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I have spelled out (here) enough of the proof from Müller-Hermes & Perry 2019 (of how mixed unitary QBit channels are unistochastic) to work out the unistochastic presentation (now here) for the example of the spin-flip channel
[edit: there is something wrong with the last expression. Will check tomorrow.]
[edit: No, it was correct. But it can of course be simplified further…]
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