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  Fundamental quantum interferometry bound for the squeezed-light-enhanced gravitational-wave detector GEO600

Demkowicz-Dobrzanski, R., Banaszek, K., & Schnabel, R. (2013). Fundamental quantum interferometry bound for the squeezed-light-enhanced gravitational-wave detector GEO600. Physical Review A, 88: 041802(R). doi:10.1103/PhysRevA.88.041802.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-11C6-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-11C7-8
Genre: Journal Article

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 Creators:
Demkowicz-Dobrzanski, Rafal, Author
Banaszek, Konrad, 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: Quantum Physics, quant-ph, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM
 Abstract: The fundamental quantum interferometry bound limits the sensitivity of an interferometer for a given total rate of photons and for a given decoherence rate inside the measurement device.We theoretically show that the recently reported quantum-noise limited sensitivity of the squeezed-light-enhanced gravitational-wave detector GEO600 is exceedingly close to this bound, given the present amount of optical loss. Furthermore, our result proves that the employed combination of a bright coherent state and a squeezed vacuum state is generally the optimum practical approach for phase estimation with high precision on absolute scales. Based on our analysis we conclude that neither the application of Fock states nor N00N states or any other sophisticated nonclassical quantum states would have yielded an appreciably higher quantum-noise limited sensitivity.

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 Dates: 2013-05-302013
 Publication Status: Published in print
 Pages: 5 pages, 4 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1305.7268
DOI: 10.1103/PhysRevA.88.041802
URI: http://arxiv.org/abs/1305.7268
 Degree: -

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Title: Physical Review A
  Other : Phys. Rev. A
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 88 Sequence Number: 041802(R) Start / End Page: - Identifier: ISSN: 1050-2947
CoNE: /journals/resource/954925225012_2