Holevo 1973 / Schumacher-Westmoreland 1997 / Holevo 1998: classical capacity of quantum channel chi(rho) = S(sum p_i rho_i) - sum p_i S(rho_i); foundational for quantum information theory.
Holevo 1973 / Schumacher-Westmoreland 1997 / Holevo 1998: classical capacity of quantum channel chi(rho) = S(sum p_i rho_i) - sum p_i S(rho_i); foundational for quantum information theory.