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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.12819 |
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| _version_ | 1866917338349043712 |
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| author | Zhou, Yang Zhou, Xing-Yu Wu, Shu-Fan Zeng, Qiang Yuan, Zhi-Liang Wang, Qin |
| author_facet | Zhou, Yang Zhou, Xing-Yu Wu, Shu-Fan Zeng, Qiang Yuan, Zhi-Liang Wang, Qin |
| contents | High-dimensional quantum key distribution (HD-QKD) offers a promising approach to enhance secret key rates beyond conventional binary-encoded QKD, addressing the growing demand for secure data transmission. However, the practical application of most HD-QKD systems has been hindered by their complexity, as they require the preparation and detection of quantum states in large Hilbert spaces. Here, we design and experimentally realize a directly modulated laser platform for HD-QKD. It operates at a repetition rate of 312.5 MHz, yielding a remarkably simple and scalable architecture. Through which, we achieve a record transmission distance of 250 km for HD-QKD, demonstrating its feasibility for long-distance quantum communication. Furthermore, we witness that the four-dimensional states outperform their two-dimensional counterpart in secret key rate, highlighting the practical advantage of high-dimensional encoding. This simple and scalable approach shows strong potential for chip-scale integration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_12819 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Directly Modulated Laser Platform for High-Dimensional Quantum Key Distribution Zhou, Yang Zhou, Xing-Yu Wu, Shu-Fan Zeng, Qiang Yuan, Zhi-Liang Wang, Qin Quantum Physics High-dimensional quantum key distribution (HD-QKD) offers a promising approach to enhance secret key rates beyond conventional binary-encoded QKD, addressing the growing demand for secure data transmission. However, the practical application of most HD-QKD systems has been hindered by their complexity, as they require the preparation and detection of quantum states in large Hilbert spaces. Here, we design and experimentally realize a directly modulated laser platform for HD-QKD. It operates at a repetition rate of 312.5 MHz, yielding a remarkably simple and scalable architecture. Through which, we achieve a record transmission distance of 250 km for HD-QKD, demonstrating its feasibility for long-distance quantum communication. Furthermore, we witness that the four-dimensional states outperform their two-dimensional counterpart in secret key rate, highlighting the practical advantage of high-dimensional encoding. This simple and scalable approach shows strong potential for chip-scale integration. |
| title | A Directly Modulated Laser Platform for High-Dimensional Quantum Key Distribution |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.12819 |