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  Balanced Homodyne Detection of Optical Quantum States at Audio-Band Frequencies and Below

Stefszky, M. S., Mow-Lowry, C. M., Chua, S. S. Y., Shaddock, D. A., Buchler, B. C., Vahlbruch, H., et al. (2012). Balanced Homodyne Detection of Optical Quantum States at Audio-Band Frequencies and Below. Classical and quantum gravity, 29(14): 145015. doi:10.1088/0264-9381/29/14/145015.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-B172-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-B174-A
Genre: Journal Article

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Stefszky, M. S., Author
Mow-Lowry, C. M., Author
Chua, S. S. Y., Author
Shaddock, D. A., Author
Buchler, B. C., Author
Vahlbruch, H.1, Author              
Khalaidovski, A.1, Author              
Schnabel, R.1, Author              
Lam, P. K., Author
McClelland, D. E., Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Quantum Physics, quant-ph, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Physics, Instrumentation and Detectors, physics.ins-det
 Abstract: The advent of stable, highly squeezed states of light has generated great interest in the gravitational wave community as a means for improving the quantumnoise- limited performance of advanced interferometric detectors. To confidently measure these squeezed states, it is first necessary to measure the shot-noise across the frequency band of interest. Technical noise, such as non-stationary events, beam pointing, and parasitic interference, can corrupt shot-noise measurements at low Fourier frequencies, below tens of kilo-Hertz. In this paper we present a qualitative investigation into all of the relevant noise sources and the methods by which they can be identified and mitigated in order to achieve quantum noise limited balanced homodyne detection. Using these techniques, flat shot-noise down to Fourier frequencies below 0.5 Hz is produced. This enables the direct observation of large magnitudes of squeezing across the entire audio-band, of particular interest for ground-based interferometric gravitational wave detectors. 11.6 dB of shot-noise suppression is directly observed, with more than 10 dB down to 10 Hz.

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 Dates: 2012-05-142012
 Publication Status: Published in print
 Pages: 16 pages, 11 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1205.3229
DOI: 10.1088/0264-9381/29/14/145015
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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 (14) Sequence Number: 145015 Start / End Page: - Identifier: ISSN: 0264-9381
CoNE: /journals/resource/954925513480_1