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A Chip-Scale Transmitter Module for Real-Time Continuous-Variable QKD

arXiv Quantum Archived Mar 17, 2026 ✓ Full text saved

arXiv:2603.13483v1 Announce Type: new Abstract: Continuous-variable quantum key distribution (CV-QKD) enables secure communication over standard telecom infrastructure, yet its scaling is stalled by bulky, discrete optical hardware. We address this bottleneck by demonstrating a real-time CV-QKD system driven by a chip-scale hybrid transmitter built from commercial telecom components. By integrating a micro-optic external-cavity laser with a monolithic photonic integrated IQ modulator, we provide

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Quantum Physics [Submitted on 13 Mar 2026] A Chip-Scale Transmitter Module for Real-Time Continuous-Variable QKD Igor Servello, Martin Hauer, Moritz Baier, Emmeran Sollner, Peter Gleißner, Sebastian Randel, Ulrich Eismann, Emanuel Eichhammer, Imran Khan Continuous-variable quantum key distribution (CV-QKD) enables secure communication over standard telecom infrastructure, yet its scaling is stalled by bulky, discrete optical hardware. We address this bottleneck by demonstrating a real-time CV-QKD system driven by a chip-scale hybrid transmitter built from commercial telecom components. By integrating a micro-optic external-cavity laser with a monolithic photonic integrated IQ modulator, we provide high performance, enabling secret-key generation over 102 km of optical fiber, while reducing the size of the optics by 95%. Moreover, real-time operation overcomes the offline post-processing bottlenecks of experimental setups. This work bridges laboratory demonstrations and field-deployable technology, with a scalable architecture for cost-effective quantum networks. Comments: 14 pages, 7 figures, 2 tables Subjects: Quantum Physics (quant-ph); Optics (physics.optics) Cite as: arXiv:2603.13483 [quant-ph] (or arXiv:2603.13483v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2603.13483 Focus to learn more Submission history From: Igor Servello [view email] [v1] Fri, 13 Mar 2026 18:02:09 UTC (3,445 KB) Access Paper: view license Current browse context: quant-ph < prev | next > new | recent | 2026-03 Change to browse by: physics physics.optics References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation 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 Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)

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