Abstract
Channel capacities of quantum channels can be nonadditive even if one of two quantum channels has no channel capacity. We call this phenomenon activation of the channel capacity. In this paper, we show that when we use a quantum channel on a qubit system, only a noiseless qubit channel can generate the activation of the zero-error classical capacity. In particular, we show that the zero-error classical capacity of two quantum channels on qubit systems cannot be activated. Furthermore, we present a class of examples showing the activation of the zero-error classical capacity in low-dimensional systems.
- Received 11 March 2018
DOI:https://doi.org/10.1103/PhysRevA.97.062314
©2018 American Physical Society
Physics Subject Headings (PhySH)
Quantum Information, Science & Technology