Subadditivity condition for spin-tomograms and density matrices of arbitrary composite and noncomposite qudit systems
V. N. Chernega, O. V. Man’ko, V. I. Man’ko · 2016
We obtain a new quantum entropic inequality for the states of a system of n ≥ 1 qudits. The inequality has the form of the quantum subadditivity condition of a bipartite qudit system and coincides with the subadditivity condition for the system of two qudits. We formulate a general statement on the existence of the subadditivity condition for an arbitrary probability distribution and an arbitrary qudit-system tomogram. We discuss the nonlinear quantum channels creating the entangled states from separable states.