1205.5851 (Jeonghoon Park et al.)

Zero-error classical capacity of qubit channels cannot be superactivated    [PDF]

Jeonghoon Park, Soojoon Lee

It was shown [T.S. Cubitt et al., IEEE Trans. Inform. Theory 57, 8114 (2011)] that there exist quantum channels where a single use cannot transmit classical information perfectly yet two uses can. This phenomenon is called the superactivation of the zero-error classical capacity which does not occur in classical channels. In this paper, it is shown that qubit channels cannot generate the superactivation.

View original: http://arxiv.org/abs/1205.5851