Polaractivation of hidden private classical capacity region of quantum channels

We define a new phenomenon for communication over noisy quantum channels. The investigated solution is called polaractivation. It is a natural consequence of the channel polarization effect in quantum systems and makes possible to open the hidden capacity regions of a noisy quantum channel. We demonstrate the results for the opening of private classical capacity-domain. With the help of the proposed polaractivation scheme private classical information can be transmitted over a quantum channel that initially was not capable of private communication. We also prove that the method works for arbitrary quantum channels for which a given criteria in the symmetric classical capacity is satisfied. We also derived a necessary lower bound on the rate of classical communication for the polaractivation of private classical capacity-domain.