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Preparing mechanical systems in their lowest possible entropy state, thequantum ground state, starting from a room temperature environment is a keychallenge in quantum optomechanics. This would not only enable creating quantumstates of truly macroscopic systems, but at the same time also lay thegroundwork for a new generation of quantum-limited mechanical sensors inambient environments. Laser cooling of optomechanical devices using theradiation pressure force combined with cryogenic precooling has been successfulat demonstrating ground state preparation of various devices, while a similardemonstration starting from a room temperature environment remains anoutstanding goal. Here, we combine integrated nanophotonics with phononic bandgap engineering to simultaneously overcome prior limitations in the isolationfrom the surrounding environment and the achievable mechanical frequencies, aswell as limited optomechanical coupling strength, demonstrating a single-photoncooperativity of 200. This new microchip technology allows us to feedback coola mechanical resonator to around 1 mK, near its motional ground state, fromroom temperature. Our experiment marks a major step toward accessible,widespread quantum technologies with mechanical resonators.

Feedback cooling of a room temperature mechanical oscillator close to its motional groundstate