Test Of Continuous Spontaneous Localization Model At Room Temperature Using Magneto-gravitational Levitated System

While quantum mechanics has achieved great success,there are still some controversies,such as measurement problem.Collapse model is one of the most important theories to solve these problems.For years,physicists have put forward many different versions of collapse model and the Continuous Spontaneous Localization(CSL)model is one of them.The CSL model predicts the collapse of the wave function via a weak stochastic force acting on physical systems,which leads a tiny change of energy at the same time.To detect this force,researchers have proposed many experimental schemes.Mechanical oscillators are a natural way to test such a force;in particular levitated micro-mechanical oscillator has been recently proposed to be an ideal system.We report a new system which uses static magnetic field to levitate micro droplets in high vacuum to detect the energy,meanwhile the principle of this scheme is verified by experiments.Due to the ultra-low noise and mechanical dissipation,there is a great potential in this area and the oscillator provides a new upper bound on the CSL collapse rate,which gives an improvement of two orders of magnitude over the previous bounds in the same frequency range,and partially reaches the enhanced collapse rate suggested by Adler.Although being performed at room temperature,our experiment has already exhibits advantages over those operating at low temperatures previously reported.Our results experimentally show the potential of magneto-gravitational levitated mechanical oscillator as a promising method for testing collapse model.Further improvements in cryogenic experiments are discussed.