On States, Channels, and Purification

  • Authors:

  • A. S. Holevo

  • Affiliations:

  • Steklov Mathematical Institute, Russian Academy of Sciences, Moscow, Russia

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2002

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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