HGate#

class qiskit.circuit.library.HGate(label=None)[Quellcode]#

Bases: Gate

Single-qubit Hadamard gate.

This gate is a pi rotation about the X+Z axis, and has the effect of changing computation basis from \(|0\rangle,|1\rangle\) to \(|+\rangle,|-\rangle\) and vice-versa.

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

Circuit symbol:

     ┌───┐
q_0: ┤ H ├
     └───┘

Matrix Representation:

\[\begin{split}H = \frac{1}{\sqrt{2}} \begin{pmatrix} 1 & 1 \\ 1 & -1 \end{pmatrix}\end{split}\]

Create new H gate.

Attributes

condition_bits#: Get Clbits in condition.

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

definition#: Return definition in terms of other basic gates.

duration#: Get the duration.

label#: Return instruction label

name#: Return the name.

num_clbits#: Return the number of clbits.

num_qubits#: Return the number of qubits.

params#: return instruction params.

unit#: Get the time unit of duration.

Methods

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

Return a (multi-)controlled-H gate.

One control qubit returns a CH gate.

Parameter:

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.

Rückgabe:

controlled version of this gate.

Rückgabetyp:

ControlledGate

inverse()[Quellcode]#: Return inverted H gate (itself).