标题： 用10分贝压缩光增强检测非反射表面的振动 显示英文标题

标题： Sensing the vibration of non-reflective surfaces with 10-dB-squeezed-light enhancement

摘要： 具有压缩量子不确定性的激光光是一种用于干涉传感的强大工具。 常规应用可以在引力波观测站中找到。 只有当大部分光子被实际测量时，才能实现显著的量子优势。 因此，迄今为止，对强吸收或散射表面的量子增强振动测量并未被考虑。 在这里，我们通过测量空气压力波而不是直接测量表面振动，展示了空气中表面振动频率特性的强量子增强测量。 我们的压缩激光束只需穿过振动表面，其灵敏度在相同配置下，超稳定传统光束需要十倍功率才能达到。 仅0.12 mPa/ Hz的超声波压力幅度在毫米级空间分辨率和1 kHz分辨率带宽下清晰可见。 我们设想在传感器技术中的应用，其中需要在有限的、例如眼安全的光功率下测量远处、高度吸收或光学不可达的空气中表面振动。 显示英文摘要

摘要： Laser light with squeezed quantum uncertainty is a powerful tool for interferometric sensing. A routine application can be found in gravitational wave observatories. A significant quantum advantage is only achievable if a large fraction of the photons are actually measured. For this reason, quantum-enhanced vibrational measurements of strongly absorbing or scattering surfaces have not been considered so far. Here we demonstrate the strongly quantum-enhanced measurement of the frequency characteristics of surface vibrations in air by measuring the air pressure wave instead. Our squeezed laser beam, which simply passes the vibrating surface, delivers a sensitivity that an ultra-stable conventional light beam in the same configuration can only achieve with ten times the power. The pressure amplitude of a ultrasonic wave of just 0.12 mPa/ Hz was clearly visible with a spatial resolution in the millimetre range and a 1 kHz resolution bandwidth. We envision applications in sensor technology where distant, highly absorbing or optically inaccessible surface vibrations in air are to be measured with limited, e.g. eye-safe, light powers.