A Quantum-Enhanced Feedback Oscillator

Quantum Physics arXiv:2608.07753 (quant-ph) [Submitted on 7 Aug 2026] Title:A Quantum-Enhanced Feedback Oscillator Authors:Hudson A. Loughlin, Daniel M. DeSantis, Nergis Mavalvala, Vivishek Sudhir View a PDF of the paper titled A Quantum-Enhanced Feedback Oscillator, by Hudson A. Loughlin and Daniel M. DeSantis and Nergis Mavalvala and Vivishek Sudhir View PDF Abstract:Feedback oscillators, such as lasers and masers, serve as time references in modern computing, communication, and measurement. Quantum fluctuations ultimately limit their phase stability and ability to keep time precisely; in the absence of quantum engineering, their phase stability is bounded by a standard quantum limit (SQL). Techniques to improve the frequency stability of feedback oscillators beyond the SQL have been theorized, but have not yet been demonstrated. We demonstrate an opto-electronic oscillator (OEO), a type of feedback oscillator, with phase stability approaching the SQL. We then engineer the OEO's quantum state to improve its phase stability, thereby demonstrating the essential principle quantum-enhancement of feedback oscillators. Similar techniques may be employed to evade the SQL in other feedback oscillators such as masers and lasers. Comments: Subjects: Quantum Physics (quant-ph); Optics (physics.optics) Cite as: arXiv:2608.07753 [quant-ph] (or arXiv:2608.07753v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2608.07753 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Hudson Loughlin [view email] [v1] Fri, 7 Aug 2026 20:36:37 UTC (7,953 KB) Full-text links: Access Paper: View a PDF of the paper titled A Quantum-Enhanced Feedback Oscillator, by Hudson A. Loughlin and Daniel M. DeSantis and Nergis Mavalvala and Vivishek SudhirView PDFTeX Source view license Current browse context: quant-ph new | recent | 2026-08 Change to browse by: physics 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?) 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?)