Speedmeter scheme for gravitational-wave detectors based on EPR quantum entanglement

Knyazev, E., Danilishin, S., Hild, S. and Khalili, F.Y. (2018) Speedmeter scheme for gravitational-wave detectors based on EPR quantum entanglement. Physics Letters A, 382(33), pp. 2219-2225. (doi: 10.1016/j.physleta.2017.10.009)

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We propose a new implementation of a quantum speed meter QND measurement scheme. It employs two independent optical readouts of the interferometer test masses with different values of the bandwidths and of the optical circulating power, whose outputs have to be combined by an additional beamsplitter. Signals at the two outputs of the beamsplitter are proportional to the position and the velocity of the test masses, respectively. The influence of the position meter-like back action force associated with the position signal can be cancelled using the EPR approach by measuring the amplitude quadrature of the beamsplitter common output.

Item Type:Articles
Additional Information:This work was supported by the European Research Council Starter Grants program ERC-2012-StG:307245 and by the Royal Society International Exchanges Scheme Grant IE160125. The work of E.K. and F.K. was supported by Russian Foundation for Basic Research Grants 14-02-00399 and 16-52-10069. The work of F.K. was also supported by LIGO National Science Foundation Grant PHY-1305863. S.D. was supported by the Lower Saxonian Ministry of Science and Culture within the frame of “Research Line” (Forschungslinie) QUANOMET – Quantum – and Nano-Metrology. The paper has been assigned LIGO document number LIGOP1600351.
Glasgow Author(s) Enlighten ID:Hild, Professor Stefan and Danilishin, Dr Stefan
Authors: Knyazev, E., Danilishin, S., Hild, S., and Khalili, F.Y.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physics Letters A
ISSN (Online):1873-2429
Published Online:18 October 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Physics Letters A 382(33):2219-2225
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
731731Improving low-frequency sensitivity of the future gravitational-wave detectorsStefan HildThe Royal Society (ROYSOC)IE160125S&E P&A - PHYSICS & ASTRONOMY
713721Investigations in gravitational radiationSheila RowanScience & Technology Facilities Council (STFC)ST/N005422/1S&E P&A - PHYSICS & ASTRONOMY