Enhancing ground-state cooling of center-of-mass motions via quantum squeezing from magnon nonlinearity
Cooling massive oscillators to quantum ground state is an essential prerequisite for their precise control, quantum memory, and quantum ultrasensitive measurement, etc. In a cavity-magnomechanical system, the magnon-mechanical coupling, enhanced by microwave cavity driving, can be utilized to cool the center-of-mass motion of a levitated magnetic sphere. In this work, we report that the cooling performance can be further improved by exploiting quantum squeezing stemming from magnonic self-Kerr nonlinearity inherent to the ferrimagnetic yttrium-iron-garnet (YIG) sphere. By means of suitable pump driving, the Kerr nonlinearity is converted into quantum squeezing, yielding considerable enhancement of the center-of-mass cooling with properly chosen optimal parameters. Moreover, we demonstrate that this improvement mechanism for cooling the massive magnetic sphere still works even in the unresolved-sideband regime where the mechanical frequency is smaller than the magnon decay rate. Eventually, we quantify the powers of the driving pumps for practical implementation of our scheme in a typical system. Our findings may provide a novel way to quantum fundamental researches and technologies.