Line Plot from Scientific Research

Phonon populations < N > with fundamental frequency Ω 0 as a function of intracavity mean power P . The measured threshold power is in good agreement with the theoretical prediction. The dots are mean values, and error bars denote ±1 s.d. of each measurement, consisting of 5 × 10 5 samples. The insets show the phonon probability distributions (i) and the phonon power spectra (ii and iii) below or above the threshold. Here n is the phonon number.

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