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

• Kawamura, Seiji

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.

Journal

• Physics Letters A

  Physics Letters A 384 (26), 126626-, 2020-09-18

  Elsevier

Keywords

• Gravitational wave
• DECIGO
• Quantum locking
• Squeezing
• Completing the square
• Fabry-Perot cavity

Details

• CRID: 1050008613567325184
• NII Article ID: 120006948915
• DOI: 10.1016/j.physleta.2020.126626
• HANDLE: 2237/00033235
• ISSN: 03759601
• Web Site: https://nagoya.repo.nii.ac.jp/records/31054
• Web Site: https://api.elsevier.com/content/article/PII:S037596012030493X?httpAccept=text/xml
• Web Site: https://api.elsevier.com/content/article/PII:S037596012030493X?httpAccept=text/plain
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN