AUTHOR=Lu Tian-Xiang , Chen Liu-Sha , Zhong Wo-Jun , Xiao Xing TITLE=Quantum squeezing induced nonreciprocal enhancement of optomechanical cooling JOURNAL=Frontiers in Physics VOLUME=11 YEAR=2023 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2023.1332496 DOI=10.3389/fphy.2023.1332496 ISSN=2296-424X ABSTRACT=

We theoretically propose how to achieve nonreciprocal enhancement of mechanical cooling in a compound cavity optomechanical system composed of an optomechanical resonator and a χ(2)-nonlinear resonator. By parametric pumping the χ(2)-nonlinear resonator unidirectionally with a classical coherent field, quantum squeezing of the resonator mode emerges in one direction but not in the other, resulting in asymmetric optical detuning and a tunable chiral photon interaction between two resonators. As a result, nonreciprocal mechanical cooling is achieved. More importantly, enhanced mechanical cooling deep into the ground-state can be achieved in the selected directions due to the squeezing effect. These results provide an experimentally feasible way to realize nonreciprocal ground-state cooling of mechanical resonator, which may have a wide range of applications in quantum communication and quantum technologies.