标题： 腔磁机械系统中通过自克尔非线性实现的增强冷却 显示英文标题

标题： Enhanced cooling via self-Kerr nonlinearity in cavity-magnomechanical system

摘要： 将大质量振荡器冷却到量子基态是实现其精确控制和量子应用的关键步骤。 最近的研究发现，通过磁子腔耦合可以冷却悬浮磁性球体的质心运动。 在本工作中，我们证明可以通过利用磁子模式的自克尔非线性实现增强冷却，在铁磁钇铁石榴石（YIG）球体中观察到了这种非线性。 通过适当的泵浦驱动，自克尔非线性被映射到简并磁子压缩，通过优化系统参数显著增强了冷却效果。 此外，这种克尔非线性效应还在边带未分辨区域带来了增强的冷却效果，此时机械频率小于腔衰减率。 这些结果为存储方案和超灵敏测量方面的量子技术提供了新途径。 显示英文摘要

摘要： Cooling massive oscillators to quantum ground state is a key step for their precise control and quantum application. Recent work found that the center-of-mass motion of a levitated magnetic sphere can be cooled via magnon-cavity coupling. In this work, we demonstrate that a enhanced cooling can be realized by exploiting self-Kerr nonlinearity of magnon mode, observed in a ferrimagnetic yttrium-iron-garnet (YIG) sphere. By means of proper pump driving, the self-Kerr nonlinearity is mapped into degenerate magnon squeezing, leading to considerable enhancement of cooling via optimizing system parameters. Moreover, this Kerr nonlinear effect also brings enhanced cooling in the sideband-unresolved regime where the mechanical frequency is smaller than the cavity decay rate. These results provide new way to quantum technologies in terms of storage schemes and ultrasensitive measurements.