Reconfigurable MDI-QKD and BB84 over 20 km optical channels via EOM-tailored weak coherent states
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Quantum Physics arXiv:2606.10306 (quant-ph) [Submitted on 9 Jun 2026] Title:Reconfigurable MDI-QKD and BB84 over 20 km optical channels via EOM-tailored weak coherent states Authors:Jaesung Lim, Yonggi Jo, Nam Hun Park, Zaeill Kim, Yong Sup Ihn View a PDF of the paper titled Reconfigurable MDI-QKD and BB84 over 20 km optical channels via EOM-tailored weak coherent states, by Jaesung Lim and 4 other authors View PDF HTML (experimental) Abstract:Measurement-device-independent quantum key distribution (MDI-QKD) is designed to eliminate detector side-channel vulnerabilities. However, its practical deployment remains experimentally demanding because it requires two-photon interference (TPI) between mutually phase-randomized optical states. In this study, we demonstrate a reconfigurable platform that supports both polarization encoded MDI-QKD and BB84 measurements utilizing the same optical hardware over 20 km optical fiber channels. Two mutually phase-randomized weak coherent states (WCSs) are generated from a shared continuous-wave (CW) laser via electro-optic phase modulation and subsequent etalon-based first-order sideband filtering. Channel indistinguishability is verified through Hong-Ou-Mandel (HOM) interference, combining time-resolved coincidence measurements and polarization mismatch scans, confirming a high degree of indistinguishability that robustly approaches the classical upper limit of 0.5 for WCSs. The transmitted states go through partial Bell-state measurement (BSM) to implement MDI-QKD. Here, the sytem can be directly reconfigured for BB84 simply by rotatinga single half-wave plate (HWP) by 22.5 degree in one arm of the module. This seamless reconfiguration drastically reduces hardware redundancy and enhances operational flexibility in dynamic network environments. These results indicate that EOM-based frequency engineering using a shared CW laser offers a highly practical route toward scalable and reconfigurable quantum communication systems. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2606.10306 [quant-ph] (or arXiv:2606.10306v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2606.10306 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Yong Sup Ihn [view email] [v1] Tue, 9 Jun 2026 01:51:18 UTC (642 KB) Full-text links: Access Paper: View a PDF of the paper titled Reconfigurable MDI-QKD and BB84 over 20 km optical channels via EOM-tailored weak coherent states, by Jaesung Lim and 4 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-06 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?)