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  Quantum noise cancellation in asymmetric speed meters with balanced homodyne readout

Zhang, T., Knyazev, E., Steinlechner, S., Khalili, F. Y., Barr, B. W., Bell, A. S., et al. (2018). Quantum noise cancellation in asymmetric speed meters with balanced homodyne readout. New Journal of Physics, 20: 103040. doi:10.1088/1367-2630/aae86e.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-77C2-D Version Permalink: http://hdl.handle.net/21.11116/0000-0003-10CA-7
Genre: Journal Article

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Zhang, T, Author
Knyazev, E, Author
Steinlechner, S, Author
Khalili, F Ya, Author
Barr, B W, Author
Bell, A S, Author
Dupej, P, Author
Gräf, C, Author
Callaghan, J, Author
Hennig, J.-S.1, Author              
Houston, E A, Author
Huttner, S H, Author
Leavey, S S, Author
Pascucci, D, Author
Sorazu, B, Author
Spencer, A, Author
Wright, J, Author
Strain, K A, Author
Danilishin, S.1, Author              
Hild, S, 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,General Relativity and Quantum Cosmology, gr-qc
 Abstract: Sagnac speed meter (SSM) topology is known as an alternative technique to reduce quantum back-action in gravitational-wave interferometers. However, any potential imbalance of the main beamsplitter was shown to reduce the quantum noise superiority of speed meter at low frequencies, caused due to increased laser noise coupling to the detection port. In this paper, we show that implementing balanced homodyne readout scheme and for a particular choice of the local oscillator (LO) delivery port, the excess laser noise contribution to quantum noise limited sensitivity (QNLS) is partly compensated and the speed meter sensitivity can outperform state-of-the-art position meters. This can be achieved by picking the local oscillator from interferometer reflection (\textit{co-moving} LO) or the main beamsplitter anti-reflective coating surface (BSAR LO). We also show that this relaxes the relative intensity noise (RIN) requirement of the input laser. For example, for a beam splitter imbalance of $0.1 \%$ in Glasgow speed meter proof of concept experiment, the RIN requirement at frequency of 100Hz decreases from $4\times 10^{-10}/\sqrt{\rm Hz}$ to $4\times 10^{-7}/\sqrt{\rm Hz}$, moving the RIN requirement from a not practical achievable value to one which is routinely achieved with moderate effort.

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 Dates: 2018-06-142018
 Publication Status: Published in print
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 Identifiers: arXiv: 1806.05488
DOI: 10.1088/1367-2630/aae86e
URI: http://arxiv.org/abs/1806.05488
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Title: New Journal of Physics
Source Genre: Journal
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Pages: - Volume / Issue: 20 Sequence Number: 103040 Start / End Page: - Identifier: -