Diamond-norm distance $\|\mathcal{N} - \mathcal{M}\|_\diamond$ between quantum channels (and $\mathrm{id}_R \otimes \mathcal{N}$)

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Diamond-norm distance $\|\mathcal{N} - \mathcal{M}\|_\diamond$ between quantum channels (and $\mathrm{id}_R \otimes \mathcal{N}$) · Prove2Me