2005/08/05 by S. L. Danilishin, F. Y. Khalili, F. Ya. Khalili
Engineering · Mathematics · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Computer science #Detector #Electrical engineering #Electronic engineering #Engineering #Geophysics and Sensor Technology #Gravitational wave #Limit (mathematics) #Mathematics #Metre #Network topology #Optics #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Sensitivity (control systems) #Topology (electrical circuits) #gr-qc
paper · pdf · doi:10.1103/physrevd.73.022002
published as Phys.Rev.D73:022002,2006 · 27 pages, 6 figures
arxiv created 2005/08/05 · openalex publication_date 2006/01/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/08
The quantum nondemolition (QND) intracavity topologies of gravitational-wave detectors proposed several years ago allow us, in principle, to obtain sensitivity significantly better than the standard quantum limit using relatively small amount of optical pumping power. In this article we consider an improved more practical version of the optical lever intracavity scheme. It differs from the original version by the symmetry which allows to suppress influence of the input light amplitude fluctuation. In addition, it provides the means to inject optical pumping inside the scheme without increase of optical losses. We consider also sensitivity limitations imposed by the local meter which is the key element of the intracavity topologies. Two variants of the local meter are analyzed, which are based on the spectral variation measurement and on the discrete sampling variation measurement, correspondingly. The former one, while can not be considered as a candidate for a practical implementation, allows, in principle, to obtain the best sensitivity and thus can be considered as an ideal ``asymptotic case'' for all other schemes. The DSVM-based local meter can be considered as a realistic scheme but its sensitivity, unfortunately, is by far not so good just due to a couple of peculiar numeric factors specific for this scheme. From our point of view search of new methods of mechanical QND measurements probably based on improved DSVM scheme or which combine the local meter with the pondermotive squeezing technique, is necessary.