Post-Measurement Pairing Quantum Key Distribution with Local Optical Frequency Standard
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866914879693127680 |
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| author | Ge, Chengfang Zhou, Lai Lin, Jinping Yin, Hua-Lei Zeng, Qiang Yuan, Zhiliang |
| author_facet | Ge, Chengfang Zhou, Lai Lin, Jinping Yin, Hua-Lei Zeng, Qiang Yuan, Zhiliang |
| contents | The idea of post-measurement coincidence pairing simplifies substantially long-distance, repeater-like quantum key distribution (QKD) by eliminating the need for tracking the differential phase of the users' lasers. However, optical frequency tracking remains necessary and can become a severe burden in future deployment of multi-node quantum networks. Here, we resolve this problem by referencing each user's laser to an absolute frequency standard and demonstrate a practical post-measurement pairing QKD with excellent long-term stability. We confirm the setup's repeater-like behavior and achieve a finite-size secure key rate (SKR) of 15.94 bit/s over 504 km fiber, which overcomes the absolute repeaterless bound by 1.28 times. Over a fiber length 100 km, the setup delivers an impressive SKR of 285.68 kbit/s. Our work paves the way towards an efficient muti-user quantum network with the local frequency standard. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_14771 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Post-Measurement Pairing Quantum Key Distribution with Local Optical Frequency Standard Ge, Chengfang Zhou, Lai Lin, Jinping Yin, Hua-Lei Zeng, Qiang Yuan, Zhiliang Quantum Physics Optics The idea of post-measurement coincidence pairing simplifies substantially long-distance, repeater-like quantum key distribution (QKD) by eliminating the need for tracking the differential phase of the users' lasers. However, optical frequency tracking remains necessary and can become a severe burden in future deployment of multi-node quantum networks. Here, we resolve this problem by referencing each user's laser to an absolute frequency standard and demonstrate a practical post-measurement pairing QKD with excellent long-term stability. We confirm the setup's repeater-like behavior and achieve a finite-size secure key rate (SKR) of 15.94 bit/s over 504 km fiber, which overcomes the absolute repeaterless bound by 1.28 times. Over a fiber length 100 km, the setup delivers an impressive SKR of 285.68 kbit/s. Our work paves the way towards an efficient muti-user quantum network with the local frequency standard. |
| title | Post-Measurement Pairing Quantum Key Distribution with Local Optical Frequency Standard |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2407.14771 |