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59731.0 [No comment] 25.03.2009 09:14 Released

ID: 59731.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
Squeezed-input, optical-spring, signal-recycled gravitational-wave detectors
Authors:Harms, Jan; Chen, Yanbei; Chelkowski, Simon; Franzen, Alexander; Vahlbruch, Henning; Danzmann, Karsten; Schnabel, Roman
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Physical Review D
Issue / Number:4
Sequence Number of Article:042001
Review Status:not specified
Audience:Not Specified
Abstract / Description:We theoretically analyze the quantum noise of signal-recycled laser interferometric gravitational-wave detectors with additional input and output optics, namely frequency-dependent squeezing of the vacuum entering the dark port and frequency-dependent homodyne detection. We combine the work of Buonanno and Chen on the quantum noise of signal-recycled interferometers with ordinary input-output optics, and the work of Kimble el al. on frequency-dependent input-output optics with conventional interferometers. Analytical formulas for the optimal input and output frequency dependencies are obtained. It is shown that injecting squeezed light with the optimal frequency-dependent squeezing angle into the dark port yields an improvement on the noise spectral density by a factor of exp(-2r) (in power) over the entire squeezing bandwidth, where r is the squeezing parameter. It is further shown that frequency-dependent (variational) homodyne read-out leads to an additional increase in sensitivity which is significant in the wings of the doubly resonant structure. The optimal variational input squeezing in case of an ordinary output homodyne detection is shown to be realizable by applying two optical filters on a frequency-independent squeezed vacuum. Throughout this paper, we take as example the signal-recycled topology currently being completed at the GEO600 site. However, theoretical results obtained here are also applicable to the proposed topology of Advanced LIGO.
External Publication Status:published
Document Type:Article
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Teilinstitut Hannover
MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
External Affiliations:Institut für Atom- und Molekülphysik, Universität Hannover, Callinstr. 38, 30167 Hannover, Germany
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