Manuscript En05-C@1 · En05-C.tex · section · aa213ea6

Approximate comparison

Operational no-signalling and approximate certificates › Approximate comparison · lines 1689–1697

For states on any unital $C^{*}$ -algebra use

d (ω, ν) = \frac{1}{2} ∥ ω - ν ∥ .

For finite matrix or hybrid algebras this is trace distance. For classical finite algebras it is total variation.

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