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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2412.16782 |
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| _version_ | 1866916884556808192 |
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| author | Ogrodnik, Maciej Widomski, Adam Bruß, Dagmar Chesi, Giovanni Grasselli, Federico Kampermann, Hermann Macchiavello, Chiara Walk, Nathan Wyderka, Nikolai Karpiński, Michał |
| author_facet | Ogrodnik, Maciej Widomski, Adam Bruß, Dagmar Chesi, Giovanni Grasselli, Federico Kampermann, Hermann Macchiavello, Chiara Walk, Nathan Wyderka, Nikolai Karpiński, Michał |
| contents | While quantum key distribution (QKD) based on two-dimensional (qubit) encoding is a mature, field-tested technology, its performance is lacking for many cryptographic applications. High-dimensional encoding for QKD enables increased achievable key rates and robustness as compared to the standard qubit-based systems. However, experimental implementations of such systems are more complicated, expensive, and require careful security analysis as they are less common. In this work we present a proof of principle high-dimensional time-phase BB84 QKD experiment using only one single-photon detector per measurement basis. We employ the temporal Talbot effect to detect QKD symbols in the control basis, and show experimentally-obtained simplistic key rates for the two-dimensional and four-dimensional case, including in an urban fiber network. We present a comparison of a simplistic secret key rate obtained from a standard security proof with the one derived from a recently devised proof using a tunable beam splitter to display security issues stemming from asymmetric detection efficiencies in the two bases. Our results contribute to the discussion of the benefits of high-dimensional encoding and highlight the impact of security analysis on the achievable QKD performance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_16782 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High-dimensional quantum key distribution with resource-efficient detection Ogrodnik, Maciej Widomski, Adam Bruß, Dagmar Chesi, Giovanni Grasselli, Federico Kampermann, Hermann Macchiavello, Chiara Walk, Nathan Wyderka, Nikolai Karpiński, Michał Quantum Physics While quantum key distribution (QKD) based on two-dimensional (qubit) encoding is a mature, field-tested technology, its performance is lacking for many cryptographic applications. High-dimensional encoding for QKD enables increased achievable key rates and robustness as compared to the standard qubit-based systems. However, experimental implementations of such systems are more complicated, expensive, and require careful security analysis as they are less common. In this work we present a proof of principle high-dimensional time-phase BB84 QKD experiment using only one single-photon detector per measurement basis. We employ the temporal Talbot effect to detect QKD symbols in the control basis, and show experimentally-obtained simplistic key rates for the two-dimensional and four-dimensional case, including in an urban fiber network. We present a comparison of a simplistic secret key rate obtained from a standard security proof with the one derived from a recently devised proof using a tunable beam splitter to display security issues stemming from asymmetric detection efficiencies in the two bases. Our results contribute to the discussion of the benefits of high-dimensional encoding and highlight the impact of security analysis on the achievable QKD performance. |
| title | High-dimensional quantum key distribution with resource-efficient detection |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2412.16782 |