Security of decoy-state quantum key distribution with correlated bit-and-basis encoders
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866916004218535936 |
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| author | Currás-Lorenzo, Guillermo Pereira, Margarida Marcomini, Alessandro Tamaki, Kiyoshi Curty, Marcos |
| author_facet | Currás-Lorenzo, Guillermo Pereira, Margarida Marcomini, Alessandro Tamaki, Kiyoshi Curty, Marcos |
| contents | Practical quantum key distribution (QKD) modulators inevitably introduce correlations, causing the state emitted in a given round to depend on the setting choices made in previous rounds. These correlations break the round-by-round independence structure on which many widely used security proof techniques rely, leaving a significant gap between available theoretical guarantees and the reality of practical implementations. In this work, we develop a finite-key security proof for decoy-state BB84 against general coherent attacks that rigorously incorporates correlations introduced by Alice's bit-and-basis encoder, while requiring only partial characterization of such correlations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_11767 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Security of decoy-state quantum key distribution with correlated bit-and-basis encoders Currás-Lorenzo, Guillermo Pereira, Margarida Marcomini, Alessandro Tamaki, Kiyoshi Curty, Marcos Quantum Physics Practical quantum key distribution (QKD) modulators inevitably introduce correlations, causing the state emitted in a given round to depend on the setting choices made in previous rounds. These correlations break the round-by-round independence structure on which many widely used security proof techniques rely, leaving a significant gap between available theoretical guarantees and the reality of practical implementations. In this work, we develop a finite-key security proof for decoy-state BB84 against general coherent attacks that rigorously incorporates correlations introduced by Alice's bit-and-basis encoder, while requiring only partial characterization of such correlations. |
| title | Security of decoy-state quantum key distribution with correlated bit-and-basis encoders |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2605.11767 |