Figure 2: (Color online) Entanglement of periodic states as a function of their period, r , for q = 8 qubits and l = 0 shift (a), q = 8 and l = 6 (b), q = 10 and l = 0 (c), and q = 10 and l = 13 (d). The numerically calculated values are given in red circles, the approximated (more accurate) formula is represented by blue crosses, and the simple approximated (less accurate) formula is represented by a black line. Only odd periods were calculated. Similar results were obtained with up to 12 qubits and all possible shifts. 21 0 20 40 60 80 100 120 0 1 2 3 (a) q = 8 ; l = 0 G ( ψ q $_{r,l}$) − ln ( P q $_{r,l}$) G q r 0 20 40 60 80 100 120 0 1 2 3 (b) q = 8 ; l = 6 0 50 100 150 200 250 300 350 400 450 500 0 1 2 3 4 (c) q = 10 ; l = 0 0 50 100 150 200 250 300 350 400 450 500 0 1 2 3 4 (d) q = 10 ; l = 13 r Entanglement measure