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I found that Qiskit uses Unroll3qOrMore in the transpiler class function to decompose an arbitrary $n > 2$ unitary and represent it as a directed acyclic graph (DAG). But I can't find an algorithm (or paper for it). Could you help?

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For $n > 2$ qubit gates the Qiskit transpiler uses column-by-column decomposition (see: https://arxiv.org/pdf/1501.06911.pdf).

Source: https://www.youtube.com/watch?v=O2WcZS4yO1Q (comment section)

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