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Optomechanical systems provide a pathway for the bidirectionaloptical-to-microwave interconversion in (quantum) networks. We demonstrate theimplementation of this functionality and non-adiabatic optomechanical controlin a single, $\mu$m-sized potential trap for phonons and exciton-polaritoncondensates in a structured semiconductor microcavity. The exciton-enhancedoptomechanical coupling leads to self-oscillations (phonon lasing) -- thusproving reversible photon-to-phonon conversion. We show that these oscillationsare a signature of the optomechanical strong coupling signalizing the emergenceof elusive phonon-exciton-photon quasiparticles -- the phonoritons. We thendemonstrate full control of the phonoriton spectrum as well as coherentmicrowave-to-photon interconversion using electrically generated GHz-vibrationsand a resonant optical laser beam. These findings establish thezero-dimensional polariton condensates as a scalable coherent interface betweenmicrowave and optical domains with enhanced microwave-to-mechanical andmechanical-to-optical coupling rates.

Microcavity phonoritons -- a coherent optical-to-microwave interface