Other information

% Qcircuit script for the picture
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass{amsart}

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

\vfuzz2pt

%%% ----------------------------------------------------------------------
\begin{document}
\[
\Qcircuit @C=1em @R=.7em {
    \lstick{\psi} & \qw   & \qw    & \gate{U}          & \qw \\
    \lstick{\phi} & \qw   & \meter & \control \cw \cwx & \cw 
}
\]
\end{document}
% ------------------------------------------------------------------------

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