Loss-insensitive quantum noise reduction in a Raman amplifier with coherent feedback
Summarize this article with:
Quantum Physics arXiv:2602.22567 (quant-ph) [Submitted on 26 Feb 2026] Title:Loss-insensitive quantum noise reduction in a Raman amplifier with coherent feedback Authors:Jianmin Wang, Rong Zhu, Z. Y. Ou View a PDF of the paper titled Loss-insensitive quantum noise reduction in a Raman amplifier with coherent feedback, by Jianmin Wang and 2 other authors View PDF HTML (experimental) Abstract:A quantum amplifier usually adds extra noise inevitably through coupling to internal degrees of freedom while amplifying the signal. The introduction of quantum correlations can effectively suppress this extra noise. In this work, we utilize the established quantum correlation between the Stokes field and atomic spin waves in the Raman amplification process to feedback a portion of the Stokes field into the amplifier. This leads to a reduction in quantum noise that is independent of the feedback loss at high gain. A maximum of 6 dB noise reduction is observed. The single-path feedback amplifier is found to be sensitive to the feedback phase, a property that expands its potential for applications in quantum precision measurement, and the general concept can be extended to integrated optics and fiber optic systems. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2602.22567 [quant-ph] (or arXiv:2602.22567v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2602.22567 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Jianmin Wang [view email] [v1] Thu, 26 Feb 2026 03:16:14 UTC (500 KB) Full-text links: Access Paper: View a PDF of the paper titled Loss-insensitive quantum noise reduction in a Raman amplifier with coherent feedback, by Jianmin Wang and 2 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-02 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?)