Sensitivity enhancement of a dispersive cavity with squeezed vacuum light injection

Abstract

The measurement sensitivity of a cavity could be enhanced for sensing applications in an anomalous dispersion condition. In this paper, we find that when injecting a squeezed vacuum light into a dispersive cavity, the sensitivity could be improved further, even beating the standard quantum limit at the detuning frequencies via controlling the dispersion condition. It is amazing that normal dispersion is superior to anomalous dispersion in improving the measurement sensitivity in the presence of a squeezed vacuum field. It implies this paper could be used to realize high-precision sensing applications.

Research progress of integrated optical gyroscope

“…Beihang University is a major research unit in the field of dispersion control [42][43][44][45][46][47][48] . In 2016, Zhang et al of Beihang University proposed using erbium-doped lithium niobate film to prepare a CROW [46] , as shown in Fig.…”