Neutrino Communications

Like lasers and radio waves, neutrinos can potentially be used to carry messages over interstellar distances, and unlike electromagnetic radiation, neutrinos have the added advantage of travelling extremely quickly and minimally interfering with the intervening interstellar medium.

Detectability

Generating and manipulating neutrinos to the degree necessary to formulate a complex message, or monitoring incoming neutrinos for such a message, is right at or beyond the furthest edge of human technology.