论文标题
基于摆的重力实验的机械参数反馈冷却
Mechanical parametric feedback-cooling for pendulum-based gravity experiments
论文作者
论文摘要
在音频波段频率上振荡的引力作用，用悬浮的摆质的质量测量，具有共振频率甚至更低。如果摆被热能或环境的地震运动激发，则测量灵敏度将降低。通常，通过地震隔离和线性阻尼可以缓解此问题，并可能与低温冷却结合使用。在这里，我们提出了重力场测量期间摆运动的机械参数冷却。我们报告了在地震噪声中占主导地位的原理证明的证明，并实现了假节运动的阻尼因子5.7。我们找到了一个模型系统，用于将机械参数反馈冷却达到基态附近的量子机械状态。我们在重力波探测器中预期的更可行的应用。
Gravitational forces that oscillate at audio-band frequencies are measured with masses suspended as pendulums that have resonance frequencies even lower. If the pendulum is excited by thermal energy or by seismic motion of the environment, the measurement sensitivity is reduced. Conventionally, this problem is mitigated by seismic isolation and linear damping, potentially combined with cryogenic cooling. Here, we propose mechanical parametric cooling of the pendulum motion during the gravitational field measurement. We report a proof of principle demonstration in the seismic noise dominated regime and achieve a damping factor of the pendulum motion of 5.7. We find a model system for which mechanical parametric feedback cooling reaches the quantum mechanical regime near the ground state. More feasible applications we anticipate in gravitational-wave detectors.
