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Alignment sensing and control for squeezed vacuum states of light

Schreiber, E., Dooley, K. L., Vahlbruch, H., Affeldt, C., Bisht, A., Leong, J. R., Lough, J., Prijatelj, M., Slutsky, J., Was, M., Wittel, H., Danzmann, K. and Grote, H. 2016. Alignment sensing and control for squeezed vacuum states of light. Optics Express 24 (1) , pp. 146-152. 10.1364/OE.24.000146

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Beam alignment is an important practical aspect of the application of squeezed states of light. Misalignments in the detection of squeezed light result in a reduction of the observable squeezing level. In the case of squeezed vacuum fields that contain only very few photons, special measures must be taken in order to sense and control the alignment of the essentially dark beam. The GEO 600 gravitational wave detector employs a squeezed vacuum source to improve its detection sensitivity beyond the limits set by classical quantum shot noise. Here, we present our design and implementation of an alignment sensing and control scheme that ensures continuous optimal alignment of the squeezed vacuum field at GEO 600 on long time scales in the presence of free-swinging optics. This first demonstration of a squeezed light automatic alignment system will be of particular interest for future long-term applications of squeezed vacuum states of light.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Optical Society of America
ISSN: 1094-4087
Date of Acceptance: 14 December 2015
Last Modified: 30 Oct 2020 11:45

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