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Optimization of quantum noise by completing the square of multiple interferometer outputs in quantum locking for gravitational wave detectors

Yamada, Rika, Enomoto, Yutaro, Nishizawa, Atsushi, Nagano, Koji, Kuroyanagi, Sachiko, Kokeyama, Keiko, Komori, Kentaro, Michimura, Yuta, Naito, Takeo, Watanabe, Izumi, Morimoto, Taigen, Ando, Masaki, Furusawa, Akira and Kawamura, Seiji 2020. Optimization of quantum noise by completing the square of multiple interferometer outputs in quantum locking for gravitational wave detectors. Physics Letters A 384 (26) , 126626. 10.1016/j.physleta.2020.126626
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Abstract

The quantum locking technique, which uses additional short low-loss sub-cavities, is effective in reducing quantum noise in space gravitational wave antenna DECIGO. However, the quantum noise of the main interferometer depends on the control systems in the sub-cavities. Here we demonstrate a new method to optimize the quantum noise independently of the feedback gain by completing the square of multiple interferometer outputs in the quantum locking system. We successfully demonstrate in simulations that this method is effective in optimizing the homodyne angle to the best quantum-noise-limited sensitivity.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Elsevier
ISSN: 0375-9601
Date of First Compliant Deposit: 19 March 2021
Date of Acceptance: 27 May 2020
Last Modified: 22 Mar 2021 12:00
URI: http://orca.cf.ac.uk/id/eprint/139922

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