Title: 腔光力系统中多个力学振子的基态冷却

Speaker: 廖洁桥 教授

廖洁桥，博士，湖南师范大学“潇湘学者”特聘教授，博士生导师，国家自然科学基金“优秀青年项目”和湖南省自然科学基金“杰出青年项目”获得者。2003年6月与2008年6月先后于湖南师范大学获得学士和博士学位；2008年7月至2016年6月先后在中国科学院理论物理研究所、香港中文大学、日本理化学研究所和美国加州大学默塞德分校从事研究工作；2016年7月入职湖南师范大学，被聘为“潇湘学者”特聘教授，入选湖南省“百人计划”。主要从事量子物理、量子光学和量子信息领域的理论研究。迄今已在Phys. Rev. Lett.、New J. Phys. 和Phys. Rev. A等刊物上发表SCI 论文40余篇。

Abstract:

The simultaneous ground-state cooling of multiple degenerate or near-degenerate mechanical modes coupled to a common cavity-field mode has become an outstanding challenge in cavity optomechanics. This is because the dark modes formed by these mechanical modes decouple from the cavity mode and prevent extracting energy from the dark modes through the cooling channel of the cavity mode. In this talk, I will introduce a universal and reliable dark-mode-breaking method to realize the simultaneous ground-state cooling of two degenerate or nondegenerate mechanical modes by introducing a phase-dependent phonon-exchange interaction, which is used to form a loop-coupled configuration. In this system, we find an asymmetrical cooling performance for the two mechanical modes and expound this phenomenon based on the nonreciprocal energy transfer mechanism, which leads to the directional flow of phonons between the two mechanical modes. We also generalize this method to cool multiple mechanical modes. The physical mechanism in this cooling scheme has general validity and this method can be extended to break other dark-mode and dark-state effects in physics.

2020-06-29 2:00PM