论文标题
通过PT对称性相干量子反馈改善宽带灵敏度
Broadband sensitivity improvement via coherent quantum feedback with PT symmetry
论文作者
论文摘要
常规的谐振检测器通常会在带宽和峰值灵敏度之间进行权衡，这可以追溯到量子cramer-rao结合。已经证明异常分散可以通过信号扩增来改进它，因此在脱碳中更强大，而它导致不稳定性。我们提出了一个适用于以基本检测极限运行的线性系统的稳定量子放大器，这是由两种非模式非分类参数扩增启用的。在阈值下，放大器的一种模式形成了原始检测器模式的PT对称系统。显示了激光间距重力波检测器和微波腔轴测检测器的灵敏度改善。
A conventional resonant detector is often subject to a trade-off between bandwidth and peak sensitivity that can be traced back to quantum Cramer-Rao Bound. Anomalous dispersion has been shown to improve it by signal amplification and is thus more robust against decoherence, while it leads to instabilities. We propose a stable quantum amplifier applicable to linear systems operating at the fundamental detection limits, enabled by two-mode non-degenerate parametric amplification. At threshold, one mode of the amplifier forms a PT-symmetric system of original detector mode. Sensitivity improvements are shown for laser-interferometric gravitational-wave detectors and microwave cavity axion detectors.
