Laser cooling of a Planck mass object close to the quantum ground state
arXiv:2104.11648
Abstract
Quantum mechanics has so far not been tested for mechanical objects at the scale of the Planck mass . We present an experiment where a 1 mm quartz micropillar resonating at 3.6 MHz with an effective mass of 30 g is cooled to 500 mK with a dilution refrigerator, and further optomechanically sideband-cooled to an effective temperature of 3 mK, corresponding to a mode thermal occupancy of 20 phonons. This nearly 1000-fold increase in the mass of an optomechanical system with respect to previous experiments near the quantum ground state opens new perspectives in the exploration of the quantum/classical border.
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