YGate#

class qiskit.circuit.library.YGate(label=None)[ソース]#

ベースクラス: Gate

The single-qubit Pauli-Y gate (\(\sigma_y\)).

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

Matrix Representation:

\[\begin{split}Y = \begin{pmatrix} 0 & -i \\ i & 0 \end{pmatrix}\end{split}\]

Circuit symbol:

     ┌───┐
q_0: ┤ Y ├
     └───┘

Equivalent to a \(\pi\) radian rotation about the Y axis.

注釈

A global phase difference exists between the definitions of \(RY(\pi)\) and \(Y\).

\[\begin{split}RY(\pi) = \begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix} = -i Y\end{split}\]

The gate is equivalent to a bit and phase flip.

\[\begin{split}|0\rangle \rightarrow i|1\rangle \\ |1\rangle \rightarrow -i|0\rangle\end{split}\]

Create new Y gate.

Attributes

decompositions#: Get the decompositions of the instruction from the SessionEquivalenceLibrary.

Methods

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

Return a (multi-)controlled-Y gate.

One control returns a CY gate.

パラメータ:

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.

戻り値:

controlled version of this gate.

戻り値の型:

ControlledGate