Fig. 3: Dynamics of the correlations.

Evolution of the real part of the first-order correlation function g⁽¹⁾(τ), as a function of the time delay τ, in units of the inverse loss-gain parameter κ⁻¹ [Eq. (24)]. a–c The coupling constant g is reduced from above [a, b] to at c the exceptional point located at \(g=\kappa /(2\sqrt{2})\). The results for the first and second oscillators are denoted by the thick green and thin orange lines respectively [see the legend in c, which applies to the whole figure]. In the figure, ω₀ = 20κ.