Talk:Quantum gate

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The article asserts that R(\cos^{-1}\begin{matrix} \frac{3}{5} \end{matrix})) along with a couple of other gates form a "universal" set of gates. What is the significance and/or derivation of 3/5? Would other angles work as well? What is the critical property of the particular angle? --David Battle 01:39, 18 August 2005 (UTC)

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