% 
% File:	  test6.qasm
% Date:	  22-Mar-04
% Author: I. Chuang <ichuang@mit.edu>
%
% Sample qasm input file - demonstrate
% multiple-qubit controlled single-q-gates
% 
% 	def	c-U,3,'U'
% 
% 	qubit	j0
% 	qubit	j1
% 	qubit	j2
% 	qubit	j3
% 
% 	toffoli	j0,j1,j2
% 	X	j0
% 	c-U	j2,j3,j0,j1
% 	H	j2
% 	measure	j3

%  Time 01:
%    Gate 00 toffoli(j0,j1,j2)
%  Time 02:
%    Gate 01 X(j0)
%  Time 03:
%    Gate 02 c-U(j2,j3,j0,j1)
%  Time 04:
%    Gate 03 H(j2)
%    Gate 04 measure(j3)

% Qubit circuit matrix:
%
% j0: gAA, gBA, gCA, n  , n  
% j1: gAB, n  , gCB, n  , n  
% j2: gAC, n  , gCC, gDC, n  
% j3: n  , n  , gCD, gDD, N  

\documentclass[11pt]{article}
\input{xyqcirc.tex}

% definitions for the circuit elements

\def\gAA{\b\w\A{gAA}}
\def\gAB{\b\w\A{gAB}}
\def\gAC{\o\w\A{gAC}}
\def\gBA{\op{X}\w\A{gBA}}
\def\gCC{\b\w\A{gCC}}
\def\gCD{\b\w\A{gCD}}
\def\gCA{\b\w\A{gCA}}
\def\gCB{\op{U}\w\A{gCB}}
\def\gDC{\op{H}\w\A{gDC}}
\def\gDD{\meter\w\A{gDD}}

% definitions for bit labels and initial states

\def\bA{ \q{j_{0}}}
\def\bB{ \q{j_{1}}}
\def\bC{ \q{j_{2}}}
\def\bD{ \q{j_{3}}}

% The quantum circuit as an xymatrix

\xymatrix@R=5pt@C=10pt{
    \bA & \gAA &\gBA &\gCA &\n   &\n  
\\  \bB & \gAB &\n   &\gCB &\n   &\n  
\\  \bC & \gAC &\n   &\gCC &\gDC &\n  
\\  \bD & \n   &\n   &\gCD &\gDD &\N  
%
% Vertical lines and other post-xymatrix latex
%
\ar@{-}"gAC";"gAA"\ar@{-}"gAC";"gAB"
\ar@{-}"gCB";"gCC"\ar@{-}"gCB";"gCD"\ar@{-}"gCB";"gCA"
}

\end{document}