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  Tomographic readout of an opto-mechanical interferometer

Kaufer, H., Sawadsky, A., Westphal, T., Friedrich, D., & Schnabel, R. (2012). Tomographic readout of an opto-mechanical interferometer. New Journal of Physics, 14: 095018. doi:10.1088/1367-2630/14/9/095018.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EBC5-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EBC6-9
Genre: Journal Article

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1205.2241 (Preprint), 425KB
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 Creators:
Kaufer, Henning1, Author              
Sawadsky, Andreas, Author
Westphal, Tobias1, Author              
Friedrich, Daniel1, Author              
Schnabel, Roman1, Author              
Affiliations:
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, Physics, Optics, physics.optics
 Abstract: The quantum state of light changes its nature when being reflected off a mechanical oscillator due to the latter's susceptibility to radiation pressure. As a result, a coherent state can transform into a squeezed state and can get entangled with the motion of the oscillator. The complete tomographic reconstruction of the state of light requires the ability to readout arbitrary quadratures. Here we demonstrate such a readout by applying a balanced homodyne detector to an interferometric position measurement of a thermally excited high-Q silicon nitride membrane in a Michelson-Sagnac interferometer. A readout noise of $\unit{1.9 \cdot 10^{-16}}{\metre/\sqrt{\hertz}}$ around the membrane's fundamental oscillation mode at $\unit{133}{\kilo\hertz}$ has been achieved, going below the peak value of the standard quantum limit by a factor of 8.2 (9 dB). The readout noise was entirely dominated by shot noise in a rather broad frequency range around the mechanical resonance.

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 Dates: 2012-05-102012
 Publication Status: Published in print
 Pages: 7 pages, 5 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1205.2241
DOI: 10.1088/1367-2630/14/9/095018
 Degree: -

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Title: New Journal of Physics
  Other : New J. Phys.
Source Genre: Journal
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Publ. Info: Bristol, UK : Institute of Physics Pub.
Pages: - Volume / Issue: 14 Sequence Number: 095018 Start / End Page: - Identifier: ISSN: 1367-2630
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954926913666