Poled-fibre phase modulator for efficient high-dimensional quantum measurements

Quantum Physics arXiv:2608.04112 (quant-ph) [Submitted on 4 Aug 2026] Title:Poled-fibre phase modulator for efficient high-dimensional quantum measurements Authors:Nayda Guerrero, Nelson Villalba, Gustavo H. dos Santos, Carlos J. Salazar, Cristobal Melo, Fernando Castillo, Jaime Cariñe, Guilherme B. Xavier, Esteban S. Gómez, Stephen P. Walborn, João Pereira, Gabriel Saavedra, Gustavo Lima View a PDF of the paper titled Poled-fibre phase modulator for efficient high-dimensional quantum measurements, by Nayda Guerrero and 12 other authors View PDF HTML (experimental) Abstract:Efficient detection of quantum states underpins advanced device-independent quantum-information protocols that provide the ultimate level of security for tasks including quantum random number generation and quantum key distribution (QKD). High-dimensional encoding is a natural route to boost the performance of such protocols, offering enhanced noise resilience and higher information capacity, yet their practical implementation remains challenging. A key experimental bottleneck in higher dimensions is the typical need of active modulators for basis selection, which incur substantial optical losses and polarization-sensitive operation. Poled optical fiber phase modulators (PFPMs) are a fiber-native electro-optic technology that naturally addresses these challenges, combining sub-dB insertion loss, intrinsic polarization independence, and direct compatibility with standard telecommunications fiber. Here we report the first use of a PFPM for active quantum-state measurements in a fully fiber-integrated platform. Basis selection in our receiver for four-dimensional qudits is achieved using a single PFPM, substantially simplifying the receiver architecture. As a benchmark, we perform a four-dimensional QKD session and obtain a finite secret-key rate per pulse that, to the best of our knowledge, surpasses all previously reported QKD demonstrations. Our results establish poled-fiber electro-optic modulation as a broadly applicable platform for high-efficiency detection in fiber-integrated quantum information processing. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.04112 [quant-ph] (or arXiv:2608.04112v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2608.04112 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Gustavo Dos Santos [view email] [v1] Tue, 4 Aug 2026 18:06:35 UTC (4,196 KB) Full-text links: Access Paper: View a PDF of the paper titled Poled-fibre phase modulator for efficient high-dimensional quantum measurements, by Nayda Guerrero and 12 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-08 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?)