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‎Qcircuit.sty

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% qcircuit version 2.5.3
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% Contributors: Steve Flammia, Bryan Eastin, Travis Scholten
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% This program is free software; you can redistribute it and/or modify
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% it under the terms of the GNU General Public License as published by
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% the Free Software Foundation; either version 2 of the License, or
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% (at your option) any later version.
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%
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% This program is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU General Public License
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% along with this program; if not, write to the Free Software
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% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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% Thanks to the Xy-pic guys, Kristoffer H Rose, Ross Moore, and Daniel Müllner,
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% for their help in making Qcircuit work with Xy-pic version 3.8.
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% Thanks also to Dave Clader, Andrew Childs, Rafael Possignolo, Tyson Williams,
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% Sergio Boixo, Cris Moore, Jonas Anderson, and Stephan Mertens for helping us test
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% and/or develop the new version.
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\ProvidesPackage{qcircuit}[2016/12/29]
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\RequirePackage{xy}
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\DeclareOption{braket}{
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\newcommand{\bra}[1]{\ensuremath{\left\langle{#1}\right\vert}}
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\newcommand{\ket}[1]{\ensuremath{\left\vert{#1}\right\rangle}}
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}
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\DeclareOption{qm}{
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\newcommand{\ip}[2]{\ensuremath{\left\langle{#1}\middle\vert{#2}\right\rangle}}
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\newcommand{\melem}[3]{\ensuremath{\left\langle{#1}\middle\vert{#2}\middle\vert{#3}\right\rangle}}
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\newcommand{\expval}[1]{\ensuremath{\left\langle #1 \right\rangle}}
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\newcommand{\op}[2]{\ensuremath{\left\vert{#1}\middle\rangle\middle\langle{#2}\right\vert}}
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}
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\ProcessOptions\relax
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\xyoption{matrix}
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\xyoption{frame}
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\xyoption{arrow}
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\xyoption{arc}
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\usepackage{ifpdf}
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\ifpdf
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\else
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\PackageWarningNoLine{Qcircuit}{qcircuit is not loading in PDF mode. Activating all Xy-pic features to compensate. If you wish to use specific drivers for Xy-pic, you must modify the code in qcircuit.sty}
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% The following option loads all the features in Xy-pic. This
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% this is included as work-around to ensure documents compile
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% images correctly when using XeLaTeX.
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\xyoption{all}
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\fi
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% The following resets Xy-pic matrix alignment to the pre-3.8 default, as
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% required by Qcircuit.
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\entrymodifiers={!C\entrybox}
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\newcommand{\qw}[1][-1]{\ar @{-} [0,#1]}
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% Defines a wire that connects horizontally. By default it connects to the object on the left of the current object.
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% WARNING: Wire commands must appear after the gate in any given entry.
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\newcommand{\qwx}[1][-1]{\ar @{-} [#1,0]}
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% Defines a wire that connects vertically. By default it connects to the object above the current object.
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% WARNING: Wire commands must appear after the gate in any given entry.
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\newcommand{\qwa}[1][-1]{\ar @{<-} [0,#1]}
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% Defines a wire that connects horizontally with an arrow. By default it makes an end wire with an arrow indicating the end of the circuit.
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% WARNING: Wire commands must appear after the gate in any given entry.
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\newcommand{\cw}[1][-1]{\ar @{=} [0,#1]}
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% Defines a classical wire that connects horizontally. By default it connects to the object on the left of the current object.
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% WARNING: Wire commands must appear after the gate in any given entry.
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\newcommand{\cwx}[1][-1]{\ar @{=} [#1,0]}
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% Defines a classical wire that connects vertically. By default it connects to the object above the current object.
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% WARNING: Wire commands must appear after the gate in any given entry.
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\newcommand{\cwa}[1][-1]{\ar @{<=} [0,#1]}
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% Defines a classical wire that connects horizontally with an arrow. By default it makes an end wire with an arrow indicating the end of the circuit.
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% WARNING: Wire commands must appear after the gate in any given entry.
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\newcommand{\cds}[2]{*+<1em,.9em>{\hphantom{#2}} \POS [0,0].[#1,0]="e",!C *{#2};"e"+ R \qw}
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% Allows the insertion of text without a box and exands circuit around this text.
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% This is useful for such things as ... to indicate a generalized circuit.
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\newcommand{\gate}[1]{*+<.6em>{#1} \POS ="i","i"+UR;"i"+UL **\dir{-};"i"+DL **\dir{-};"i"+DR **\dir{-};"i"+UR **\dir{-},"i" \qw}
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% Boxes the argument, making a gate.
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\newcommand{\sgate}[2]{\gate{#1} \qwx[#2]}
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% Creates a gate and a qwx wire going #2 spots below, for a gate split over
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% non-adjacent rows
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\newcommand{\meter}{*=<1.8em,1.4em>{\xy ="j","j"-<.778em,.322em>;{"j"+<.778em,-.322em> \ellipse ur,_{}},"j"-<0em,.4em>;p+<.5em,.9em> **\dir{-},"j"+<2.2em,2.2em>*{},"j"-<2.2em,2.2em>*{} \endxy} \POS ="i","i"+UR;"i"+UL **\dir{-};"i"+DL **\dir{-};"i"+DR **\dir{-};"i"+UR **\dir{-},"i" \qw}
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% Inserts a measurement meter.
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% In case you're wondering, the constants .778em and .322em specify
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% one quarter of a circle with radius 1.1em.
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% The points added at + and - <2.2em,2.2em> are there to strech the
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% canvas, ensuring that the size is unaffected by erratic spacing issues
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% with the arc.
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\newcommand{\metersymb}{\xy ="j","j"-<.778em,.322em>;{"j"+<.778em,-.322em> \ellipse ur,_{}},"j"-<0em,.4em>;p+<.5em,.9em> **\dir{-},"j"+<2.2em,2.2em>*{},"j"-<2.2em,2.2em>*{} \endxy}
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% A longer meter
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\newcommand{\meterB}[1]{*=<1.8em,2.6em>{\xy 0;<0em,-.8em>:
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0*{\begingroup
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\everymath{\scriptstyle}
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\tiny #1 \endgroup},<0em,.7em>*{\xy ="j","j"-<.778em,-.322em>;{"j"+<.778em,.322em> \ellipse ur,_{}},"j"-<0em,-.2em>;p+<.5em,.9em> **\dir{-},"j"+<2.2em,2.2em>*{},"j"-<2.2em,2.2em>*{} \endxy}
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\endxy} \POS ="i","i"+UR;"i"+UL **\dir{-};"i"+DL **\dir{-};"i"+DR **\dir{-};"i"+UR **\dir{-},"i" \qw}
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% A meter that allows for a measurement operator to be added below
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\newcommand{\smeterB}[2]{\meterB{#1} \qwx[#2] \qw}
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% A split meter that allows for a measurement operator to be split over non-
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% adjacent rows
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\newcommand{\measure}[1]{*+[F-:<.9em>]{#1} \qw}
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% Inserts a measurement bubble with user defined text.
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\newcommand{\measuretab}[1]{*{\xy*+<.6em>{#1}="e";"e"+UL;"e"+UR **\dir{-};"e"+DR **\dir{-};"e"+DL **\dir{-};"e"+LC-<.5em,0em> **\dir{-};"e"+UL **\dir{-} \endxy} \qw}
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% Inserts a measurement tab with user defined text.
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\newcommand{\measureD}[1]{*{\xy*+=<0em,.1em>{#1}="e";"e"+UR+<0em,.25em>;"e"+UL+<-.5em,.25em> **\dir{-};"e"+DL+<-.5em,-.25em> **\dir{-};"e"+DR+<0em,-.25em> **\dir{-};{"e"+UR+<0em,.25em>\ellipse^{}};"e"+C:,+(0,1)*{} \endxy} \qw}
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% Inserts a D-shaped measurement gate with user defined text.
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\newcommand{\multimeasure}[2]{*+<1em,.9em>{\hphantom{#2}} \qw \POS[0,0].[#1,0];p !C *{#2},p \drop\frm<.9em>{-}}
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% Draws a multiple qubit measurement bubble starting at the current position and spanning #1 additional gates below.
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% #2 gives the label for the gate.
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% You must use an argument of the same width as #2 in \ghost for the wires to connect properly on the lower lines.
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\newcommand{\multimeasureD}[2]{*+<1em,.9em>{\hphantom{#2}} \POS [0,0]="i",[0,0].[#1,0]="e",!C *{#2},"e"+UR-<.8em,0em>;"e"+UL **\dir{-};"e"+DL **\dir{-};"e"+DR+<-.8em,0em> **\dir{-};{"e"+DR+<0em,.8em>\ellipse^{}};"e"+UR+<0em,-.8em> **\dir{-};{"e"+UR-<.8em,0em>\ellipse^{}},"i" \qw}
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% Draws a multiple qubit D-shaped measurement gate starting at the current position and spanning #1 additional gates below.
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% #2 gives the label for the gate.
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% You must use an argument of the same width as #2 in \ghost for the wires to connect properly on the lower lines.
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\newcommand{\control}{*!<0em,.025em>-=-<.2em>{\bullet}}
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% Inserts an unconnected control.
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\newcommand{\controlo}{*+<.01em>{\xy -<.095em>*\xycircle<.19em>{} \endxy}}
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% Inserts a unconnected control-on-0.
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\newcommand{\ctrl}[1]{\control \qwx[#1] \qw}
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% Inserts a control and connects it to the object #1 wires below.
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\newcommand{\ctrlo}[1]{\controlo \qwx[#1] \qw}
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% Inserts a control-on-0 and connects it to the object #1 wires below.
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\newcommand{\cctrl}[1]{\control \cwx[#1] \cw}
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% Inserts a classical control and connects it to the object #1 wires below.
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\newcommand{\cctrlo}[1]{\controlo \cwx[#1] \cw}
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% Inserts a classical control-on-0 and connects it to the object #1 wires below.
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\newcommand{\targ}{*+<.02em,.02em>{\xy ="i","i"-<.39em,0em>;"i"+<.39em,0em> **\dir{-}, "i"-<0em,.39em>;"i"+<0em,.39em> **\dir{-},"i"*\xycircle<.4em>{} \endxy} \qw}
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% Inserts a CNOT target.
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\newcommand{\qswap}{*=<0em>{\times} \qw}
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% Inserts half a swap gate.
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% Must be connected to the other swap with \qwx.
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\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}
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% Draws a multiple qubit gate starting at the current position and spanning #1 additional gates below.
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% #2 gives the label for the gate.
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% You must use an argument of the same width as #2 in \ghost for the wires to connect properly on the lower lines.
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\newcommand{\ghost}[1]{*+<1em,.9em>{\hphantom{#1}} \qw}
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% Leaves space for \multigate on wires other than the one on which \multigate appears. Without this command wires will cross your gate.
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% #1 should match the second argument in the corresponding \multigate.
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\newcommand{\push}[1]{*{#1}}
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% Inserts #1, overriding the default that causes entries to have zero size. This command takes the place of a gate.
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% Like a gate, it must precede any wire commands.
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% \push is useful for forcing columns apart.
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% NOTE: It might be useful to know that a gate is about 1.3 times the height of its contents. I.e. \gate{M} is 1.3em tall.
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% WARNING: \push must appear before any wire commands and may not appear in an entry with a gate or label.
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\newcommand{\gategroup}[6]{\POS"#1,#2"."#3,#2"."#1,#4"."#3,#4"!C*+<#5>\frm{#6}}
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% Constructs a box or bracket enclosing the square block spanning rows #1-#3 and columns=#2-#4.
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% The block is given a margin #5/2, so #5 should be a valid length.
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% #6 can take the following arguments -- or . or _\} or ^\} or \{ or \} or _) or ^) or ( or ) where the first two options yield dashed and
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% dotted boxes respectively, and the last eight options yield bottom, top, left, and right braces of the curly or normal variety. See the Xy-pic reference manual for more options.
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% \gategroup can appear at the end of any gate entry, but it's good form to pick either the last entry or one of the corner gates.
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% BUG: \gategroup uses the four corner gates to determine the size of the bounding box. Other gates may stick out of that box. See \prop.
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\newcommand{\inputgroupv}[5]{\POS"#1,1"."#2,1"."#1,1"."#2,1"!C*+<#3>\frm{\{}, \POS"#1,1"."#2,1"."#1,1"."#2,1"*!C!<1.7em,#4>=<0em>{#5}}
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% Constructs an input group with label #5 and a grouping { from rows #1 to #2 with #3 and #4 controlling the spacing
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\newcommand{\inputgroup}[4]{\POS"#1,1"."#2,1"."#1,1"."#2,1", \POS"#1,1"."#2,1"."#1,1"."#2,1"*!C!<1em,#3>=<0em>{#4}}
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% Constructs an input group with label #4 from rows #1 to #2 with #3 controlling the spacing
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\newcommand{\inputgrouph}[5]{\POS"#1,1"."#2,1"."#1,1"."#2,1", \POS"#1,1"."#2,1"."#1,1"."#2,1"*!C!<#5,#3>=<0em>{#4}}
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% Constructs an input group with label #4 and a grouping /vdots from rows #1 to #2 with #3 and #5 controlling the spacing
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\newcommand{\rstick}[1]{*!L!<-.5em,0em>=<0em>{#1}}
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% Centers the left side of #1 in the cell. Intended for lining up wire labels. Note that non-gates have default size zero.
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\newcommand{\lstick}[1]{*!R!<.5em,0em>=<0em>{#1}}
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% Centers the right side of #1 in the cell. Intended for lining up wire labels. Note that non-gates have default size zero.
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\newcommand{\ustick}[1]{*!D!<0em,-.5em>=<0em>{#1}}
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% Centers the bottom of #1 in the cell. Intended for lining up wire labels. Note that non-gates have default size zero.
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\newcommand{\dstick}[1]{*!U!<0em,.5em>=<0em>{#1}}
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% Centers the top of #1 in the cell. Intended for lining up wire labels. Note that non-gates have default size zero.
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\newcommand{\Qcircuit}{\xymatrix @*=<0em>}
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% Defines \Qcircuit as an \xymatrix with entries of default size 0em.
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\newcommand{\link}[2]{\ar @{-} [#1,#2]}
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% Draws a wire or connecting line to the element #1 rows down and #2 columns forward.
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\newcommand{\pureghost}[1]{*+<1em,.9em>{\hphantom{#1}}}
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% Same as \ghost except it omits the wire leading to the left.
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\endinput

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