Quantum capacity is properly defined without encodings

Howard Barnum, John A. Smolin, Barbara M. Terhal

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)


We show that no source encoding is needed in the definition of the capacity of a quantum channel for carrying quantum information. This allows us to use the coherent information maximized over all sources and block sizes, but not encodings, to bound the quantum capacity. We perform an explicit calculation of this maximum coherent information for the quantum erasure channel and apply the bound in order find the erasure channel’s capacity without relying on an unproven assumption as in an earlier paper.

Original languageEnglish
Pages (from-to)3496-3501
Number of pages6
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5
Publication statusPublished - 1998
Externally publishedYes


Dive into the research topics of 'Quantum capacity is properly defined without encodings'. Together they form a unique fingerprint.

Cite this