Fig. 3: Pure and amplified conversion. | Nature Communications

Fig. 3: Pure and amplified conversion.

From: Converting microwave and telecom photons with a silicon photonic nanomechanical interface

Fig. 3

a Measured total transduction efficiency ζ: = SeoSoe with respect to pump detuning Δo of the nonsideband resolved optical cavity for a constant intracavity photon number nd,o = 0.185. b Pure and—in the absence of thermal noise—noiseless conversion θ (green dots) as well as the total conversion gain \({\mathcal{G}}\) (blue dots) that gives rise to amplified vacuum noise. θ is extracted from (a) by dividing the measured total transduction by the calculated gain using Supplementary Eqs. (16) and (17). While \({{\mathcal{G}}}_{{\rm{o}}}\) diverges for Δo → 0, the optomechanical damping rate drops to zero and leads to a vanishing pure conversion θ. The arrows in both panels indicate the detuning used in Figs. 2 and 4.

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