A Bipartite Quantum Key Distribution Protocol Based on Indefinite Causal Order
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866917324543492096 |
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| author | Leśniak, Mateusz Kukulski, Ryszard Lewandowska, Paulina Rajchel-Mieldzioć, Grzegorz Wroński, Michał |
| author_facet | Leśniak, Mateusz Kukulski, Ryszard Lewandowska, Paulina Rajchel-Mieldzioć, Grzegorz Wroński, Michał |
| contents | We propose a bipartite quantum key distribution (QKD) protocol based on causal nonseparability: the presence of a resource -- a process matrix -- that does not correspond to any definite causal order between two parties. In our protocol, Alice and Bob perform local operations arranged in a ``causal-order guessing game,'' whereby each round yields an 85.35\% probability of matching bits when the communication is undisturbed. This raw matching probability (or equivalently, a $\sim14.65\%$ error rate) is amenable to standard forward error-correction strategies. We further discuss the practical construction of the QKD protocol using indefinite causal order, where several different scenarios are deeply analyzed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_08204 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Bipartite Quantum Key Distribution Protocol Based on Indefinite Causal Order Leśniak, Mateusz Kukulski, Ryszard Lewandowska, Paulina Rajchel-Mieldzioć, Grzegorz Wroński, Michał Quantum Physics Cryptography and Security We propose a bipartite quantum key distribution (QKD) protocol based on causal nonseparability: the presence of a resource -- a process matrix -- that does not correspond to any definite causal order between two parties. In our protocol, Alice and Bob perform local operations arranged in a ``causal-order guessing game,'' whereby each round yields an 85.35\% probability of matching bits when the communication is undisturbed. This raw matching probability (or equivalently, a $\sim14.65\%$ error rate) is amenable to standard forward error-correction strategies. We further discuss the practical construction of the QKD protocol using indefinite causal order, where several different scenarios are deeply analyzed. |
| title | A Bipartite Quantum Key Distribution Protocol Based on Indefinite Causal Order |
| topic | Quantum Physics Cryptography and Security |
| url | https://arxiv.org/abs/2603.08204 |