English: This quantum circuit implements a three-qubit Toffoli gate composed from one- and two-qubit gates. Each of the three wires represents one qubit, and this circuit diagram should be read left-to-right. The single-qubit gates used are the standard Hadamard gate (H) and the ${\displaystyle \pi /8}$ (T) gate, as well as its conjugate transpose, represented by the "dagger" symbol. The only two-qubit gate used is the "CNOT" gate. Given a three-qubit standard-basis input state ${\displaystyle |x,y,z\rangle }$, the output is ${\displaystyle |x,y,z\oplus (x\land y)\rangle }$. This particular implementation is from the standard library of OpenQASM 2.

The following LaTeX code was used to generate this image:

\documentclass[tikz]{standalone}
\usepackage{quantikz}
\begin{document}
\begin{quantikz}[row sep=2mm,column sep=2mm]
& \qw      & \qw      & \qw              & \ctrl{2} & \qw      & \qw      & \qw              & \ctrl{2} & \qw      & \ctrl{1} & \gate{T}         & \ctrl{1} & \qw \\
& \qw      & \ctrl{1} & \qw              & \qw      & \qw      & \ctrl{1} & \qw              & \qw      & \gate{T} & \targ{}  & \gate{T^\dagger} & \targ{}  & \qw \\
& \gate{H} & \targ{}  & \gate{T^\dagger} & \targ{}  & \gate{T} & \targ{}  & \gate{T^\dagger} & \targ{}  & \gate{T} & \gate{H} & \qw              & \qw      & \qw
\end{quantikz}
\end{document}