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#!/usr/bin/env pyscript
# $Id: stateSwap.py,v 1.5 2006/02/14 14:23:09 paultcochrane Exp $
"""
State swapping quantum computing circuit diagram. Uses the
quantumcircuits library.
"""
# import the pyscript libraries
from pyscript import *
from pyscript.lib.quantumcircuits import *
# define some handy LaTeX macros
defaults.tex_head=r"""
\documentclass{article}
\pagestyle{empty}
\newcommand{\ket}[2]{\mbox{$|#1\rangle_{#2}$}}
\newcommand{\bra}[1]{\mbox{$\langle #1|$}}
\newcommand{\braket}[2]{\mbox{$\langle #1|#2\rangle$}}
\newcommand{\op}[1]{\mbox{\boldmath $\hat{#1}$}}
\begin{document}
"""
# define the rails
rail1 = Rail(w=P(0,0), length=3.0,
labelIn=r'\ket{\psi}{}', labelOut=r'\ket{\phi}{}')
rail2 = Rail(w=P(0,1), length=3.0,
labelIn=r'\ket{\phi}{}', labelOut=r'\ket{\psi}{}')
# three controlled nots
cnot1 = Cnot(c=P(0.5,0), targetDist=1.0, direction="up")
cnot2 = Cnot(c=P(1.5,1), targetDist=1.0, direction="down")
cnot3 = Cnot(c=P(2.5,0), targetDist=1.0, direction="up")
# draw it!
render(rail1, rail2, cnot1, cnot2, cnot3,
file="stateSwap.eps")
# vim: expandtab shiftwidth=4:
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