Optimization of Quantum Noise in Space Gravitational-Wave Antenna DECIGO with Optical-Spring Quantum Locking Considering Mixture of Vacuum Fluctuations in Homodyne Detection

IF 3.2 Q2 ASTRONOMY & ASTROPHYSICS Galaxies Pub Date : 2023-11-09 DOI:10.3390/galaxies11060111

Kenji Tsuji, Tomohiro Ishikawa, Kentaro Komori, Koji Nagano, Yutaro Enomoto, Yuta Michimura, Kurumi Umemura, Ryuma Shimizu, Bin Wu, Shoki Iwaguchi, Yuki Kawasaki, Akira Furusawa, Seiji Kawamura

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Abstract

Quantum locking using optical spring and homodyne detection has been devised to reduce the quantum noise that limits the sensitivity of the DECIGO, a space-based gravitational-wave antenna in the frequency band around 0.1 Hz for the detection of primordial gravitational waves. The reduction in the upper limit of energy density ΩGW from 2×10−15 to 1×10−16, as inferred from recent observations, necessitates improved sensitivity in the DECIGO to meet its primary science goals. To accurately evaluate the effectiveness of this method, this paper considers a detection mechanism that takes into account the influence of vacuum fluctuations on homodyne detection. In addition, an advanced signal processing method is devised to efficiently utilize signals from each photodetector, and design parameters for this configuration are optimized for the quantum noise. Our results show that this method is effective in reducing quantum noise, despite the detrimental impact of vacuum fluctuations on its sensitivity.

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考虑空差探测中真空波动混合的空间引力波天线DECIGO中量子噪声的优化

使用光学弹簧和纯差探测的量子锁定已经被设计出来，以减少量子噪声，这些噪声限制了DECIGO的灵敏度，DECIGO是一种用于探测原始引力波的0.1 Hz左右频段的天基引力波天线。从最近的观测推断，能量密度上限ΩGW从2×10−15降低到1×10−16，需要提高DECIGO的灵敏度，以实现其主要科学目标。为了准确地评价该方法的有效性，本文考虑了一种考虑真空波动对纯差检测影响的检测机制。此外，设计了一种先进的信号处理方法来有效地利用来自每个光电探测器的信号，并针对量子噪声优化了这种配置的设计参数。我们的研究结果表明，尽管真空波动对其灵敏度有不利影响，但这种方法可以有效地降低量子噪声。

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来源期刊

Galaxies Physics and Astronomy-Astronomy and Astrophysics

CiteScore

4.90

自引率

12.00%

发文量

100

审稿时长

11 weeks

期刊介绍： Es una revista internacional de acceso abierto revisada por pares que proporciona un foro avanzado para estudios relacionados con astronomía, astrofísica y cosmología. Areas temáticas Astronomía Astrofísica Cosmología Astronomía observacional: radio, infrarrojo, óptico, rayos X, neutrino, etc. Ciencia planetaria Equipos y tecnologías de astronomía. Ingeniería Aeroespacial Análisis de datos astronómicos. Astroquímica y Astrobiología. Arqueoastronomía Historia de la astronomía y cosmología. Problemas filosóficos en cosmología.