Figure 3
From: Optimal \({\mathscr{P}}{\mathscr{T}}\) -symmetric switch features exceptional point
S 0 Stokes component as a function of position \(z/{L}_{c}\) and of relative \({\mathscr{P}}{\mathscr{T}}\)-symmetric section length \(\mathrm{(2}\ell \mathrm{)/(2}{L}_{c})\), whose limits are thus the oblique lines starting at the rear corners. The line at \(\ell /{L}_{c}=0.5\) is the case of optimal gain-loss profile, conserving S 0. The exceptional point state \(|{\rm{ex}}\rangle \) ensures transit in the \(-\ell < z < \ell \) region (added white dots).
