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We report an experimental observation of a record-breaking ultra-highrotation frequency about 6 GHz in an optically levitated nanoparticle system.We optically trap a nanoparticle in the gravity direction with a high numericalaperture (NA) objective lens, which shows significant advantages incompensating the influences of the scattering force and the photophoretic forceon the trap, especially at intermediate pressure (about 100 Pa). This allows usto trap a nanoparticle from atmospheric to low pressure ($10^{-3}$ Pa) withoutusing feedback cooling. We measure a highest rotation frequency about 4.3 GHzof the trapped nanoparticle without feedback cooling and a 6 GHz rotation withfeedback cooling, which is the fastest mechanical rotation ever reported todate. Our work provides useful guides for efficiently observing hyperfastrotation in the optical levitation system, and may find various applicationssuch as in ultrasensitive torque detection, probing vacuum friction, andtesting unconventional decoherence theories.

6 GHz hyperfast rotation of an optically levitated nanoparticle in vacuum