Optical quantum non-demolition meter for gravitational-wave detection

摘要

In this article we propose and analyze in detail the new scheme of laser interferometric gravitational-wave detector. This scheme is based on so called "intracavity" topology of gravitational-wave detectors that allows, in principle, to achieve sensitivities significantly better than the Standard Quantum Limit (SQL) using relatively small amounts of optical pumping power. The key element of any intracavity scheme is the local meter that allows to measure in a quantum non-demolition (QND) way the redistribution of optical energy inside the scheme caused by gravitational wave. Here we analyze practical design of such a meter and calculate the sensitivity limitations it imposes on the considered detector. We show that using the proposed design one is able to increase gravitational-wave detector sensitivity several times compared to the SQL. We also compare the proposed intracavity scheme with other candidates for implementation as advanced laser interferometric gravitational-wave detector and analyze advantages and disadvantages of different schemes.