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  Long-term stable squeezed vacuum state of light for gravitational wave detectors

Khalaidovski, A., Vahlbruch, H., Lastzka, N., Graef, C., Danzmann, K., Grote, H., et al. (2012). Long-term stable squeezed vacuum state of light for gravitational wave detectors. Classical and quantum gravity, 29(7): 075001. doi:10.1088/0264-9381/29/7/075001.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-4C55-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-4C56-6
Genre: Journal Article

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1109.3731 (Preprint), 961KB
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 Creators:
Khalaidovski, Alexander1, Author              
Vahlbruch, Henning1, Author              
Lastzka, Nico1, Author              
Graef, Christian1, Author              
Danzmann, Karsten1, Author              
Grote, Hartmut1, Author              
Schnabel, Roman1, Author              
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1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24010              

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Free keywords: Quantum Physics, quant-ph
 Abstract: Currently, the German/British gravitational wave detector GEO600 is being upgraded in course of the GEO-HF program. One part of this upgrade consists of the integration of a squeezed light laser to nonclassically improve the detection sensitivity at frequencies where the instrument is limited by shot noise. This has been achieved recently [1]. The permanent employment of squeezed light in gravitational wave observatories requires a long-term stability of the generated squeezed state. In this paper, we discuss an unwanted mechanism that can lead to a varying squeezing factor along with a changing phase of the squeezed field. We present an extension of the implemented coherent control scheme [2] that allowed an increase in the long-term stability of the GEO600 squeezed light laser. With it, a quantum noise reduction by more than 9 dB in the frequency band of 10 Hz - 10 kHz was observed over up to 20 hours with a duty cycle of more than 99%.

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 Dates: 2011-09-162012
 Publication Status: Published in print
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 Identifiers: arXiv: 1109.3731
DOI: 10.1088/0264-9381/29/7/075001
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Title: Classical and quantum gravity
Source Genre: Journal
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Publ. Info: Bristol, U.K. : Institute of Physics
Pages: - Volume / Issue: 29 (7) Sequence Number: 075001 Start / End Page: - Identifier: ISSN: 0264-9381
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954925513480_1