Generation and application of strongly squeezed vacuum states of light

压缩真空态的光已被用于各种证明原理的实验，以减少光子计数噪声(散粒噪声)。在德国汉诺威的引力波探测器GEO600上，压缩光在量子计量学中的第一次长期应用已经进行了两年多。这一成功的压缩光应用证明了S的普遍重要性，但也表明了在更简单、更可靠的压缩光源装置中产生更高压缩能级的需求。本项目提出在一种新型驻波双共振压缩谐振腔中产生波长为1064 nm的压缩真空态。这种拓扑预计将提供从音频频段到MHz边带频率的前所未有的高压缩级别，并显著减少产生强压缩所需的光学组件数量。因此，提议的压缩光源的高可靠性似乎是现实的。此外，我们还提出了将产生的强压缩态应用于非经典激光干涉测量的两个重要方面。首先，在直接测量中，将利用强压缩态来确定光电二极管的绝对量子效率。这种基于非经典光的测量技术的测量精度将超过经典的(相对)测量精度，对于在许多应用中提高压缩光的探测效率具有重要的意义。其次，将利用压缩光来演示首次超过量子极限的非经典光增强激光功率稳定实验。

Squeezed vacuum states of light have been used in a variety of proof-of-principle experiments to reduce the photon counting noise (shot noise). The first long-term application of squeezed-light in quantum metrology has been ongoing since more than two years now in the gravitational wave detector GEO600, Hannover, Germany. This successful squeezed-light application has proven it´s general importance but also indicates the demand for higher generated squeezing levels produced in a less complex and therefore more reliable squeezed-light source setup.This project proposes the generation of squeezed vacuum states of light at a wavelength of 1064nm in a novel standing-wave doubly-resonant squeezing resonator. This topology is expected to provide unprecedented high squeezing levels ranging from audio-band frequencies up to MHz-sideband frequencies with a significantly reduced number of optical components required for the strong squeezing generation. As a consequence, a high reliability of the proposed squeezed light source seems realistic. Furthermore, we propose the application of the generated strongly squeezed states to two important aspects of non-classical laser interferometry. Firstly, the strongly squeezed states will be employed to determine the absolute quantum efficiency of photo diodes in a direct measurement. The precision of this measurement technique based non-classical light will beat the classical (relative) measurement accuracy and will give important insights for a high detection efficiency of squeezed light in many applications. Secondly, squeezed light will be used to demonstrate a non-classical light enhanced laser power stabilization experiment surpassing the quantum limit for the first time.