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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2504.09308 |
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| _version_ | 1866910910601232384 |
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| author | Hajomer, Adnan A. E. Bomhals, Axl Bruynsteen, CÉdric Sidhique, Aboobackkar Derkach, Ivan Andersen, Ulrik L. Yin, Xin Gehring, Tobias |
| author_facet | Hajomer, Adnan A. E. Bomhals, Axl Bruynsteen, CÉdric Sidhique, Aboobackkar Derkach, Ivan Andersen, Ulrik L. Yin, Xin Gehring, Tobias |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_09308 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chip-Based 16 GBaud Continuous-Variable Quantum Key Distribution Hajomer, Adnan A. E. Bomhals, Axl Bruynsteen, CÉdric Sidhique, Aboobackkar Derkach, Ivan Andersen, Ulrik L. Yin, Xin Gehring, Tobias Quantum Physics 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. |
| title | Chip-Based 16 GBaud Continuous-Variable Quantum Key Distribution |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2504.09308 |