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+\documentclass[11pt]{article}
+\usepackage[utf8]{inputenc}
+\usepackage{amsmath}
+\usepackage{amsfonts}
+\usepackage{physics}
+\usepackage{yquant}
+
+
+\begin{document}
+
+\section{SWAP}
+
+\begin{tikzpicture}
+	\begin{yquant}[operator/separation=5mm]
+		qubit {$\ket{\psi_1}$} a;
+		qubit {$\ket{\psi_2}$} b;
+
+		swap (a, b);
+	\end{yquant}
+\end{tikzpicture}
+
+\section{CNOT}
+
+\begin{tikzpicture}
+	\begin{yquant}[operator/separation=5mm]
+		qubit {$\ket{\psi_1}$} a;
+		qubit {$\ket{\psi_2}$} b;
+
+		cnot b | a;
+	\end{yquant}
+\end{tikzpicture}
+
+\section{CU}
+
+\begin{tikzpicture}
+	\begin{yquant}[operator/separation=5mm]
+		qubit {$\ket{\psi_1}$} a;
+		qubit {$\ket{\psi_2}$} b;
+
+		box {$U$} b | a;
+	\end{yquant}
+\end{tikzpicture}
+
+\end{document}