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The Qtree package is "a LaTeX package for drawing tree diagrams." Is it possible to draw simple graph-like diagrams with it, similar to the one depicted below? If not, should I resort to TikZ-qtree?

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I don't think this is possible to do with qtree. (It is, after all qtree and not qgraph :-)) But it should be fairly easy to do in tikz-qtree I think. Since the basic syntax is the same, but tikz-qtree is much more powerful, I would start there. – Alan Munn Aug 12 '11 at 22:50
@Alan: Thanks. Could you please help me with the tikz-qtree code? – Sadeq Dousti Aug 12 '11 at 22:55

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Here's one solution.

\documentclass{article}
\usepackage{tikz-qtree}
\begin{document}

\begin{tikzpicture}[sibling distance=1cm, every node/.style={font=\sffamily}]

\Tree [.PSPACE 
      [.PP  
        [.BQP 
            [.BPP  \edge[white]; {} \edge; \node[xshift=2cm] (P) {P}; ] ] 
            [.\node (NP) {NP}; ]]]
\draw (P.north) -- (NP.south);

\end{tikzpicture}
\end{document}

Update

I've changed the method of moving the P node so that it is centred correctly. (Output image has been put in an \fbox to show the image edges.)

output of code

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+1, thanks. There's one minor problem, though: although the \edge[white]; command hides the edge, it prevents the diagram from correctly being centered on the page. – Sadeq Dousti Aug 13 '11 at 0:27
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Removing \phantom{\hspace{4cm}} (leaving just empty braces) makes the positioning a whole lot better, though it's still very slightly off centre. – Jake Aug 13 '11 at 0:43
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@Sadeq Jake's comment is right. I added the \phantom to centre the P relative to the PSPACE. You can remove it and add [xshift=2cm] to the P node. – Alan Munn Aug 13 '11 at 1:37

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