File:The quantum logic gates that generates the 3-qubit GHZ state.png

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% Qcircuit script showing the creation of a three-qubit GHZ state
%%%

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

%%%
\begin{document}
\[
\Qcircuit @C=1.0em @R=.7em {
    \lstick{\ket{0}} & \gate{H} & \ctrl{1} & \qw      & \qw & & & \raisebox{-11ex}{$\Bigg\} \frac{|000\rangle + |111\rangle}{\sqrt{2}}$} \\
    \lstick{\ket{0}} & \qw      & \targ    & \ctrl{1} & \qw & & & \\
    \lstick{\ket{0}} & \qw      & \qw      & \targ    & \qw & & & 
}
\]
\end{document}
%%%

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