Continuous-variable quantum key distribution with on-chip light sources

Integrated quantum key distribution (QKD) systems based on photonic chips have high scalability and stability, and are promising for further construction of global quantum communications networks. On-chip quantum light sources are a critical component of a fully integrated QKD system; especially a c...

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Veröffentlicht in:Photonics research (Washington, DC) DC), 2023-04, Vol.11 (4), p.504
Hauptverfasser: Li, Lang, Wang, Tao, Li, Xinhang, Huang, Peng, Guo, Yuyao, Lu, Liangjun, Zhou, Linjie, Zeng, Guihua
Format: Artikel
Sprache:eng
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Zusammenfassung:Integrated quantum key distribution (QKD) systems based on photonic chips have high scalability and stability, and are promising for further construction of global quantum communications networks. On-chip quantum light sources are a critical component of a fully integrated QKD system; especially a continuous-variable QKD (CV-QKD) system based on coherent detection, which has extremely high requirements for the light sources. Here, for what we believe is the first time, we designed and fabricated two on-chip tunable lasers for CV-QKD, and demonstrated a high-performance system based on these sources. Because of the high output power, fine tunability, and narrow linewidth, the involved on-chip lasers guarantee the accurate shot-noise-limited detection of quantum signals, center wavelength alignment of nonhomologous lasers, and suppression of untrusted excess noise. The system’s secret key rate can reach 0.75 Mb/s at a 50 km fiber distance, and the secure transmission distance can exceed 100 km. Our results mark a breakthrough toward building a fully integrated CV-QKD, and pave the way for a reliable and efficient terrestrial quantum-secure metropolitan area network.
ISSN:2327-9125
2327-9125
DOI:10.1364/PRJ.473328