High-Rate Free-Space Continuous-Variable QKD with Self-Referenced Passive State Preparation
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866911654225117184 |
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| author | Yin, H. W. Liao, X. J. Xu, Y. H. Huang, P. Zhu, K. T. Wang, T. Zeng, G. H. |
| author_facet | Yin, H. W. Liao, X. J. Xu, Y. H. Huang, P. Zhu, K. T. Wang, T. Zeng, G. H. |
| contents | Continuous-variable quantum key distribution (CVQKD) using passive state preparation (PSP) offers low-cost, high-rate secure communication. However, the existing PSP-CVQKD scheme with a transmitted local oscillator has high photon leakage noise and poor stability, making it unsuitable for high-loss transmission. In this work, for the first time, we propose and implement a local local oscillator (LLO) CVQKD system using a self-referenced (SR) PSP scheme, and give a theoretical proof of the equivalence of the PSP and GMCS protocol using temporal-mode theory. By employing the novel self-referenced pilot scheme to achieve high-precision time-varying frequency and phase compensation algorithms, we significantly improve the system' s signal-to-noise ratio and stability. The system achieves a record-high asymptotic secret key rate of 10.34 Mbps over a free-space channel with up to 23.5 dB loss, while maintaining low excess noise and robust performance under turbulent conditions. This work establishes the feasibility of SR-LLO CVQKD, providing a practical pathway toward secure, high-rate quantum communication in realistic environments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_27299 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-Rate Free-Space Continuous-Variable QKD with Self-Referenced Passive State Preparation Yin, H. W. Liao, X. J. Xu, Y. H. Huang, P. Zhu, K. T. Wang, T. Zeng, G. H. Quantum Physics Optics Continuous-variable quantum key distribution (CVQKD) using passive state preparation (PSP) offers low-cost, high-rate secure communication. However, the existing PSP-CVQKD scheme with a transmitted local oscillator has high photon leakage noise and poor stability, making it unsuitable for high-loss transmission. In this work, for the first time, we propose and implement a local local oscillator (LLO) CVQKD system using a self-referenced (SR) PSP scheme, and give a theoretical proof of the equivalence of the PSP and GMCS protocol using temporal-mode theory. By employing the novel self-referenced pilot scheme to achieve high-precision time-varying frequency and phase compensation algorithms, we significantly improve the system' s signal-to-noise ratio and stability. The system achieves a record-high asymptotic secret key rate of 10.34 Mbps over a free-space channel with up to 23.5 dB loss, while maintaining low excess noise and robust performance under turbulent conditions. This work establishes the feasibility of SR-LLO CVQKD, providing a practical pathway toward secure, high-rate quantum communication in realistic environments. |
| title | High-Rate Free-Space Continuous-Variable QKD with Self-Referenced Passive State Preparation |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2604.27299 |