U/κ —
g²(0) —
Blockade —
g²(0) < 1: sub-Poissonian
g²(0) = 0: perfect blockade
g²(0) = 1: coherent state
g²(0) = 0: perfect blockade
g²(0) = 1: coherent state
En = nωc + n(n−1)U/2 | Anharmonic ladder blocks two-photon absorption