Entanglement Entropy & Area Law

Bipartite entanglement entropy S(L) for a 1D quantum chain. Area law: S ~ const for gapped systems; S ~ (c/3)log(L) at criticality (CFT prediction).

Chain length N: 60 Coupling J: 1.00 Transverse field h: 1.00 Model:

Critical point: h = J
CFT central charge: c ≈ 1
Fit slope: —

S(L) = (c/3) ln(L) + const at QCP