CaltechAUTHORS
Published January 15, 2023 | Version Published
Journal Article Open

First-step experiment for sensitivity improvement of DECIGO: Sensitivity optimization for simulated quantum noise by completing the square

Creators

  • 1. ROR icon Nagoya University
  • 2. ROR icon Institute of Space and Astronautical Science
  • 3. ROR icon University of Tokyo
  • 4. ROR icon California Institute of Technology
  • 5. ROR icon RIKEN

Abstract

Decihertz Interferometer Gravitational Wave Observatory (DECIGO) is a future mission for a space-borne laser interferometer. DECIGO has 1000-km-long arm cavities mainly to detect the primordial gravitational waves (PGWs) at lower frequencies around 0.1 Hz. Observations in the electromagnetic spectrum have lowered the bounds on the upper limit of PGWs energy density (Ω_(gw) ∼ 10⁻¹⁵ → 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 PGWs. In this paper, we experimentally verify one key element used in the theory: 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.

Additional Information

© 2023 American Physical Society. We would like to thank Dhruva Ganapathy for helpful suggestions. This work was supported by JSPS KAKENHI, Grants No. JP19H01924 and No. JP22H01247. This work was also supported by Murata Science Foundation.

Attached Files

Published - PhysRevD.107.022007.pdf

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PhysRevD.107.022007.pdf

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Additional details

Identifiers

Eprint ID
119901
Resolver ID
CaltechAUTHORS:20230308-467584400.5

Related works

Describes
10.1103/PhysRevD.107.022007 (DOI)

Funding

Japan Society for the Promotion of Science (JSPS)
JP19H01924
Japan Society for the Promotion of Science (JSPS)
JP22H01247
Murata Science Foundation

Dates

Created
2023-05-17
Created from EPrint's datestamp field
Updated
2023-05-17
Created from EPrint's last_modified field