各位老师和同学：
实验室于本周四上午（元月24日）安排了两个学术报告，请相互转告并准时参加。
报告地点：三楼会议室
两个学术报告内容分别如下：
一、报告人：杨峤立副教授
报告题目：WIMPs介绍
报告简介：WIMPs(弱作用重粒子）是一种非常受到关注的暗物质候选粒子，报告将介绍WIMPs粒子的理论动机。
报告时间：8:30-10:00（AM）
二、报告人：赵春农研究员（西澳大学，Australian International Gravitational Research Centre）
报告时间：10:00-12:00（AM）
报告题目：Frequency-dependent squeezing via optomechanical interaction
报告简介：
The future gravitational wave detectors are expected to be limited by the quantum noise in the detection band. At low frequencies, the dominant quantum noise is the quantum radiation-pressure noise arising from quantum fluctuation of the light amplitude; at high frequencies, the shot noise from phase fluctuation is the dominant. The squeezed vacuum injection is one of several methods proposed to reduce the quantum noise, which has been demonstrated on the first generation detectors to reduce the shot noise limit in the high frequency detection band. In order to achieve the broadband quantum noise reduction, it is required the squeezing angle rotation at different frequencies, so-called frequency-dependent squeezing. The frequency-dependent squeezing can be realized by filtering the squeezed vacuum through a series of low loss optical cavities. However, the filtering cavity linewidth should be comparable to the detector detection bandwidth, i.e. 100 Hz. The long baseline and high finesse optical cavity was the initial choice. Alternatively, the narrow-band dispersion created by electromagnetic induced transparency (EIT) in atomic system inside the optical cavity was proposed to effectively increase the cavity storage time and the cavity effective linewidth. This makes the tabletop narrow-band filtering cavity achievable. However, a typical atomic system is generally quite lossy and the narrow-band dispersion is accompanied by a strong absorption (high loss). This configuration is still in research. Here, we propose to achieve a narrow-band filtering cavity via optomechanical interaction, in which the optomechanical-induced transparency (OMIT) increases the cavity storage time and creates a very narrow effective cavity linewidth with a very compact configuration.
报告人简介：
· 2009 – present, Research Associated Professor, University of Western Australia
· 2005 – 2009, Senior Research Fellow, University of Western Australia
· 2002 – 2005, Research Fellow, Edith Cowan University.
· 2000 – 2002. System Engineer, University of Western Australia.
· 1999 – 2000, Post-Doc, Max-Planck-Institute for Quantum Optics, Garching, Germany
· 1995-1999， PhD， University of Western Australia
