(-\lambda)\))

power(exponent)[fuente]#

Raise gate to a power.