Plots for A Generalized Schawlow-Townes Limit

This script produces the theoretical spectra and linewidth-scaling curves used to illustrate the generalized Schawlow–Townes limit and its reduction via quantum engineering in the accompanying paper. Specifically, it generates a semilog plot comparing the phase-quadrature spectra for the Schawlow–Townes limit, squeezed modes, and spin squeezing, together with a separate logarithmic plot of linewidth versus spin-squeezing factor corresponding to the inset analysis. A formatting subroutine standardizes figure appearance and exports publication-quality image files.