Observation of Brillouin optomechanical strong coupling with an 11 GHz mechanical mode

Abstract

Achieving cavity-optomechanical strong coupling with high-frequency phonons provides a rich avenue for quantum technology development including quantum state-transfer, memory, and transduction, as well as enabling several fundamental studies of macroscopic phononic degrees-of-freedom. Reaching such coupling with GHz mechanical modes however has proved challenging, with a prominent hindrance being material- and surface-induced-optical absorption in many materials. Here, we circumvent these challenges and report the observation of optomechanical strong coupling to a high frequency (11 GHz) mechanical mode of a fused-silica whispering-gallery microresonator via the electrostrictive Brillouin interaction. Using an optical heterodyne detection scheme, the anti-Stokes light backscattered from the resonator is measured and normal-mode splitting and an avoided crossing are observed in the recorded spectra, providing unambiguous signatures of strong coupling. The optomechanical coupling rate reaches values as high as $G/2\pi =39\text{MHz}$ through the use of an auxiliary pump resonance, where the coupling dominates both the optical ($\kappa /2\pi =3\text{MHz}$) and the mechanical (${\gamma }_{\text{m}}/2\pi =21\text{MHz}$) amplitude decay rates. Our findings provide a promising new approach for optical quantum control using light and sound.

arXiv comment16 pages, 5 figures, includes supplementary, accepted in Optica

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• Single-Phonon Addition and Subtraction to a Mechanical Thermal State
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• Optimal estimation of time-dependent gravitational fields with quantum optomechanical systems
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