Quantum noise cancellation in asymmetric speed metres with balanced homodyne readout

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dc.identifier.uri http://dx.doi.org/10.15488/4908
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/4951
dc.contributor.author Zhang, T.
dc.contributor.author Knyazev, E.
dc.contributor.author Steinlechner, S.
dc.contributor.author Khalili, F.Y.
dc.contributor.author Barr, B. W.
dc.contributor.author Bell, A. S.
dc.contributor.author Dupej, P.
dc.contributor.author Briggs, J.
dc.contributor.author Graf, C.
dc.contributor.author Callaghan, J.
dc.contributor.author Hennig, J. S.
dc.contributor.author Houston, E. A.
dc.contributor.author Huttner, S. H.
dc.contributor.author Leavey, S.S.
dc.contributor.author Pascucci, D.
dc.contributor.author Sorazu, B.
dc.contributor.author Spencer, A.
dc.contributor.author Wright, J.
dc.contributor.author Strain, K.A.
dc.contributor.author Hild, S.
dc.contributor.author Danilishin, S.L.
dc.date.accessioned 2019-05-31T07:44:50Z
dc.date.available 2019-05-31T07:44:50Z
dc.date.issued 2018
dc.identifier.citation Zhang, T. et al.: Quantum noise cancellation in asymmetric speed metres with balanced homodyne readout. In: New Journal of Physics 20 (2018), 103040. DOI: https://doi.org/10.1088/1367-2630/aae86e
dc.description.abstract The Sagnac speed metre topology has been identified as a promising technique to reduce quantum back-action in gravitational-wave interferometers. However, imbalance of the main beamsplitter has been shown to increase the coupling of laser noise to the detection port, thus reducing the quantum noise superiority of the speed metre, compared to conventional approaches, in particular at low frequencies. In this paper, we show that by implementing a balanced homodyne readout scheme with a suitable choice of the point from which the local oscillator (LO) is derived, the excess laser noise contribution is partly compensated, and the resulting speed metre can be more sensitive than state-of-the-art position metres. This is achieved by picking-off the LO from either the reflection port of the interferometer or the anti-reflective coating surface of the main beamsplitter. We show that either approach relaxes the relative intensity noise (RIN) requirement of the input laser. For example, for a beam splitter imbalance of 0.1% in the Glasgow speed metre proof of concept experiment, the RIN requirement at frequency of 100 Hz decreases from 4 x10(-10)/root Hz to 4 x 10(-7)/root Hz, moving the RIN requirement from a value that is hard to achieve in practice, to one which is routinely obtained. eng
dc.language.iso eng
dc.publisher Bristol : IOP Publishing Ltd.
dc.relation.ispartofseries New Journal of Physics 20 (2018)
dc.rights CC BY 3.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/3.0/
dc.subject balanced homodyne detector eng
dc.subject speed metre eng
dc.subject quantum noise eng
dc.subject.ddc 530 | Physik ger
dc.title Quantum noise cancellation in asymmetric speed metres with balanced homodyne readout
dc.type article
dc.type Text
dc.relation.issn 1367-2630
dc.relation.doi https://doi.org/10.1088/1367-2630/aae86e
dc.bibliographicCitation.volume 20
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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