Derives a generalized Schawlow-Townes linewidth limit for feedback oscillators that can be saturated by bad-cavity devices or surpassed via quantum engineering such as atomic spin squeezing.
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A Generalized Schawlow-Townes Limit
Derives a generalized Schawlow-Townes linewidth limit for feedback oscillators that can be saturated by bad-cavity devices or surpassed via quantum engineering such as atomic spin squeezing.