高Q值扭摆系统的经典与量子噪声极限研究

项目名称： 高Q值扭摆系统的经典与量子噪声极限研究

项目编号： No.11275075

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 邵成刚

作者单位： 华中科技大学

项目金额： 72万元

中文摘要： 精密扭摆作为一种高灵敏度的弱力检测工具，已被广泛应用于引力和电磁力等弱力的精密测量以及对现有基本物理定律和物理规律的实验检验中。本项目拟围绕精密扭摆系统的经典噪声与量子噪声极限问题开展研究。在引力实验中，量子噪声的理论已成功应用于棒状、球状引力波天线和小质量的微谐振子系统，但并未应用于扭摆系统。主要原因是目前常用扭摆系统的经典噪声仍远高于量子噪声，但随着高Q值、低温与隔振技术的发展，扭摆的经典与量子噪声的差距正逐步缩小。高Q值扭摆极易受到外部环境和测量系统的干扰，本项目拟针对引力实验中常用的高Q值扭摆，从经典到量子层次逐步研究其在外部环境和测量系统干扰下的各种噪声问题，给出高Q值扭摆系统的经典与量子噪声极限公式。结合现有的实验技术条件，提出相应的量子测量方案，使得基于扭摆弱力测量系统的噪声能够接近或到达量子噪声极限。

中文关键词： 扭摆系统；光机控制；噪声分析；；

英文摘要： As a basic tool for weak force test, the high sensitive torsion pendulum was widely used in modern gravitational and electromagnetical experiments, as well as in the experiments for test of fundamental physical laws. This project will study the classical and quantum noise limit of high sensitive torsion pendulum. Although the theory of the quantum noise has been successfully applied to some gravitational experiments, such as the gravitational wave detection with Weber bar, and searching for feeble effects with micro harmonic oscillator system, the quantum noise of the torsion pendulum has not been considered in most gravitational experiments, where the classical noise is still much larger than the quantum noise. However, as the development of high Q, low temperature and vibration isolation techniques, the gap between the classical and quantum noise in torsion pendulum is narrowing. The high sensitive torsion pendulum is usually affected easily by the outer electromagnetic field and measurement system. This project will study the general noise disturbance of the torsion pendulum with high Q from the classical to the quantum noise in the disturbance of measurement system and the external environment. We will also give the mathematical formulas of classical and quantum noise limit of torsion pendulum, and show on h

英文关键词： torsion pendulum system；optomechanical control；noise analysis；；