Optimization of Quantum Noise in Space Gravitational-Wave Antenna DECIGO with Optical-Spring Quantum Locking Considering Mixture of Vacuum Fluctuations in Homodyne Detection-Reference-Cited by-同舟云学术

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

Published:2023-11-09 Issue:6 Volume:11 Page:111
ISSN:2075-4434
Container-title:Galaxies
language:en
Short-container-title:Galaxies

Author:

Tsuji Kenji¹^ORCID,Ishikawa Tomohiro¹^ORCID,Komori Kentaro²³,Nagano Koji⁴,Enomoto Yutaro⁵^ORCID,Michimura Yuta²⁶,Umemura Kurumi¹,Shimizu Ryuma¹,Wu Bin¹^ORCID,Iwaguchi Shoki¹,Kawasaki Yuki¹^ORCID,Furusawa Akira⁵⁷,Kawamura Seiji¹⁸^ORCID

Affiliation:

1. Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Aichi, Japan

2. Research Center for the Early Universe (RESCEU), School of Science, University of Tokyo, Tokyo 113-0033, Tokyo, Japan

3. Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Tokyo, Japan

4. LQUOM, Inc., Tokiwadai, Hodogaya, Yokohama 240-8501, Kanagawa, Japan

5. Department of Applied Physics, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Tokyo, Japan

6. LIGO Laboratory, California Institute of Technology, Pasadena, CA 91125, USA

7. Center for Quantum Computing, RIKEN, 2-1 Hirosawa, Wako 351-0198, Saitama, Japan

8. The Kobayashi-Masukawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya 464-8602, Aichi, Japan

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.

Funder

JSPS KAKENHI

Murata Science Foundation

Publisher

MDPI AG

Subject

Astronomy and Astrophysics

Link

https://www.mdpi.com/2075-4434/11/6/111/pdf

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