\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing,decorations.pathmorphing}
\usetikzlibrary{fit,quotes}
\usepackage{yquant, braket}
\input{utils}

\begin{document}
\begin{tikzpicture}
\begin{yquant}
  [name=ypos]
  qubit[2] q;
  cnot q[1] | q[0];
  box {$R_Y(\pi/2)$} q[1];
  cnot q[1] | q[0];
  [name=rz] box {$R_Z(\pi/4)$} q[0];
\end{yquant}
\draw [line width=1pt, ->, dashed]
([yshift=1mm, xshift=-2mm] rz-0.north west)
to [bend right]
(ypos-0);
\end{tikzpicture}
\end{document}
