Abstract
In this note we introduce purification for a pair (ρ, Φ), where ρ is a quantum state and Φ is a channel, which allows in particular a natural extension of the properties of related information quantities (mutual and coherent informations) to the channels with arbitrary input and output spaces.
PACS: 03.67.Hk
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Holevo, A. On States, Channels, and Purification. Quantum Information Processing 1, 1–4 (2002). https://doi.org/10.1023/A:1019686124563
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DOI: https://doi.org/10.1023/A:1019686124563