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add multigate with classical wire incoming #39

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0bfe597
add multigate with classical wire incoming
Nov 26, 2020
a0ca8d3
add `cmultigate` to the tutorial
adud Nov 4, 2021
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16 changes: 16 additions & 0 deletions Qtutorial.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -361,6 +361,21 @@ \subsection{Multiple qubit gates \label{S:multigate}}
& \qw & \ghost{U} & \qw & \qw
}\end{verbatim}}

Finally, the command \verb=\cmultigate= creates a multigate with a classical first input (for which \verb=\cghost= is not an option).

\[ \Qcircuit @C=1em @R=0em {
& \cw & \cmultigate{3}{U} & \cw & \cw \\
& \qw & \ghost{U} & \qw & \qw \\
& \cdots & \nghost{U} & \cdots & \\
& \qw & \ghost{U} & \qw & \qw
}\]
{\small \begin{verbatim}\Qcircuit @C=1em @R=0em {
& \cw & \cmultigate{3}{U} & \cw & \cw \\
& \qw & \ghost{U} & \qw & \qw \\
& \cdots & \nghost{U} & \cdots & \\
& \qw & \ghost{U} & \qw & \qw
}\end{verbatim}}

Note that controls to multiple qubit gates work the same as for single
qubit gates, using \verb=\ctrl= and \verb=\qwx=.

Expand Down Expand Up @@ -766,6 +781,7 @@ \section{Table of Commands}
\char92 targ \\
\char92 qswap \\
\char92 multigate\{\#1\}\{\#2\} \\
\char92 cmultigate\{\#1\}\{\#2\} \\
\char92 sgate\{\#1\}\{\#2\}\\
\char92 ghost\{\#1\} \\
\char92 cghost\{\#1\} \\
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4 changes: 3 additions & 1 deletion qcircuit.sty
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Expand Up @@ -138,7 +138,9 @@
% Inserts half a swap gate.
% Must be connected to the other swap with \qwx.
\newcommand{\multigate}[2]{*+<1em,.9em>{\hphantom{#2}} \POS [0,0]="i",[0,0].[#1,0]="e",!C *{#2},"e"+UR;"e"+UL **\dir{-};"e"+DL **\dir{-};"e"+DR **\dir{-};"e"+UR **\dir{-},"i" \qw}
% Draws a multiple qubit gate starting at the current position and spanning #1 additional gates below.
\newcommand{\cmultigate}[2]{*+<1em,.9em>{\hphantom{#2}} \POS [0,0]="i",[0,0].[#1,0]="e",!C *{#2},"e"+UR;"e"+UL **\dir{-};"e"+DL **\dir{-};"e"+DR **\dir{-};"e"+UR **\dir{-},"i" \cw}
% Same as multigate but with a classical incoming wire
% Draws a multiple qubit gate starting at the current position and spanning #1 additional gates below.
% #2 gives the label for the gate.
% You must use an argument of the same width as #2 in \ghost for the wires to connect properly on the lower lines.
\newcommand{\ghost}[1]{*+<1em,.9em>{\hphantom{#1}} \qw}
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