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  Interferometer readout-noise below the Standard Quantum Limit of a membrane

Westphal, T., Friedrich, D., Kaufer, H., Yamamoto, K., Gossler, S., Mueller-Ebhardt, H., et al. (2012). Interferometer readout-noise below the Standard Quantum Limit of a membrane. Physical Review A, 85: 063806. doi:10.1103/PhysRevA.85.063806.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EBD2-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EBD4-9
Genre: Journal Article

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 Creators:
Westphal, Tobias1, Author              
Friedrich, Daniel1, Author              
Kaufer, Henning1, Author              
Yamamoto, Kazuhiro1, Author              
Gossler, Stefan1, Author              
Mueller-Ebhardt, Helge1, Author              
Danilishin, Stefan L., Author
Khalili, Farid Ya., Author
Danzmann, Karsten1, Author              
Schnabel, Roman1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Physics, Optics, physics.optics,Quantum Physics, quant-ph
 Abstract: Here we report on the realization of a Michelson-Sagnac interferometer whose purpose is the precise characterization of the motion of membranes showing significant light transmission. Our interferometer has a readout noise spectral density (imprecision) of 3E-16 m/sqrt(Hz) at frequencies around the fundamental resonance of a SiN_x membrane at about 100 kHz, without using optical cavities. The readout noise demonstrated is more than 16 dB below the peak value of the membrane's standard quantum limit (SQL). This reduction is significantly higher than those of previous works with nano-wires [Teufel et al., Nature Nano. 4, 820 (2009); Anetsberger et al., Nature Phys. 5, 909 (2009)]. We discuss the meaning of the SQL for force measurements and its relation to the readout performance and conclude that neither our nor previous experiments achieved a total noise spectral density as low as the SQL.

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 Dates: 2011-11-302012
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1111.7236
DOI: 10.1103/PhysRevA.85.063806
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Title: Physical Review A
  Other : Phys. Rev. A
Source Genre: Journal
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Publ. Info: New York, NY : Published by the American Physical Society through the American Institute of Physics
Pages: - Volume / Issue: 85 Sequence Number: 063806 Start / End Page: - Identifier: ISSN: 1050-2947
CoNE: /journals/resource/954925225012_2