Photodiode quantum efficiency for 2-{\mu}m light in the signal band of gravitational wave detectors

Quantum Physics arXiv:2511.05961 (quant-ph) [Submitted on 8 Nov 2025] Title:Photodiode quantum efficiency for 2-μm light in the signal band of gravitational wave detectors Authors:Julian Gurs, Nils Sueltmann, Christian Darsow-Fromm, Sebastian Steinlechner, Roman Schnabel View a PDF of the paper titled Photodiode quantum efficiency for 2-{\mu}m light in the signal band of gravitational wave detectors, by Julian Gurs and 4 other authors View PDF HTML (experimental) Abstract:Quantum technologies with quantum correlated light require photodiodes with near-perfect `true' quantum efficiency, the definition of which adequately accounts for the photodiode dark noise. Future squeezed-light-enhanced gravitational wave detectors could in principle achieve higher sensitivities with a longer laser wavelength around 2 {\mu}m. Photodiodes made of extended InGaAs are available for this range, but the true quantum efficiency at room temperature and the low frequency band of gravitational waves is strongly reduced by dark noise. Here we characterize the change in performance of a commercial extended-InGaAs photodiode versus temperature. While the dark noise decreases as expected with decreasing temperature, the detection efficiency unfortunately also decreases monotonically. Our results indicate the need for a dedicated new design of photodiodes for gravitational wave detectors using 2-{\mu}m laser light. Subjects: Quantum Physics (quant-ph); Biological Physics (physics.bio-ph); Instrumentation and Detectors (physics.ins-det); Medical Physics (physics.med-ph); Optics (physics.optics) Cite as: arXiv:2511.05961 [quant-ph] (or arXiv:2511.05961v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2511.05961 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Dr. Roman Schnabel [view email] [v1] Sat, 8 Nov 2025 10:34:02 UTC (2,904 KB) Full-text links: Access Paper: View a PDF of the paper titled Photodiode quantum efficiency for 2-{\mu}m light in the signal band of gravitational wave detectors, by Julian Gurs and 4 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2025-11 Change to browse by: physics physics.bio-ph physics.ins-det physics.med-ph physics.optics References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) Links to Code Toggle Papers with Code (What is Papers with Code?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)