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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2511.06488 |
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| _version_ | 1866914144448413696 |
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| author | Banik, Animesh Khan, Md. Shihab Khan, Rafid Masrur Shubha, Syed Emad Uddin Nizam, Quazi Muhammad Rashed |
| author_facet | Banik, Animesh Khan, Md. Shihab Khan, Rafid Masrur Shubha, Syed Emad Uddin Nizam, Quazi Muhammad Rashed |
| contents | We introduce a tunable framework for generalized quantum state discrimination (GSD) and apply it to quantum key distribution (QKD) through a protocol we call phiQKD. Building upon the two-state B92 protocol, phiQKD replaces the traditional unambiguous state discrimination (IDP) measurement with a one-parameter family of hybrid POVMs characterized by a tilting angle $ϕ$. This allows for continuous control over the trade-off among correct, incorrect, and inconclusive outcomes. While the asymptotic key rate improvement over B92 is modest, phiQKD offers a practical advantage by enabling adaptability to noise and channel imperfections via measurement tunability. By evaluating the protocol under asymptotic, finite-key, and composable security models, we show that, treating quantum measurement as a tunable design parameter, rather than a fixed operation, enables flexible protocol optimization and improved performance under realistic constraints. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06488 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generalized State Discrimination for Tunable Quantum Key Distribution: The phiQKD Protocol Banik, Animesh Khan, Md. Shihab Khan, Rafid Masrur Shubha, Syed Emad Uddin Nizam, Quazi Muhammad Rashed Quantum Physics We introduce a tunable framework for generalized quantum state discrimination (GSD) and apply it to quantum key distribution (QKD) through a protocol we call phiQKD. Building upon the two-state B92 protocol, phiQKD replaces the traditional unambiguous state discrimination (IDP) measurement with a one-parameter family of hybrid POVMs characterized by a tilting angle $ϕ$. This allows for continuous control over the trade-off among correct, incorrect, and inconclusive outcomes. While the asymptotic key rate improvement over B92 is modest, phiQKD offers a practical advantage by enabling adaptability to noise and channel imperfections via measurement tunability. By evaluating the protocol under asymptotic, finite-key, and composable security models, we show that, treating quantum measurement as a tunable design parameter, rather than a fixed operation, enables flexible protocol optimization and improved performance under realistic constraints. |
| title | Generalized State Discrimination for Tunable Quantum Key Distribution: The phiQKD Protocol |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2511.06488 |