Your question is a bit tricky to me. 

You are trying to compare a theoretical quantum channel capacity with the capacity of a real technology for classical communication. I'd like to help here but first please simplify the question so that the comparison make sense. 

As regards your first question, I [published an experimental paper][1], exploiting indefinite causal orders to achieve communication by means of 0-capacity channels. In brief, the document explains and witness a quantum advantage in communication, by means of superposition of channels.


  [1]: https://www.researchgate.net/publication/356206180_Experiencing_the_communication_advantage_of_the_superposition_of_causal_orders