Approaching the motional ground state of a 10-kg object

The motion of a mechanical object -- even human-sized should be governed by the rules quantum mechanics. Coaxing them into state is, however, difficult: thermal environment masks any signature object's motion. Indeed, also effects proposed modifications mechanics at large mass scales. We prepare center-of-mass 10 kg oscillator in with an average phonon occupation 10.8. reduction temperature, from room temperature to 77 nK, is commensurate 11 orders-of-magnitude suppression back-action feedback and 13 increase prepared close its motional ground state. This begets possibility probing gravity on massive systems.