Surpassing the currently achievable distance of quantum key distribution based on sending-or-not-sending approach
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arXiv
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914303912706048 |
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| author | Bebrov, Georgi |
| author_facet | Bebrov, Georgi |
| contents | Protocols based on the sending-or-not-sending (SNS) principle have been intensively studied in recent years and have been shown to enable the longest transmission distances in quantum key distribution (QKD). In this work, we propose a sending-or-not-sending phase-matching QKD protocol (SNS-PM-QKD) that improves tolerance to phase mismatch, thereby extending the achievable transmission distance. We present a security analysis of SNS-PM-QKD in the asymptotic (infinite-key) regime under collective attacks. The performance of the proposed protocol is compared with that of standard phase-matching QKD, theoretical SNS-type twin-field QKD protocols (SNS-TF-QKD), and an experimental SNS-TF-QKD operated over transmission distances of up to 1002km. Our results show that SNS-PM-QKD achieves greater transmission distances than these existing protocols, highlighting its potential for long-distance quantum communication. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_03173 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Surpassing the currently achievable distance of quantum key distribution based on sending-or-not-sending approach Bebrov, Georgi Quantum Physics 81P94 (Primary) 81P45, 94B05 (Secondary) E.3; E.4 Protocols based on the sending-or-not-sending (SNS) principle have been intensively studied in recent years and have been shown to enable the longest transmission distances in quantum key distribution (QKD). In this work, we propose a sending-or-not-sending phase-matching QKD protocol (SNS-PM-QKD) that improves tolerance to phase mismatch, thereby extending the achievable transmission distance. We present a security analysis of SNS-PM-QKD in the asymptotic (infinite-key) regime under collective attacks. The performance of the proposed protocol is compared with that of standard phase-matching QKD, theoretical SNS-type twin-field QKD protocols (SNS-TF-QKD), and an experimental SNS-TF-QKD operated over transmission distances of up to 1002km. Our results show that SNS-PM-QKD achieves greater transmission distances than these existing protocols, highlighting its potential for long-distance quantum communication. |
| title | Surpassing the currently achievable distance of quantum key distribution based on sending-or-not-sending approach |
| topic | Quantum Physics 81P94 (Primary) 81P45, 94B05 (Secondary) E.3; E.4 |
| url | https://arxiv.org/abs/2602.03173 |