Other information

% Qcircuit script for the picture
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\documentclass{amsart}
\usepackage[matrix,frame,arrow]{xypic}
\usepackage[braket]{qcircuit}
\vfuzz2pt

%%%

\begin{document}
\[
\Qcircuit @C=1.0em @R=.7em {
    \lstick{\ket{A}}             & \ctrl{3}  & \ctrl{1} & \qw      & \qw      & \ctrl{1} & \qw & \rstick{\ket{A}} \\
    \lstick{\ket{B}}             & \ctrl{2}  & \targ    & \ctrl{2} & \ctrl{1} & \targ    & \qw & \rstick{\ket{B}} \\
    \lstick{\ket{C_\text{in}}}   & \qw       & \qw      & \ctrl{1} & \targ    & \qw      & \qw & \rstick{\ket{S}} \\
    \lstick{\ket{0}}             & \targ     & \qw      & \targ    & \qw      & \qw      & \qw & \rstick{\ket{C_\text{out}}}\gategroup{1}{6}{2}{6}{.7em}{..}
}
\]
\end{document}

%%%

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