Abstract
This paper investigates properties of noisy quantum information channels. We define a quantity called coherent information, which measures the amount of quantum information conveyed in the noisy channel. This quantity can never be increased by quantum information processing, and it yields a simple necessary and sufficient condition for the existence of perfect quantum error correction. © 1996 The American Physical Society.
- Received 26 April 1996
DOI:https://doi.org/10.1103/PhysRevA.54.2629
©1996 American Physical Society
