@!@
newcommand{vraag}[1]{small{textit{#1}}vspace{1em}}
newcommand{px}{left(begin{array}{rr}0&1\1&0end{array}right)}
newcommand{py}{left(begin{array}{rr}0&-i\i&0end{array}right)}
newcommand{pz}{left(begin{array}{rr}1&0\0 &-1end{array}right)}
newcommand{qubit}[1]{|#1rangle}
newcommand{bra}[1]{langle#1|}
newcommand{ket}{qubit}
renewcommand{deg}[1]{textrm{deg}left(#1right)}
newcommand{tensor}{otimes}
newcommand{Hone}{(qubit{0} - qubit{1})}
newcommand{Hzero}{(qubit{0} + qubit{1})}
newcommand{norm}[1]{|#1|}
renewcommand{max}[1]{mathop{textrm{max}}_{#1}}
newcommand{note}[1]{textit{textbf{Note: }#1}}
@!@