FWM matrix eigenvalues: lambda = +-sqrt(delta^2+|g|^2); Gershgorin bound |lambda|<=|delta|+|g|

FWM matrix eigenvalue vs Gershgorin bound. From framework F8 (FWM gain matrix), the exact eigenvalues of M = [[delta, g], [g, -delta]] (real g) are lambda = +-sqrt(delta^2 + g^2). The Gershgorin bound gives |lambda| <= |delta| + |g|.…