A hybrid (Al)GaAs-LiNbO3 surface acoustic wave resonator for cavity quantum dot optomechanics

A hybrid device comprising a (Al)GaAs quantum dot heterostructure and a LiNbO3 surface acoustic wave resonator is fabricated by heterointegration. High acoustic quality factors Q > 4000 are demonstrated for an operation frequency f ≈ 300 MHz. The measured large quality factor-frequency products Q × f > 10 12 ensure the suppression of decoherence due to thermal noise for temperatures exceeding T > 50 K. Frequency and position dependent optomechanical coupling of single quantum dots and resonator modes is observed.