Detecting lower bounds to classical capacity of correlated quantum channels

Following a method to detect lower bounds of the classical capacity of quantum channels, we extend it to two-qubit correlated channels. Taking the correlated dephasing channel, the correlated depolarizing channel and the fully correlated amplitude damping channel as examples, we illustrate that the scheme is efficient and a tight lower bound could be detected in some circumstances.

Automated summary

The method of detecting lower bounds of the classical capacity of quantum channels is extended to two-qubit correlated channels in this paper. The efficiency of the scheme is demonstrated through examples involving the correlated dephasing channel, correlated depolarizing channel, and fully correlated amplitude damping channel.