Related papers: First-step experiment in developing optical-spring quantum locking for DECIGO: sensitivity optimization for simulated quantum noise by completing the square

First-step experiment in developing optical-spring quantum locking for DECIGO: sensitivity optimization for simulated quantum noise by completing the square

URL: http://arxiv.org/abs/2211.12683v1
Date: Wed, 23 Nov 2022 03:32:10 GMT
Title: First-step experiment in developing optical-spring quantum locking for DECIGO: sensitivity optimization for simulated quantum noise by completing the square
Authors: Tomohiro Ishikawa, Yuki Kawasaki, Kenji Tsuji, Rika Yamada, Izumi Watanabe, Bin Wu, Shoki Iwaguchi, Ryuma Shimizu, Kurumi Umemura, Koji Nagano, Yutaro Enomoto, Kentaro Komori, Yuta Michimura, Akira Furusawa, Seiji Kawamura
Abstract summary: DECIGO has 1,000-km-long arm cavities mainly to detect primordial gravitational waves (PGW) at lower around 0.1 Hz. We experimentally verify one key element of the optical-spring quantum locking: sensitivity optimization by completing the square of multiple detector outputs.
Score: 1.7030294562102306
License: http://creativecommons.org/licenses/by/4.0/
Abstract: DECi-hertz Interferometer Gravitational Wave Observatory (DECIGO) is a future mission for a space-borne laser interferometer. DECIGO has 1,000-km-long arm cavities mainly to detect the primordial gravitational waves (PGW) at lower frequencies around 0.1 Hz. Observations in the electromagnetic spectrum have lowered the bounds on the upper limit of PGW energy density ($\Omega_{\rm gw} \sim 10^{-15} \to 10^{-16}$). As a result, DECIGO's target sensitivity, which is mainly limited by quantum noise, needs further improvement. To maximize the feasibility of detection while constrained by DECIGO's large diffraction loss, a quantum locking technique with an optical spring was theoretically proposed to improve the signal-to-noise ratio of the PGW. In this paper, we experimentally verify one key element of the optical-spring quantum locking: sensitivity optimization by completing the square of multiple detector outputs. This experiment is operated on a simplified tabletop optical setup with classical noise simulating quantum noise. We succeed in getting the best of the sensitivities with two different laser powers by the square completion method.

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