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We investigate the influence of laser phase noise heating on resolvedsideband cooling in the context of cooling the center-of-mass motion of alevitated nanoparticle in a high-finesse cavity. Although phase noise heatingis not a fundamental physical constraint, the regime where it becomes the mainlimitation in Levitodynamics has so far been unexplored and hence embodies fromthis point forward the main obstacle in reaching the motional ground state oflevitated mesoscopic objects with resolved sideband cooling. We reach minimalcenter-of-mass temperatures comparable to $T_{min}=10$mK at a pressure of $p =3\times 10^{-7}$mbar, solely limited by phase noise. Finally we presentpossible strategies towards motional ground state cooling in the presence ofphase noise.

Resolved Sideband Cooling of a Levitated Nanoparticle in the Presence of Laser Phase Noise