GHZ State

\usepackage{quantikz}

\begin{quantikz}
  \lstick{$|0\rangle$} & \gate{H} & \ctrl{1} & \qw \\
  \lstick{$|0\rangle$} & \qw & \targ{} & \ctrl{1} \\
  \lstick{$|0\rangle$} & \qw & \qw & \targ{}
\end{quantikz}