Chip-Based 16 GBaud Continuous-Variable Quantum Key Distribution

• URL: http://arxiv.org/abs/2504.09308v1
• Date: Sat, 12 Apr 2025 18:55:52 GMT
• Title: Chip-Based 16 GBaud Continuous-Variable Quantum Key Distribution
• Authors: Adnan A. E. Hajomer, Axl Bomhals, CÉdric Bruynsteen, Aboobackkar Sidhique, Ivan Derkach, Ulrik L. Andersen, Xin Yin, Tobias Gehring,
• Abstract summary: We demonstrate the first fully photonic-integrated continuous-variable QKD (CVQKD) system operating at a classical telecom symbol rate of 16 GBaud.<n>Our system achieves the highest reported secure key rate to date, reaching 0.289 Gb/s and 0.246 Gb/s over a 20 km fiber link.<n>These results establish a record key rate and represent a critical step toward scalable, cost-effective, and mass-deployable quantum-secure communication.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum key distribution (QKD) stands as the most successful application of quantum information science, providing information-theoretic security for key exchange. While it has evolved from proof-of-concept experiments to commercial products, widespread adoption requires chip-based integration to reduce costs, enable mass production, facilitate miniaturization, and enhance system performance. Here, we demonstrate the first fully photonic-integrated continuous-variable QKD (CVQKD) system operating at a classical telecom symbol rate of 16 GBaud. Our system integrates a silicon photonic transmitter circuit (excluding the laser source) and a 20 GHz photonic-electronic receiver, which features a phase-diverse silicon photonic integrated circuit and custom-designed GaAs pHEMT transimpedance amplifiers. Advanced digital signal processing allows our system to achieve the highest reported secure key rate to date, reaching 0.289 Gb/s and 0.246 Gb/s over a 20 km fiber link in the asymptotic and finite-size regimes, respectively. These results establish a record key rate and represent a critical step toward scalable, cost-effective, and mass-deployable quantum-secure communication using photonic-integrated CVQKD systems.

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