A Chip-Scale Transmitter Module for Real-Time Continuous-Variable QKD
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866911514656505856 |
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| author | Servello, Igor Hauer, Martin Baier, Moritz Sollner, Emmeran Gleißner, Peter Randel, Sebastian Eismann, Ulrich Eichhammer, Emanuel Khan, Imran |
| author_facet | Servello, Igor Hauer, Martin Baier, Moritz Sollner, Emmeran Gleißner, Peter Randel, Sebastian Eismann, Ulrich Eichhammer, Emanuel Khan, Imran |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_13483 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Chip-Scale Transmitter Module for Real-Time Continuous-Variable QKD Servello, Igor Hauer, Martin Baier, Moritz Sollner, Emmeran Gleißner, Peter Randel, Sebastian Eismann, Ulrich Eichhammer, Emanuel Khan, Imran Quantum Physics Optics 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. |
| title | A Chip-Scale Transmitter Module for Real-Time Continuous-Variable QKD |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2603.13483 |