paper

Optical noise correlations and beating the standard quantum limit in advanced gravitational-wave detectors

arXiv:gr-qc/0010011 · doi:10.1088/0264-9381/18/15/102

Abstract

The uncertainty principle, applied naively to the test masses of a laser-interferometer gravitational-wave detector, produces a Standard Quantum Limit (SQL) on the interferometer's sensitivity. It has long been thought that beating this SQL would require a radical redesign of interferometers. However, we show that LIGO-II interferometers, currently planned for 2006, can beat the SQL by as much as a factor two over a bandwidth Δf \sim f, if their thermal noise can be pushed low enough. This is due to dynamical correlations between photon shot noise and radiation-pressure noise, produced by the LIGO-II signal-recycling mirror.

12 pages, 2 figures; minor changes, some references added

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