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

• URL: http://arxiv.org/abs/2603.13483v1
• Date: Fri, 13 Mar 2026 18:02:09 GMT
• Title: A Chip-Scale Transmitter Module for Real-Time Continuous-Variable QKD
• Abstract summary: Continuous-variable quantum key distribution (CV-QKD) enables secure communication over standard telecom infrastructure.<n>We demonstrate a real-time CV-QKD system driven by a chip-scale hybrid transmitter built from commercial telecom components.
• Score: 0.203824256419424
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 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.

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