\documentclass{article}
\usepackage{quantikz}

\begin{document}

\usepackage{quantikz}

\begin{quantikz}
    q_{1} & \gate[4]{e^{i t H_C}} & \\
    q_{2} &                    & \\
    q_{3} &                    & \\
    q_{4} &                    & \\
\end{quantikz}

\end{document}
