Frequency-matching quantum key distribution
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908711111360512 |
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| author | Zhu, Hao-Tao Huang, Yizhi Rasmita, Abdullah Ding, Chao Cai, Xiangbin Zhang, Haoran Ma, Xiongfeng Gao, Weibo |
| author_facet | Zhu, Hao-Tao Huang, Yizhi Rasmita, Abdullah Ding, Chao Cai, Xiangbin Zhang, Haoran Ma, Xiongfeng Gao, Weibo |
| contents | Quantum key distribution (QKD) enables information-theoretically secure communication against eavesdropping. However, phase instability remains a challenge across many QKD applications, particularly in schemes such as twin-field QKD and measurement-device-independent QKD. The most dominant source of phase fluctuation arises from the frequency offset between independent lasers. Here we propose a method to address this issue by employing a classical photodiode to compensate for the laser frequency difference. As an application of this method, we implement this technique in a mode-pairing QKD system, achieving an error rate approaching the theoretical limit and surpassing the linear key-rate bound over a fiber distance of 296.8 km. This approach provides a practical solution for frequency matching between independent lasers and can be extended to other fields requiring precise phase stabilization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_05496 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Frequency-matching quantum key distribution Zhu, Hao-Tao Huang, Yizhi Rasmita, Abdullah Ding, Chao Cai, Xiangbin Zhang, Haoran Ma, Xiongfeng Gao, Weibo Quantum Physics Quantum key distribution (QKD) enables information-theoretically secure communication against eavesdropping. However, phase instability remains a challenge across many QKD applications, particularly in schemes such as twin-field QKD and measurement-device-independent QKD. The most dominant source of phase fluctuation arises from the frequency offset between independent lasers. Here we propose a method to address this issue by employing a classical photodiode to compensate for the laser frequency difference. As an application of this method, we implement this technique in a mode-pairing QKD system, achieving an error rate approaching the theoretical limit and surpassing the linear key-rate bound over a fiber distance of 296.8 km. This approach provides a practical solution for frequency matching between independent lasers and can be extended to other fields requiring precise phase stabilization. |
| title | Frequency-matching quantum key distribution |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.05496 |