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Yet another condition for a map to be completely-positive and trace-preserving

First the short answer: The procedure desribed in the original post & subsequent comments guarantees that the map is positive, trace preserving but does, surprisingly, not characterize complete ...
Frederik vom Ende's user avatar
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Depolarizing channel on GHZ-state

Either can be considered (except I think you've got your values of $d$ swapped around, but that's easy to check because you want your output to have trace 1 if your input did). In terms of which is ...
DaftWullie's user avatar
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