The quantum capacity is properly defined without encodings

Details The quantum capacity is properly defined without encodings The quantum capacity is properly defined without encodings

1997-11-17

arxiv.org/abs/quant-ph/9711032v2

Phys.Rev.A58:3496,1998

Physics

Quantum Physics

19 pages revtex with two eps figures. Submitted to Phys. Rev. A. Replaced with revised and simplified version, and improved re

Scientific paper

10.1103/PhysRevA.58.3496

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 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.

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