Fast qubit-based frequency recovery algorithm for 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_ | 1866912599546789888 |
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| author | Lu, Feng-Yu Huang, Zheng-Kai Deng, Jia-Jv Zhang, Chi Wang, Shuang He, De-Yong Yin, Zhen-Qiang Chen, Wei Guo, Guang-Can Han, Zheng-Fu |
| author_facet | Lu, Feng-Yu Huang, Zheng-Kai Deng, Jia-Jv Zhang, Chi Wang, Shuang He, De-Yong Yin, Zhen-Qiang Chen, Wei Guo, Guang-Can Han, Zheng-Fu |
| contents | Clock synchronization serves as a foundational subsystem in quantum key distribution (QKD). The recently proposed Qubit-based synchronization (Qubit4Sync) has opportunities in eliminating additional cost, noise, and potential side channels. It offers a promising alternative to dedicated synchronization hardware. However, the current frequency recovery process in Qubit4Sync requires high data throughput and computational speed, limiting practical use. To overcome these issues, we developed a fast frequency recovery algorithm that increases the recovery rate by orders of magnitude and remains robust under bad signal-to-noise ratio (SNR). This enables Qubit4Sync to operate effectively in mainstream gated-mode QKD systems. We further establish a theoretical model for frequency recovery, showing that our algorithm is robust against disturbances like dead time, jitter, and afterpulse. A frequency-domain SNR calculation method is also provided to guide parameter design for specific experimental conditions. This work opens the door to practical Qubit4Sync deployment in general QKD systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_17849 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fast qubit-based frequency recovery algorithm for quantum key distribution Lu, Feng-Yu Huang, Zheng-Kai Deng, Jia-Jv Zhang, Chi Wang, Shuang He, De-Yong Yin, Zhen-Qiang Chen, Wei Guo, Guang-Can Han, Zheng-Fu Quantum Physics Clock synchronization serves as a foundational subsystem in quantum key distribution (QKD). The recently proposed Qubit-based synchronization (Qubit4Sync) has opportunities in eliminating additional cost, noise, and potential side channels. It offers a promising alternative to dedicated synchronization hardware. However, the current frequency recovery process in Qubit4Sync requires high data throughput and computational speed, limiting practical use. To overcome these issues, we developed a fast frequency recovery algorithm that increases the recovery rate by orders of magnitude and remains robust under bad signal-to-noise ratio (SNR). This enables Qubit4Sync to operate effectively in mainstream gated-mode QKD systems. We further establish a theoretical model for frequency recovery, showing that our algorithm is robust against disturbances like dead time, jitter, and afterpulse. A frequency-domain SNR calculation method is also provided to guide parameter design for specific experimental conditions. This work opens the door to practical Qubit4Sync deployment in general QKD systems. |
| title | Fast qubit-based frequency recovery algorithm for quantum key distribution |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2509.17849 |