> Isn't sending more than one photon always "repetition" in that sense? Yes. But regardless of whether its feasible to send single quanta in any given circumst

> Isn't sending more than one photon always "repetition" in that sense? Yes. But regardless of whether its feasible to send single quanta in any given circumstance, the redundant nature of the signals is key to understanding its much higher degree of robustness relative to quantum signals. And to be clear, you can absolutely send a classical signal with individual quanta.