(color online) Variations of the position and momentum entropy densities with position x and momentum p for a single-quantum well system. The total system length is 60 nm. The blue solid line, green dashed line, black dotted line, and purple dash-dotted line denote the position and momentum entropy densities for the normalized ground state, 1st, 2nd, and 6th excited states, respectively. Panels (a)–(f) are plotted for different confined potential depths.