Enhancing Long-distance Continuous-variable Quantum-key-distribution with an Error-correcting Relay
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911315632586752 |
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| author | Swain, S. Nibedita Marshman, Ryan J. Dias, Josephine Solntsev, Alexander S. Ralph, Timothy C. |
| author_facet | Swain, S. Nibedita Marshman, Ryan J. Dias, Josephine Solntsev, Alexander S. Ralph, Timothy C. |
| contents | Noiseless linear amplifiers (NLAs) serve as an effective means to enable long-distance continuous-variable (CV) quantum key distribution (QKD), even under realistic conditions with non-unit reconciliation efficiency. Separately, unitary averaging has been suggested to mitigate some stochastic noise, including phase noise in continuous-variable states. In this work, we combine these two protocols to simultaneously compensate for thermal-loss effects and suppress phase noise, thereby enabling long-distance CV QKD that surpasses the repeaterless bound, the fundamental rate-distance limit, for repeaterless quantum communication systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_11224 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhancing Long-distance Continuous-variable Quantum-key-distribution with an Error-correcting Relay Swain, S. Nibedita Marshman, Ryan J. Dias, Josephine Solntsev, Alexander S. Ralph, Timothy C. Quantum Physics Noiseless linear amplifiers (NLAs) serve as an effective means to enable long-distance continuous-variable (CV) quantum key distribution (QKD), even under realistic conditions with non-unit reconciliation efficiency. Separately, unitary averaging has been suggested to mitigate some stochastic noise, including phase noise in continuous-variable states. In this work, we combine these two protocols to simultaneously compensate for thermal-loss effects and suppress phase noise, thereby enabling long-distance CV QKD that surpasses the repeaterless bound, the fundamental rate-distance limit, for repeaterless quantum communication systems. |
| title | Enhancing Long-distance Continuous-variable Quantum-key-distribution with an Error-correcting Relay |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.11224 |