Introduction of Vacuum Fields to Cavity with Diffraction Loss

[2505.04630] Quantum Noise from Vacuum Field Injection in Optical Cavities with Diffraction-related Loss Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Physics > Optics arXiv:2505.04630 (physics) [Submitted on 22 Apr 2025 ( v1 ), last revised 10 May 2026 (this version, v3)] Title: Quantum Noise from Vacuum Field Injection in Optical Cavities with Diffraction-related Loss Authors: Kurumi Umemura , Tomohiro Ishikawa , Kenji Tsuji , Shoki Iwaguchi , Yutaro Enomoto , Yuta Michimura , Kentaro Komori , Keiko Kokeyama , Seiji Kawamura View a PDF of the paper titled Quantum Noise from Vacuum Field Injection in Optical Cavities with Diffraction-related Loss, by Kurumi Umemura and 8 other authors View PDF HTML (experimental) Abstract: The space-based gravitational wave detector DECIGO is designed to observe primordial gravitational waves with 1,000 km Fabry-Perot cavities. Its sensitivity is limited by quantum noise, and although squeezing can suppress it, its effectiveness is reduced by diffraction-related loss, which leads to the injection of vacuum fields into the interferometer. This paper presents a rigorous treatment of quantum field propagation in the presence of diffraction and higher-order mode losses, deriving input-output relations, and modeling their impact via an optomechanical block diagram. The analysis shows that diffraction-induced vacuum fields slightly increase radiation pressure noise, while shot noise remains unaffected. Nevertheless, cavity detuning with homodyne detection yields a dip in the noise spectrum. By accurately capturing these effects, this framework enables a detailed study of sensitivity improvements made by either just detuning the main cavity while implementing homodyne detection, or by combining this with optical-spring quantum locking using auxiliary cavities, laying a firm foundation for enhancing DECIGO's capability to detect primordial gravitational waves. Comments: 11 pages, 7 figures, Kurumi Umemura, Tomohiro Ishikawa and Kenji Tsuji contributed equally to this work Subjects: Optics (physics.optics) ; General Relativity and Quantum Cosmology (gr-qc); Instrumentation and Detectors (physics.ins-det) Cite as: arXiv:2505.04630 [physics.optics] (or arXiv:2505.04630v3 [physics.optics] for this version) https://doi.org/10.48550/arXiv.2505.04630 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Kenji Tsuji [ view email ] [v1] Tue, 22 Apr 2025 14:39:03 UTC (420 KB) [v2] Fri, 10 Apr 2026 21:08:53 UTC (1,903 KB) [v3] Sun, 10 May 2026 08:39:21 UTC (1,903 KB) Full-text links: Access Paper: View a PDF of the paper titled Quantum Noise from Vacuum Field Injection in Optical Cavities with Diffraction-related Loss, by Kurumi Umemura and 8 other authors View PDF HTML (experimental) TeX Source view license Current browse context: physics.optics < prev | next > new | recent | 2025-05 Change to browse by: gr-qc physics physics.ins-det References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... 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